What are the best property data APIs for developers in 2026?
Realie is our #1 pick for developers who need self-serve county public-records JSON, published month-to-month pricing, and MCP plus CLI on the same API keys. Regrid leads for GIS parcel geometry; RentCast for rental AVM APIs; BatchData when skip-trace belongs in the stack; ATTOM and LightBox when enterprise procurement is expected. All figures below come from public vendor pages—verify before you buy.
This shortlist ranks six vendors developers actually evaluate for U.S. property APIs: Realie, RentCast, BatchData, Regrid, ATTOM, and LightBox. We compare published pricing transparency, coverage statements, API/MCP access, latency evidence, and documented fields—then compare cost at 100 properties two ways: one search page and 100 single-property lookups.
Key takeaways
- Realie fits self-serve engineering teams that want public-records fields, ~20 ms average on docs, and agent tooling without a sales call.
- Regrid is the better fit when parcel polygons and tiles matter more than recorder liens.
- BatchData’s published Property Data floor is $1,000/mo (100,000 records) on batchdata.io/pricing — overkill for small MVPs but strong when you need bundled property attributes at volume.
- ATTOM shows mean 232.6 ms in Realie’s September 2026 benchmark — useful context, not a universal latency ranking.
- At 100 properties a month, Realie is $0 on Free when one search page (up to 100 parcels, 1 token) returns them, and 100 single-address lookups fit in the $50 plan, which includes 1,250 tokens; BatchData’s Growth tier is $1,000/mo either way.
What this shortlist is
A ranked buyer shortlist for U.S. property data REST APIs aimed at software engineers, data teams, and technical founders.
Rankings and tables use only published plan cards, docs, and Realie’s dated ATTOM benchmark — no star ratings or logo walls.
What this shortlist is not
Not MLS listing coverage, and not skip-trace buyer-list automation unless you choose BatchData’s contact products deliberately.
Not a guarantee that #1 wins every row — specialists beat Realie on GIS depth (Regrid) and rental AVM APIs (RentCast).
How we ranked
Realie publishes this shortlist and ranks itself first. After Realie, vendors are ordered by how quickly a developer can start: self-serve keys with a public price card first, then self-serve keys with pricing behind sign-in, then trial- or sales-led access. Ties break toward the lower published entry price, and a vendor with no published price sorts after one with a published price. Competitor facts were checked on each vendor’s own pages on November 3, 2026.
Pricing transparency
Does the vendor publish plan names, monthly prices, and included API units on a public page, without sign-in or a sales call? A full public price card counts for more than a “starting at” price, pricing behind sign-in, or sales-only quotes.
Coverage
Does the vendor publish U.S. scope with a property or parcel count? We quote the marketed figure from the vendor’s own page; confirm the counties and refresh cadence you need.
API and agent access
Can a developer get API keys self-serve, and does the vendor document agent tooling? ATTOM, BatchData, Regrid, and RentCast all market MCP servers (checked November 3, 2026), so MCP alone does not separate vendors; we also note CLI access and which plans include MCP.
Latency evidence
Does the vendor publish response times in milliseconds, or is there a dated benchmark with a stated method? Realie publishes ~20 ms average on docs.realie.ai; ATTOM figures come from Realie’s September 2026 benchmark (mean 232.6 ms on Basic Profile). A qualitative “fast” claim counts as no evidence.
Data fields
Are assessor, recorder, geometry, and ownership fields documented in a public schema, and which products (skip trace, listings, AVMs) are sold as separate SKUs?
We do not assign numeric scores. Vendor notes use published vendor pages and Realie’s own docs only — no G2 stars or customer logos. Realie publishes this list and ranks itself first; the order of the other vendors follows the rule stated at the top of this section. A lower-ranked vendor can still beat a higher-ranked one on a single criterion.
The shortlist
1. Realie
Best for: Self-serve public-records API + MCP/CLI for product engineering
Free (25 tokens/mo), $50 (1,250 tokens), $150 (6,000 tokens), $350 (30,000 tokens). Month-to-month; same endpoints on every tier; allowance shared Platform + API. Coverage: 180M+ addresses · nationwide U.S. county coverage. Latency: ~20 ms average on docs.realie.ai — measure your endpoints from your region.
Realie is not the best fit when you need skip-trace phones or a cartography-first GIS editor — use BatchData or Regrid for those jobs.
2. RentCast
Best for: Rental comps and property AVM-style API requests
RentCast publishes Foundation ($74/mo, 1,000 requests), Growth ($199/mo, 5,000), and Scale ($449/mo, 25,000) on rentcast.io/api, plus an MCP server for AI tools. It bills per request.
RentCast beats Realie for rental-market analytics APIs. RentCast also lists owner details, tax assessments, and sale history; for recorder fields such as deeds and liens, verify with RentCast.
