Read the weekly change series of a ZIP
curl --request GET \
--url https://api.investorlift.com/v1/markets/{market}/changes \
--header 'Authorization: Bearer <token>'const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};
fetch('https://api.investorlift.com/v1/markets/{market}/changes', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.investorlift.com/v1/markets/{market}/changes"
headers = {"Authorization": "Bearer <token>"}
response = requests.get(url, headers=headers)
print(response.text){
"data": {
"market": "phx",
"zip": "85251",
"first_week": "2025-10-02",
"last_week": "2026-09-09",
"weeks_applied": 52,
"weeks": [
{
"week": "2025-10-02",
"file_kind": "DELTA",
"parcels_observed": 13920,
"n_events": 3244,
"metrics": {
"owner_changes": 280,
"listings": 0,
"relists": 19,
"price_cuts": 14,
"price_rises": 2,
"solds": 17,
"delists": 10,
"vacancy_onsets": 6,
"vacancy_cleared": 6,
"delinquency_onsets": 4,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 678,
"structure_changes": 38,
"portfolio_changes": 1088,
"avm_change_median_pct": -1.36,
"permits_issued": 6
}
},
{
"week": "2025-10-09",
"file_kind": "DELTA",
"parcels_observed": 7432,
"n_events": 1195,
"metrics": {
"owner_changes": 26,
"listings": 0,
"relists": 14,
"price_cuts": 5,
"price_rises": 1,
"solds": 14,
"delists": 12,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 203,
"structure_changes": 12,
"portfolio_changes": 679,
"avm_change_median_pct": -0.1,
"permits_issued": 6
}
},
{
"week": "2025-10-16",
"file_kind": "DELTA",
"parcels_observed": 8556,
"n_events": 1351,
"metrics": {
"owner_changes": 45,
"listings": 0,
"relists": 8,
"price_cuts": 30,
"price_rises": 5,
"solds": 54,
"delists": 37,
"vacancy_onsets": 0,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 1,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 424,
"structure_changes": 5,
"portfolio_changes": 517,
"avm_change_median_pct": 0.97,
"permits_issued": 8
}
},
{
"week": "2025-10-23",
"file_kind": "DELTA",
"parcels_observed": 7046,
"n_events": 1311,
"metrics": {
"owner_changes": 25,
"listings": 0,
"relists": 14,
"price_cuts": 12,
"price_rises": 1,
"solds": 18,
"delists": 16,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 68,
"structure_changes": 3,
"portfolio_changes": 1048,
"avm_change_median_pct": -0.14,
"permits_issued": 5
}
},
{
"week": "2025-10-30",
"file_kind": "DELTA",
"parcels_observed": 6899,
"n_events": 728,
"metrics": {
"owner_changes": 24,
"listings": 0,
"relists": 9,
"price_cuts": 15,
"price_rises": 1,
"solds": 10,
"delists": 5,
"vacancy_onsets": 1,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 75,
"structure_changes": 1,
"portfolio_changes": 504,
"avm_change_median_pct": 0,
"permits_issued": 11
}
},
{
"week": "2025-11-06",
"file_kind": "DELTA",
"parcels_observed": 18631,
"n_events": 25617,
"metrics": {
"owner_changes": 455,
"listings": 0,
"relists": 170,
"price_cuts": 9,
"price_rises": 15,
"solds": 21,
"delists": 11,
"vacancy_onsets": 1,
"vacancy_cleared": 5,
"delinquency_onsets": 190,
"delinquency_cured": 1068,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 2757,
"structure_changes": 52,
"portfolio_changes": 2860,
"avm_change_median_pct": -1.44,
"permits_issued": 7
}
},
{
"week": "2025-11-13",
"file_kind": "DELTA",
"parcels_observed": 7251,
"n_events": 1387,
"metrics": {
"owner_changes": 10,
"listings": 0,
"relists": 22,
"price_cuts": 3,
"price_rises": 0,
"solds": 13,
"delists": 8,
"vacancy_onsets": 0,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 247,
"structure_changes": 12,
"portfolio_changes": 1027,
"avm_change_median_pct": -0.15,
"permits_issued": 24
}
},
{
"week": "2025-11-20",
"file_kind": "DELTA",
"parcels_observed": 7665,
"n_events": 1077,
"metrics": {
"owner_changes": 57,
"listings": 0,
"relists": 16,
"price_cuts": 7,
"price_rises": 1,
"solds": 4,
"delists": 6,
"vacancy_onsets": 1,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 257,
