Developers
Use one API key and one prepaid balance for every endpoint. 25 data calls in six groups cover property records, listings, sales, investors, lenders and market snapshots. Four more handle underwriting. In Claude and other assistants, four tools are available: underwrite a property, underwrite a list, property history and request validation, which is free.
Make your first call
Send an address with your key and the underwriting sheet comes back as JSON. This is the call from the quickstart, with a sample address.
Quickstartcurl https://api.investorliftdata.com/v1/predict \
-X POST \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: 8b2f6c1a-4d0e-4f7a-9c3b-2e5d8a1f0b64" \
-d '{"address": "2140 E Juniper Ave, Mesa, AZ 85213"}'YOUR_API_KEYA key you create and name in the app.Idempotency-KeyAny value unique to the call. Send it again with the same value and a retry never charges twice.addressOne street address with city, state and ZIP. Sample, fictional.
trace-id: t1a4c9e2f0b3
{
"max_allowable_offer": { … },
"cost_stack": { … },
"comps": [ … ]
}max_allowable_offerThe headline: $187,000 for this sample address.cost_stackEvery line of the offer, from the repaired value of $305,000 down to the offer.compsThe comparable sales it was built from, with their sale dates.trace-idThe Trace ID, sent as a header on every answer.
From the docs
Endpoint
POST https://api.investorliftdata.com/v1/predict, with your key as a bearer token.
AuthenticationSpeed
An underwrite usually returns in 5 to 10 seconds. Most of that time is spent fetching the property records.
QuickstartValidate a request, free
POST /v1/validate checks a key and an address shape for free, even at a zero balance.
QuickstartRetries
Send an Idempotency-Key header and a retry never charges twice.
IdempotencyErrors
Every error is an RFC 9457 problem detail with a stable type that links to its own page.
ErrorsVersions
One path for an underwrite, /v1/predict, with no sunset date on it.
VersioningRate limits
60 calls a minute on packs, 300 on a Desk.
Rate limitsSpending
A daily spending cap, $250 by default. The balance stops at zero.
Spending capAssistants
Each assistant connection spends up to $25 a day by default, and any single question over $5 asks first.
Connect an assistant
Included with every account
- Every account with a saved card can create API keys. Paid calls need a balance.
- Several keys, each with its own name.
- A Request log: every call and its response for 90 days, with errors explained in plain words.
- A playground that writes the call in curl, Node and Python.
- One-click connect for Claude, and an MCP config for other assistants.
- Service health, in the app.
- A Trace ID on every answer.
All endpoints
25 data calls cover what is on record for a property, what is listed or sold near a place, and which investors and lenders are active there. Four more handle underwriting. Every endpoint uses the same key and the same balance.
Free: request validation, coverage, the two ZIP snapshots, the investor activity summary and, with a Desk, company name search. Endpoints marked Desk only return buyer, investor and lender data, which comes with a Desk. If a place is outside coverage, we decline the call and you are not charged. A call that fails, times out or finds no property is not charged. Price per call.
Underwriting
The maximum allowable offer, every number behind it and the comparable sales, for one address or a list.
4 calls- U1
Underwrite one address
Returns the underwriting sheet for one address.
Docs - U2
Underwrite a list
Up to 10 addresses in one call.
Docs - U3
Property history
The deal history of one property: its sales, any flip, permits and its listing.
Docs - U4
Validate a request, Free
Checks your key and the shape of what you send, free.
Docs
Property record and ownership
What is on record for one property, from an address or a property ID.
5 calls- 01
Find a property by address
Send a street line and ZIP and get the full property record. $0.10 for each address found.
Docs - 02
Property record
Address, owner on the county roll, building and tax facts, and financing for one property.
Docs - 03
Ownership history
Every recorded deed of the property, oldest first, with both sides of each transfer.
Docs - 04
Listing history
Every version of every listing of the property in the listing records.
Docs - 05
Investors who buy homes like this one, Desk only
Investor companies whose recent purchases resemble this property, ranked.
Docs
Listings and rentals near a place
What is listed for sale or rent around a point, a street, a set of ZIPs or a map area.
3 callsSales and investor activity
What has sold near a place, and what investors are buying there.
5 calls- 09
Recent sales near a place
A page of sold listings near the place, each matched to its recorded deed.
Docs - 10
Investor purchases near a property, Desk only
A page of investor purchases in the place, filtered by date, price and type of purchase.
Docs - 11
Active investors in a ZIP, Desk only
The investor companies buying in one or more ZIPs, ranked.
Docs - 12
Investor activity summary, Free
The headline numbers for investor purchases in one place.
Docs - 13
One investor purchase, Desk only
Both sides of the deed, the price, any resale, the transfers around it and the loan that financed it.
Docs
ZIP and market snapshots
Headline numbers for one ZIP or a list of them.
3 calls- 14
ZIP snapshot, Free
Purchases, prices, buyers, listings and agents for one ZIP.
Docs - 15
Snapshot of several ZIPs, Free
The same numbers for a list of ZIPs, and which of them the data covers.
Docs - 16
Sellers in a ZIP, Desk only
The companies that sold homes in a ZIP, most sales first, with how quickly they resold.
Docs
Investor companies and lenders
Who an investor company is and what it buys and sells, and who lends where.
8 calls- 17
Find an investor company by name, Free, Desk only
Investor companies whose names match the name you send, best match first.
Docs - 18
Investor company profile, Desk only
One company's registered entities, profile, holdings, and lending and borrowing.
Docs - 19
Investor company purchases, Desk only
The company's purchases, newest first.
Docs - 20
Investor company sales, Desk only
What the company sold, and to whom.
Docs - 21
Lenders active in a place, Desk only
The lenders in a state, county or list of ZIPs, ranked.
Docs - 22
Lender profile, Desk only
One lender's loan counts, open loans, the range of its loan amounts, rates and terms, and where it lends.
Docs - 23
Lender loans, Desk only
The lender's loans, newest first.
Docs - 24
Who a lender lends to, Desk only
The lender's borrowers, as companies.
Docs
Coverage
Where the data reaches, and how current it is.
1 call- 25
Coverage, Free
The states the data covers, with the date of the data behind each. Free.
Docs
Join the closed beta
Packs start at $50. A Desk adds buyer and lender data.