Rent intelligence API · by Wellness Labs LLC
Most rent APIs give you a bare number. Fía blends real comparables with a government baseline, then an AI layer explains the estimate in plain language. A second endpoint returns the public record behind the address: a HUD rent benchmark anywhere in the US, plus assessed value and property tax where we hold parcels. One key, one quota, two endpoints.
GET https://fia.rent/api/v1/rent-estimate ?address=1524+S+6th+St+Milwaukee+WI &bedrooms=2 → 200 OK { "estimate": 985, "currency": "USD", "low": 887, "high": 1084, "method": "blended", "sources": { "census_baseline": 950, "comparables": 4 }, "insight": "Con base en la mediana del Censo ($950) y 4 unidades comparables en Fía, ~$985/mes es razonable para 2 recámaras en el sur de Milwaukee. Es una estimación, no un avalúo.", "provider": "Fía · Wellness Labs LLC" }
Every estimate comes with a plain-language market read — not just a number. That's the difference vs. a lookup table.
Blends live rental comparables with a Census baseline. Accuracy compounds as the network grows.
HUD Small Area FMR by bedroom for any US ZIP, plus assessed value, unit count, year built and an estimated annual tax where we hold parcels.
Responses carry explicit coverage flags, so "we don't cover this area" is distinguishable from "we do, but no parcel matched" — no guessing at nulls.
JSON in, JSON out. Address or lat/lng + bedrooms. Sub-second. No SDK required.
Insights in Spanish and English — tuned for underserved US Latino rental markets first.
We don't resell your query data. Clear terms, predictable pricing.
Every figure says how it was derived — comps, baseline, blended, or the named public file it came from — with a confidence range on estimates.
Both authenticate with the same x-api-key header and draw on the same monthly quota. Full parameters and fields in the reference.
GET /api/v1/rent-estimateAn estimated fair monthly rent for any US address, with a low/high range, the method that produced it, and — on paid plans — an AI market read explaining the number.
Takes address, or zip, or lat+lon, plus bedrooms.
GET /api/v1/propertyWhat public records say about one address. Nationwide: HUD's Small Area Fair Market Rent for the ZIP, by bedroom count. In markets where we hold parcel data (Milwaukee, WI): assessed value, unit count, year built, and an estimated annual property tax derived from the local rate.
{
"coverage": { "rent": true, "assessment": true,
"assessmentAvailableHere": true },
"rent": { "monthly": 1140, "source": "hud_safmr",
"fiscalYear": 2026 },
"assessment": { "assessedTotal": 198000, "units": 2,
"yearBuilt": 1912 },
"propertyTax": { "annualEstimate": 4118,
"ratePer1000": 20.8 },
"provider": "Fía · Wellness Labs LLC"
}Every figure carries its source. HUD's SAFMR is a voucher payment standard, not observed asking rent; an assessed value is not an appraisal and an estimated tax is not a tax bill. Outside a market with parcels, the assessment fields are null and the response says so — rather than substituting a weaker number that would read as the same thing.
Pick a plan and start building.
$49/mo
Estimates are informational, not appraisals. Billing by Wellness Labs LLC.