"structure_changes": 8,
"portfolio_changes": 601,
"avm_change_median_pct": 0,
"permits_issued": 11
}
},
{
"week": "2025-11-21",
"file_kind": "FULL",
"parcels_observed": 18758,
"n_events": 493,
"metrics": {
"owner_changes": 22,
"listings": 0,
"relists": 5,
"price_cuts": 3,
"price_rises": 0,
"solds": 4,
"delists": 0,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 70,
"structure_changes": 0,
"portfolio_changes": 346,
"avm_change_median_pct": 0,
"permits_issued": 11
}
},
{
"week": "2025-11-27",
"file_kind": "FULL",
"parcels_observed": 18758,
"n_events": 285,
"metrics": {
"owner_changes": 0,
"listings": 0,
"relists": 10,
"price_cuts": 3,
"price_rises": 1,
"solds": 14,
"delists": 4,
"vacancy_onsets": 1,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 79,
"structure_changes": 4,
"portfolio_changes": 157,
"avm_change_median_pct": 0,
"permits_issued": 4
}
},
{
"week": "2025-12-02",
"file_kind": "FULL",
"parcels_observed": 18758,
"n_events": 1332,
"metrics": {
"owner_changes": 28,
"listings": 0,
"relists": 12,
"price_cuts": 46,
"price_rises": 0,
"solds": 38,
"delists": 147,
"vacancy_onsets": 3,
"vacancy_cleared": 2,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 260,
"structure_changes": 4,
"portfolio_changes": 598,
"avm_change_median_pct": -0.66,
"permits_issued": 3
}
},
{
"week": "2025-12-04",
"file_kind": "DELTA",
"parcels_observed": 915,
"n_events": 3,
"metrics": {
"owner_changes": 0,
"listings": 0,
"relists": 0,
"price_cuts": 0,
"price_rises": 0,
"solds": 1,
"delists": 1,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 1,
"structure_changes": 0,
"portfolio_changes": 0,
"avm_change_median_pct": 4.52,
"permits_issued": 5
}
},
{
"week": "2025-12-11",
"file_kind": "DELTA",
"parcels_observed": 18289,
"n_events": 43419,
"metrics": {
"owner_changes": 50,
"listings": 0,
"relists": 61,
"price_cuts": 20,
"price_rises": 2,
"solds": 14,
"delists": 172,
"vacancy_onsets": 122,
"vacancy_cleared": 72,
"delinquency_onsets": 3,
"delinquency_cured": 1,
"new_mortgages": 2269,
"lien_releases": 21,
"involuntary_liens": 89,
"assessment_changes": 16450,
"avm_changes": 16082,
"structure_changes": 2030,
"portfolio_changes": 4673,
"avm_change_median_pct": -0.91,
"permits_issued": 8
}
},
{
"week": "2025-12-18",
"file_kind": "DELTA",
"parcels_observed": 10360,
"n_events": 9244,
"metrics": {
"owner_changes": 69,
"listings": 0,
"relists": 30,
"price_cuts": 6,
"price_rises": 0,
"solds": 13,
"delists": 21,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 68,
"lien_releases": 1829,
"involuntary_liens": 4,
"assessment_changes": 0,
"avm_changes": 2886,
"structure_changes": 5,
"portfolio_changes": 3869,
"avm_change_median_pct": -0.21,
"permits_issued": 10
}
},
{
"week": "2025-12-25",
"file_kind": "DELTA",
"parcels_observed": 18385,
"n_events": 1793,
"metrics": {
"owner_changes": 32,
"listings": 0,
"relists": 38,
"price_cuts": 8,
"price_rises": 0,
"solds": 16,
"delists": 32,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 6,
"lien_releases": 13,
"involuntary_liens": 32,
"assessment_changes": 0,
"avm_changes": 284,
"structure_changes": 5,
"portfolio_changes": 1159,
"avm_change_median_pct": 0,
"permits_issued": 2
}
},
{
"week": "2026-01-01",
"file_kind": "DELTA",
"parcels_observed": 8863,
"n_events": 2573,
"metrics": {
"owner_changes": 41,
"listings": 0,
"relists": 180,
"price_cuts": 6,
"price_rises": 1,
"solds": 14,
"delists": 20,
"vacancy_onsets": 0,
"vacancy_cleared": 4,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 28,
"lien_releases": 14,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 460,
"structure_changes": 0,
"portfolio_changes": 1319,
"avm_change_median_pct": 0,
"permits_issued": 2
}
},
{
"week": "2026-01-08",
"file_kind": "DELTA",
"parcels_observed": 7582,
"n_events": 2064,
"metrics": {
"owner_changes": 32,
"listings": 0,
"relists": 19,
"price_cuts": 12,
"price_rises": 0,
"solds": 21,
"delists": 36,
"vacancy_onsets": 5,
"vacancy_cleared": 4,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 45,
"lien_releases": 45,
"involuntary_liens": 8,
"assessment_changes": 0,
"avm_changes": 360,
"structure_changes": 3,
"portfolio_changes": 1325,
"avm_change_median_pct": -0.05,
"permits_issued": 4
}
},
{
"week": "2026-01-15",
"file_kind": "DELTA",
"parcels_observed": 6857,
"n_events": 1267,
"metrics": {
"owner_changes": 28,
"listings": 0,
"relists": 43,
"price_cuts": 13,
"price_rises": 1,
"solds": 24,
"delists": 41,
"vacancy_onsets": 1,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 6,
"lien_releases": 9,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 179,
"structure_changes": 9,
"portfolio_changes": 785,
"avm_change_median_pct": -0.17,
"permits_issued": 3
}
},
{
"week": "2026-01-21",
"file_kind": "FULL",
"parcels_observed": 18772,
"n_events": 17567,
"metrics": {
"owner_changes": 57,
"listings": 0,
"relists": 35,
"price_cuts": 19,
"price_rises": 0,
"solds": 13,
"delists": 30,
"vacancy_onsets": 45,
"vacancy_cleared": 131,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 34,
"lien_releases": 19,
"involuntary_liens": 22,
"assessment_changes": 0,
"avm_changes": 16038,
"structure_changes": 4,
"portfolio_changes": 801,
"avm_change_median_pct": -0.7,
"permits_issued": 3
}
},
{
"week": "2026-02-05",
"file_kind": "DELTA",
"parcels_observed": 12950,
"n_events": 2629,
"metrics": {
"owner_changes": 84,
"listings": 0,
"relists": 75,
"price_cuts": 51,
"price_rises": 3,
"solds": 23,
"delists": 50,
"vacancy_onsets": 8,
"vacancy_cleared": 6,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 44,
"lien_releases": 20,
"involuntary_liens": 2,
"assessment_changes": 0,
"avm_changes": 455,
"structure_changes": 7,
"portfolio_changes": 1485,
"avm_change_median_pct": -0.22,
"permits_issued": 14
}
},
{
"week": "2026-02-12",
"file_kind": "DELTA",
"parcels_observed": 6228,
"n_events": 510,
"metrics": {
"owner_changes": 0,
"listings": 0,
"relists": 47,
"price_cuts": 32,
"price_rises": 0,
"solds": 15,
"delists": 21,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 19,
"lien_releases": 4,
"involuntary_liens": 2,
"assessment_changes": 0,
"avm_changes": 206,
"structure_changes": 4,
"portfolio_changes": 118,
"avm_change_median_pct": -0.3,
"permits_issued": 7
}
},
{
"week": "2026-02-19",
"file_kind": "DELTA",
"parcels_observed": 7633,
"n_events": 1637,
"metrics": {
"owner_changes": 37,
"listings": 0,
"relists": 26,
"price_cuts": 26,
"price_rises": 0,
"solds": 9,
"delists": 22,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 31,
"lien_releases": 4,
"involuntary_liens": 1,
"assessment_changes": 0,
"avm_changes": 270,
"structure_changes": 2,
"portfolio_changes": 1099,
"avm_change_median_pct": -0.2,
"permits_issued": 2
}
},
{
"week": "2026-02-26",
"file_kind": "DELTA",
"parcels_observed": 9337,
"n_events": 1526,
"metrics": {
"owner_changes": 28,
"listings": 0,
"relists": 46,
"price_cuts": 41,
"price_rises": 2,
"solds": 14,
"delists": 29,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 15,
"lien_releases": 3,
"involuntary_liens": 1,
"assessment_changes": 0,
"avm_changes": 198,
"structure_changes": 5,
"portfolio_changes": 348,
"avm_change_median_pct": -0.68,
"permits_issued": 3
}
},
{
"week": "2026-03-05",
"file_kind": "DELTA",
"parcels_observed": 9832,
"n_events": 1023,
"metrics": {
"owner_changes": 36,
"listings": 0,
"relists": 39,
"price_cuts": 33,
"price_rises": 1,
"solds": 13,
"delists": 21,
"vacancy_onsets": 0,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 25,
"lien_releases": 3,
"involuntary_liens": 1,
"assessment_changes": 0,
"avm_changes": 307,
"structure_changes": 5,
"portfolio_changes": 464,
"avm_change_median_pct": 0.01,
"permits_issued": 6
}
},
{
"week": "2026-03-12",
"file_kind": "DELTA",
"parcels_observed": 6936,
"n_events": 1633,
"metrics": {
"owner_changes": 35,
"listings": 0,
"relists": 33,
"price_cuts": 40,
"price_rises": 2,
"solds": 13,
"delists": 26,
"vacancy_onsets": 5,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 20,
"lien_releases": 10,
"involuntary_liens": 2,
"assessment_changes": 0,
"avm_changes": 239,
"structure_changes": 4,
"portfolio_changes": 1114,
"avm_change_median_pct": -0.28,
"permits_issued": 4
}
},
{
"week": "2026-03-19",
"file_kind": "DELTA",
"parcels_observed": 8726,
"n_events": 1526,
"metrics": {
"owner_changes": 36,
"listings": 0,
"relists": 30,
"price_cuts": 41,
"price_rises": 1,
"solds": 12,
"delists": 18,
"vacancy_onsets": 5,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 23,
"lien_releases": 8,
"involuntary_liens": 2,
"assessment_changes": 0,
"avm_changes": 748,
"structure_changes": 4,
"portfolio_changes": 491,
"avm_change_median_pct": -2.02,
"permits_issued": 6
}
},
{
"week": "2026-03-26",
"file_kind": "DELTA",
"parcels_observed": 8284,
"n_events": 1418,
"metrics": {
"owner_changes": 30,
"listings": 0,
"relists": 40,
"price_cuts": 41,
"price_rises": 1,
"solds": 17,
"delists": 25,
"vacancy_onsets": 1,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 18,
"lien_releases": 42,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 468,
"structure_changes": 4,
"portfolio_changes": 631,
"avm_change_median_pct": 0,
"permits_issued": 2
}
},
{
"week": "2026-04-02",
"file_kind": "DELTA",
"parcels_observed": 18647,
"n_events": 19230,
"metrics": {
"owner_changes": 58,
"listings": 0,
"relists": 24,
"price_cuts": 53,
"price_rises": 1,
"solds": 17,
"delists": 14,
"vacancy_onsets": 185,
"vacancy_cleared": 111,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 46,
"lien_releases": 48,
"involuntary_liens": 94,
"assessment_changes": 0,
"avm_changes": 17357,
"structure_changes": 108,
"portfolio_changes": 743,
"avm_change_median_pct": 0.29,
"permits_issued": 1
}
},
{
"week": "2026-04-07",
"file_kind": "FULL",
"parcels_observed": 18775,
"n_events": 1734,
"metrics": {
"owner_changes": 44,
"listings": 0,
"relists": 16,
"price_cuts": 22,
"price_rises": 0,
"solds": 13,
"delists": 9,
"vacancy_onsets": 2,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 44,
"lien_releases": 8,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 276,
"structure_changes": 1,
"portfolio_changes": 1162,
"avm_change_median_pct": 0,
"permits_issued": 3
}
},
{
"week": "2026-04-09",
"file_kind": "DELTA",
"parcels_observed": 1947,
"n_events": 55,
"metrics": {
"owner_changes": 0,
"listings": 0,
"relists": 5,
"price_cuts": 12,
"price_rises": 0,
"solds": 0,
"delists": 3,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 24,
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"purchase_measured": true,
"investor_lending_measured": true,
"flips_measured": true,
"borrowers_measured": true,
"takebacks_measured": true,
"counties_measured": false,
"dated": true,
"n_parcels_uncovered": 224192
}
}
],
"dated": [
{
"block": "financing",
"as_of": "2026-06-25",
"reason": "dataset not in current delivery"
},
{
"block": "liens",
"as_of": "2026-06-25",
"reason": "dataset not in current delivery"
},
{
"block": "valuation",
"as_of": "2026-06-25",
"reason": "dataset not in current delivery"
}
],
"terms": "Data: Investorlift Data Services. Public-record and MLS listing data licensed through BatchData; municipal short-term rental registries; Investorlift marketplace records. Attribution and data-use terms: https://developers.investorlift.com/guides/terms"
}
}Properties
Read the weekly change series of a ZIP
The weekly change series of one ZIP, week by week. The metrics: owner changes, new listings, price cuts, sales, delistings, vacancy and delinquency onsets. Also new mortgages and lien releases, the median AVM move and permits issued.
It serves the ZIP codes the history lake covers in the market. Pick the metrics you need and how many recent weeks.
GET
/
v1
/
markets
/
{market}
/
changes
Read the weekly change series of a ZIP
curl --request GET \
--url https://api.investorlift.com/v1/markets/{market}/changes \
--header 'Authorization: Bearer <token>'const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};
fetch('https://api.investorlift.com/v1/markets/{market}/changes', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.investorlift.com/v1/markets/{market}/changes"
headers = {"Authorization": "Bearer <token>"}
response = requests.get(url, headers=headers)
print(response.text){
"data": {
"market": "phx",
"zip": "85251",
"first_week": "2025-10-02",
"last_week": "2026-09-09",
"weeks_applied": 52,
"weeks": [
{
"week": "2025-10-02",
"file_kind": "DELTA",
"parcels_observed": 13920,
"n_events": 3244,
"metrics": {
"owner_changes": 280,
"listings": 0,
"relists": 19,
"price_cuts": 14,
"price_rises": 2,
"solds": 17,
"delists": 10,
"vacancy_onsets": 6,
"vacancy_cleared": 6,
"delinquency_onsets": 4,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 678,
"structure_changes": 38,
"portfolio_changes": 1088,
"avm_change_median_pct": -1.36,
"permits_issued": 6
}
},
{
"week": "2025-10-09",
"file_kind": "DELTA",
"parcels_observed": 7432,
"n_events": 1195,
"metrics": {
"owner_changes": 26,
"listings": 0,
"relists": 14,
"price_cuts": 5,
"price_rises": 1,
"solds": 14,
"delists": 12,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 203,
"structure_changes": 12,
"portfolio_changes": 679,
"avm_change_median_pct": -0.1,
"permits_issued": 6
}
},
{
"week": "2025-10-16",
"file_kind": "DELTA",
"parcels_observed": 8556,
"n_events": 1351,
"metrics": {
"owner_changes": 45,
"listings": 0,
"relists": 8,
"price_cuts": 30,
"price_rises": 5,
"solds": 54,
"delists": 37,
"vacancy_onsets": 0,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 1,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 424,
"structure_changes": 5,
"portfolio_changes": 517,
"avm_change_median_pct": 0.97,
"permits_issued": 8
}
},
{
"week": "2025-10-23",
"file_kind": "DELTA",
"parcels_observed": 7046,
"n_events": 1311,
"metrics": {
"owner_changes": 25,
"listings": 0,
"relists": 14,
"price_cuts": 12,
"price_rises": 1,
"solds": 18,
"delists": 16,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 68,
"structure_changes": 3,
"portfolio_changes": 1048,
"avm_change_median_pct": -0.14,
"permits_issued": 5
}
},
{
"week": "2025-10-30",
"file_kind": "DELTA",
"parcels_observed": 6899,
"n_events": 728,
"metrics": {
"owner_changes": 24,
"listings": 0,
"relists": 9,
"price_cuts": 15,
"price_rises": 1,
"solds": 10,
"delists": 5,
"vacancy_onsets": 1,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 75,
"structure_changes": 1,
"portfolio_changes": 504,
"avm_change_median_pct": 0,
"permits_issued": 11
}
},
{
"week": "2025-11-06",
"file_kind": "DELTA",
"parcels_observed": 18631,
"n_events": 25617,
"metrics": {
"owner_changes": 455,
"listings": 0,
"relists": 170,
"price_cuts": 9,
"price_rises": 15,
"solds": 21,
"delists": 11,
"vacancy_onsets": 1,
"vacancy_cleared": 5,
"delinquency_onsets": 190,
"delinquency_cured": 1068,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 2757,
"structure_changes": 52,
"portfolio_changes": 2860,
"avm_change_median_pct": -1.44,
"permits_issued": 7
}
},
{
"week": "2025-11-13",
"file_kind": "DELTA",
"parcels_observed": 7251,
"n_events": 1387,
"metrics": {
"owner_changes": 10,
"listings": 0,
"relists": 22,
"price_cuts": 3,
"price_rises": 0,
"solds": 13,
"delists": 8,
"vacancy_onsets": 0,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 247,
"structure_changes": 12,
"portfolio_changes": 1027,
"avm_change_median_pct": -0.15,
"permits_issued": 24
}
},
{
"week": "2025-11-20",
"file_kind": "DELTA",
"parcels_observed": 7665,
"n_events": 1077,
"metrics": {
"owner_changes": 57,
"listings": 0,
"relists": 16,
"price_cuts": 7,
"price_rises": 1,
"solds": 4,
"delists": 6,
"vacancy_onsets": 1,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 257,
"structure_changes": 8,
"portfolio_changes": 601,
"avm_change_median_pct": 0,
"permits_issued": 11
}
},
{
"week": "2025-11-21",
"file_kind": "FULL",
"parcels_observed": 18758,
"n_events": 493,
"metrics": {
"owner_changes": 22,
"listings": 0,
"relists": 5,
"price_cuts": 3,
"price_rises": 0,
"solds": 4,
"delists": 0,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 70,
"structure_changes": 0,
"portfolio_changes": 346,
"avm_change_median_pct": 0,
"permits_issued": 11
}
},
{
"week": "2025-11-27",
"file_kind": "FULL",
"parcels_observed": 18758,
"n_events": 285,
"metrics": {
"owner_changes": 0,
"listings": 0,
"relists": 10,
"price_cuts": 3,
"price_rises": 1,
"solds": 14,
"delists": 4,
"vacancy_onsets": 1,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 79,
"structure_changes": 4,
"portfolio_changes": 157,
"avm_change_median_pct": 0,
"permits_issued": 4
}
},
{
"week": "2025-12-02",
"file_kind": "FULL",
"parcels_observed": 18758,
"n_events": 1332,
"metrics": {
"owner_changes": 28,
"listings": 0,
"relists": 12,
"price_cuts": 46,
"price_rises": 0,
"solds": 38,
"delists": 147,
"vacancy_onsets": 3,
"vacancy_cleared": 2,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 260,
"structure_changes": 4,
"portfolio_changes": 598,
"avm_change_median_pct": -0.66,
"permits_issued": 3
}
},
{
"week": "2025-12-04",
"file_kind": "DELTA",
"parcels_observed": 915,
"n_events": 3,
"metrics": {
"owner_changes": 0,
"listings": 0,
"relists": 0,
"price_cuts": 0,
"price_rises": 0,
"solds": 1,
"delists": 1,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 0,
"lien_releases": 0,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 1,
"structure_changes": 0,
"portfolio_changes": 0,
"avm_change_median_pct": 4.52,
"permits_issued": 5
}
},
{
"week": "2025-12-11",
"file_kind": "DELTA",
"parcels_observed": 18289,
"n_events": 43419,
"metrics": {
"owner_changes": 50,
"listings": 0,
"relists": 61,
"price_cuts": 20,
"price_rises": 2,
"solds": 14,
"delists": 172,
"vacancy_onsets": 122,
"vacancy_cleared": 72,
"delinquency_onsets": 3,
"delinquency_cured": 1,
"new_mortgages": 2269,
"lien_releases": 21,
"involuntary_liens": 89,
"assessment_changes": 16450,
"avm_changes": 16082,
"structure_changes": 2030,
"portfolio_changes": 4673,
"avm_change_median_pct": -0.91,
"permits_issued": 8
}
},
{
"week": "2025-12-18",
"file_kind": "DELTA",
"parcels_observed": 10360,
"n_events": 9244,
"metrics": {
"owner_changes": 69,
"listings": 0,
"relists": 30,
"price_cuts": 6,
"price_rises": 0,
"solds": 13,
"delists": 21,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 68,
"lien_releases": 1829,
"involuntary_liens": 4,
"assessment_changes": 0,
"avm_changes": 2886,
"structure_changes": 5,
"portfolio_changes": 3869,
"avm_change_median_pct": -0.21,
"permits_issued": 10
}
},
{
"week": "2025-12-25",
"file_kind": "DELTA",
"parcels_observed": 18385,
"n_events": 1793,
"metrics": {
"owner_changes": 32,
"listings": 0,
"relists": 38,
"price_cuts": 8,
"price_rises": 0,
"solds": 16,
"delists": 32,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 6,
"lien_releases": 13,
"involuntary_liens": 32,
"assessment_changes": 0,
"avm_changes": 284,
"structure_changes": 5,
"portfolio_changes": 1159,
"avm_change_median_pct": 0,
"permits_issued": 2
}
},
{
"week": "2026-01-01",
"file_kind": "DELTA",
"parcels_observed": 8863,
"n_events": 2573,
"metrics": {
"owner_changes": 41,
"listings": 0,
"relists": 180,
"price_cuts": 6,
"price_rises": 1,
"solds": 14,
"delists": 20,
"vacancy_onsets": 0,
"vacancy_cleared": 4,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 28,
"lien_releases": 14,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 460,
"structure_changes": 0,
"portfolio_changes": 1319,
"avm_change_median_pct": 0,
"permits_issued": 2
}
},
{
"week": "2026-01-08",
"file_kind": "DELTA",
"parcels_observed": 7582,
"n_events": 2064,
"metrics": {
"owner_changes": 32,
"listings": 0,
"relists": 19,
"price_cuts": 12,
"price_rises": 0,
"solds": 21,
"delists": 36,
"vacancy_onsets": 5,
"vacancy_cleared": 4,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 45,
"lien_releases": 45,
"involuntary_liens": 8,
"assessment_changes": 0,
"avm_changes": 360,
"structure_changes": 3,
"portfolio_changes": 1325,
"avm_change_median_pct": -0.05,
"permits_issued": 4
}
},
{
"week": "2026-01-15",
"file_kind": "DELTA",
"parcels_observed": 6857,
"n_events": 1267,
"metrics": {
"owner_changes": 28,
"listings": 0,
"relists": 43,
"price_cuts": 13,
"price_rises": 1,
"solds": 24,
"delists": 41,
"vacancy_onsets": 1,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 6,
"lien_releases": 9,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 179,
"structure_changes": 9,
"portfolio_changes": 785,
"avm_change_median_pct": -0.17,
"permits_issued": 3
}
},
{
"week": "2026-01-21",
"file_kind": "FULL",
"parcels_observed": 18772,
"n_events": 17567,
"metrics": {
"owner_changes": 57,
"listings": 0,
"relists": 35,
"price_cuts": 19,
"price_rises": 0,
"solds": 13,
"delists": 30,
"vacancy_onsets": 45,
"vacancy_cleared": 131,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 34,
"lien_releases": 19,
"involuntary_liens": 22,
"assessment_changes": 0,
"avm_changes": 16038,
"structure_changes": 4,
"portfolio_changes": 801,
"avm_change_median_pct": -0.7,
"permits_issued": 3
}
},
{
"week": "2026-02-05",
"file_kind": "DELTA",
"parcels_observed": 12950,
"n_events": 2629,
"metrics": {
"owner_changes": 84,
"listings": 0,
"relists": 75,
"price_cuts": 51,
"price_rises": 3,
"solds": 23,
"delists": 50,
"vacancy_onsets": 8,
"vacancy_cleared": 6,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 44,
"lien_releases": 20,
"involuntary_liens": 2,
"assessment_changes": 0,
"avm_changes": 455,
"structure_changes": 7,
"portfolio_changes": 1485,
"avm_change_median_pct": -0.22,
"permits_issued": 14
}
},
{
"week": "2026-02-12",
"file_kind": "DELTA",
"parcels_observed": 6228,
"n_events": 510,
"metrics": {
"owner_changes": 0,
"listings": 0,
"relists": 47,
"price_cuts": 32,
"price_rises": 0,
"solds": 15,
"delists": 21,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 19,
"lien_releases": 4,
"involuntary_liens": 2,
"assessment_changes": 0,
"avm_changes": 206,
"structure_changes": 4,
"portfolio_changes": 118,
"avm_change_median_pct": -0.3,
"permits_issued": 7
}
},
{
"week": "2026-02-19",
"file_kind": "DELTA",
"parcels_observed": 7633,
"n_events": 1637,
"metrics": {
"owner_changes": 37,
"listings": 0,
"relists": 26,
"price_cuts": 26,
"price_rises": 0,
"solds": 9,
"delists": 22,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 31,
"lien_releases": 4,
"involuntary_liens": 1,
"assessment_changes": 0,
"avm_changes": 270,
"structure_changes": 2,
"portfolio_changes": 1099,
"avm_change_median_pct": -0.2,
"permits_issued": 2
}
},
{
"week": "2026-02-26",
"file_kind": "DELTA",
"parcels_observed": 9337,
"n_events": 1526,
"metrics": {
"owner_changes": 28,
"listings": 0,
"relists": 46,
"price_cuts": 41,
"price_rises": 2,
"solds": 14,
"delists": 29,
"vacancy_onsets": 0,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 15,
"lien_releases": 3,
"involuntary_liens": 1,
"assessment_changes": 0,
"avm_changes": 198,
"structure_changes": 5,
"portfolio_changes": 348,
"avm_change_median_pct": -0.68,
"permits_issued": 3
}
},
{
"week": "2026-03-05",
"file_kind": "DELTA",
"parcels_observed": 9832,
"n_events": 1023,
"metrics": {
"owner_changes": 36,
"listings": 0,
"relists": 39,
"price_cuts": 33,
"price_rises": 1,
"solds": 13,
"delists": 21,
"vacancy_onsets": 0,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 25,
"lien_releases": 3,
"involuntary_liens": 1,
"assessment_changes": 0,
"avm_changes": 307,
"structure_changes": 5,
"portfolio_changes": 464,
"avm_change_median_pct": 0.01,
"permits_issued": 6
}
},
{
"week": "2026-03-12",
"file_kind": "DELTA",
"parcels_observed": 6936,
"n_events": 1633,
"metrics": {
"owner_changes": 35,
"listings": 0,
"relists": 33,
"price_cuts": 40,
"price_rises": 2,
"solds": 13,
"delists": 26,
"vacancy_onsets": 5,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 20,
"lien_releases": 10,
"involuntary_liens": 2,
"assessment_changes": 0,
"avm_changes": 239,
"structure_changes": 4,
"portfolio_changes": 1114,
"avm_change_median_pct": -0.28,
"permits_issued": 4
}
},
{
"week": "2026-03-19",
"file_kind": "DELTA",
"parcels_observed": 8726,
"n_events": 1526,
"metrics": {
"owner_changes": 36,
"listings": 0,
"relists": 30,
"price_cuts": 41,
"price_rises": 1,
"solds": 12,
"delists": 18,
"vacancy_onsets": 5,
"vacancy_cleared": 1,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 23,
"lien_releases": 8,
"involuntary_liens": 2,
"assessment_changes": 0,
"avm_changes": 748,
"structure_changes": 4,
"portfolio_changes": 491,
"avm_change_median_pct": -2.02,
"permits_issued": 6
}
},
{
"week": "2026-03-26",
"file_kind": "DELTA",
"parcels_observed": 8284,
"n_events": 1418,
"metrics": {
"owner_changes": 30,
"listings": 0,
"relists": 40,
"price_cuts": 41,
"price_rises": 1,
"solds": 17,
"delists": 25,
"vacancy_onsets": 1,
"vacancy_cleared": 0,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 18,
"lien_releases": 42,
"involuntary_liens": 0,
"assessment_changes": 0,
"avm_changes": 468,
"structure_changes": 4,
"portfolio_changes": 631,
"avm_change_median_pct": 0,
"permits_issued": 2
}
},
{
"week": "2026-04-02",
"file_kind": "DELTA",
"parcels_observed": 18647,
"n_events": 19230,
"metrics": {
"owner_changes": 58,
"listings": 0,
"relists": 24,
"price_cuts": 53,
"price_rises": 1,
"solds": 17,
"delists": 14,
"vacancy_onsets": 185,
"vacancy_cleared": 111,
"delinquency_onsets": 0,
"delinquency_cured": 0,
"new_mortgages": 46,
"lien_releases": 48,
"involuntary_liens": 94,
"assessment_changes": 0,
"avm_changes": 17357,
"structure_changes": 108,
"portfolio_changes": 743,
"avm_change_median_pct": 0.29,
"permits_issued": 1
}
},
{
"week": "2026-04-07",
"file_kind": "FULL",
"parcels_observed": 18775,
"n_events": 1734,
"metrics": {
"owner_changes": 44,
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"n_events": 1297
},
"ownership": {
"first_week": "2025-07-24",
"last_week": "2026-09-09",
"n_events": 3238
},
"structure": {
"first_week": "2025-07-24",
"last_week": "2026-09-09",
"n_events": 2548
},
"valuation": {
"first_week": "2025-07-24",
"last_week": "2026-06-25",
"n_events": 83657
},
"assessment": {
"first_week": "2025-07-24",
"last_week": "2026-09-09",
"n_events": 16450
},
"owner_profile": {
"first_week": "2025-07-24",
"last_week": "2026-09-09",
"n_events": 58404
},
"classification": {
"first_week": "2025-07-24",
"last_week": "2026-09-09",
"n_events": 263
}
}
}
},
"lenders": {
"as_of": "2026-06-25",
"recordings_through": "2026-06-11",
"counties": [
"04013"
],
"history_capture_share": 0.183706,
"n_lender_ids": 32046,
"purchase_measured": true,
"investor_lending_measured": true,
"flips_measured": true,
"borrowers_measured": true,
"takebacks_measured": true,
"counties_measured": false,
"dated": true,
"n_parcels_uncovered": 224192
}
}
],
"dated": [
{
"block": "financing",
"as_of": "2026-06-25",
"reason": "dataset not in current delivery"
},
{
"block": "liens",
"as_of": "2026-06-25",
"reason": "dataset not in current delivery"
},
{
"block": "valuation",
"as_of": "2026-06-25",
"reason": "dataset not in current delivery"
}
],
"terms": "Data: Investorlift Data Services. Public-record and MLS listing data licensed through BatchData; municipal short-term rental registries; Investorlift marketplace records. Attribution and data-use terms: https://developers.investorlift.com/guides/terms"
}
}Authorizations
API key from the developer console (starts with zpka_). Create one at https://developers.investorlift.com/get-a-key.
Path Parameters
Market code, for example phx.
Required string length:
1 - 16Query Parameters
The ZIP code. It must be one of meta.coverage[].parcel.history.zips.
Pattern:
^\d{5}$How many of the newest weeks to return (default 52, at most 160). Over 52 on Free and Starter, the API clamps the series to 52 over REST and data.weeks_applied says so. Over /mcp the API refuses that request by name (403 plan_limit).
Required range:
1 <= x <= 160Which series to return (comma list or repeated key). Default: every metric.
Minimum array length:
1A weekly series: event counts per kind, the median AVM move in percent among parcels whose AVM moved, or permits issued.
Available options:
owner_changes, listings, relists, price_cuts, price_rises, solds, delists, vacancy_onsets, vacancy_cleared, delinquency_onsets, delinquency_cured, new_mortgages, lien_releases, involuntary_liens, assessment_changes, avm_changes, structure_changes, portfolio_changes, avm_change_median_pct, permits_issued Response
The weekly change series.
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