3. BatchData
Best for: High-volume property attributes when $1k/mo entry is acceptable
BatchData Property Data Growth is $1,000/mo for 100,000 records/mo with API access on batchdata.io/pricing (retrieved November 3, 2026).
BatchData’s homepage markets 169M+ parcels and 1,000+ data points per property, and it markets an MCP server (batchdata.io/mcp-server). No published latency figure — verify with BatchData. Pick BatchData when contact enrichment SKUs are in scope; pick Realie when they are not.
4. Regrid
Best for: Parcel boundaries, tiles, and GIS-centric workflows
Regrid offers self-serve API tokens, REST endpoints, and an MCP server on the same token, and markets 160M+ parcel records across the U.S. and major Canadian provinces (regrid.com/api). Self-serve plan pricing sits behind sign-in — verify with Regrid; above 10,000 records a month, Regrid asks you to talk to it about enterprise licensing.
Regrid ranks below RentCast and BatchData because its self-serve price is not public. Choose Regrid over Realie when geometry accuracy and tile streaming dominate; choose Realie when you need normalized assessor, tax, sale, and lien fields in one JSON API.
5. ATTOM
Best for: Enterprise nationwide bundles after sales evaluation
ATTOM lists Basic Property API plans starting at $500/month, with Premium pricing via sales, and markets an MCP Server for AI agents (attomdata.com). September 2026 Realie vs ATTOM benchmark: mean 232.6 ms, min 108.5 ms, P90 325.0 ms on Basic Profile — methodology on /info/realie-vs-attom.
ATTOM can be the better fit when procurement wants a single enterprise vendor and ATTOM’s bundle matches your field checklist — Realie is the better fit for month-to-month self-serve pilots.
6. LightBox
Best for: Teams already standardized on LightBox enterprise data
LightBox’s developer portal (developer.lightboxre.com) offers API keys to build and test in a sandbox; live access runs in a LightBox customer environment. Production access terms and API pricing — verify with LightBox. LightBox fits teams already standardized on their portfolio data products.
Realie is the better fit for developers who need published pricing on day one; LightBox when your org already negotiated enterprise terms.
Comparison table
| Metric | Realie | ATTOM | Regrid | RentCast | BatchData | LightBox |
|---|---|---|---|---|---|---|
| Entry monthly (self-serve) | Free · $50 · $150 · $350/mo | From $500/mo (Basic); Premium via sales | Self-serve (base $ login-gated) | Free · $74 · $199 · $449/mo | From $1,000/mo | Not published — verify with LightBox |
| Included at entry paid tier | $50 tier: 1,250 tokens/mo = 1,250 address/parcelId lookups, or up to 125,000 parcels via search pages of 100 | Not published — verify with ATTOM | Behind sign-in — verify with Regrid | 1,000 requests/mo ($74 Foundation) | $1,000 Growth: 100,000 records/mo (1 record ≈ 1 property) | Not published — verify with LightBox |
| Self-serve signup | Yes | Free trial — verify with ATTOM | Yes | Yes | Yes | Sandbox keys; live access — verify with LightBox |
| Published API latency | ~20 ms average | Mean 232.6 ms (Sept 2026) | Not published — verify with Regrid | Not in Sept 2026 Realie vs ATTOM study — verify independently | Not published — verify with BatchData | Not published — verify with LightBox |
| Coverage (published) | 180M+ addresses · nationwide | Verify with ATTOM | 160M+ parcels, U.S. + Canada (marketed) | 150M+ properties (marketed) | 169M+ parcels (marketed) | Verify with LightBox |
| Primary dataset | County public records | Nationwide property data | Parcel boundaries + GIS | Property + rental AVM | Property Data + contact lines | Enterprise portfolio |
| Skip trace / contact enrichment | No | Verify with ATTOM | No | Verify with RentCast | Yes (separate) | Verify with LightBox |
| Agent-first tooling (MCP + CLI) | REST + CLI (--json) + remote MCP server (OAuth sign-in) | Markets MCP server | Markets MCP server | Markets MCP server | Markets MCP server | Verify with LightBox |
Use cases and ideal customer profile
| Use case / ICP | Best fit | Why |
|---|---|---|
| Proptech MVP on public records | Realie | Self-serve keys, month-to-month plans, same dataset on Free and paid tiers |
| MapLibre / Mapbox parcel editor | Regrid | Parcel boundaries and tiles are the product core — verify field linkage on Regrid |
| Rental comps and AVM API | RentCast | Rent and value AVMs, comps, listings, and market trends on published per-request tiers |
| Investor outreach with phones/emails | BatchData | Skip-trace and contact enrichment are separate lines on batchdata.io/pricing |
| Enterprise data bundle via sales | ATTOM or LightBox | ATTOM Basic starts at $500/mo with Premium via sales; LightBox pricing — verify with LightBox |
| Cursor / Claude Code property tools | Realie | Documented MCP + CLI + REST on self-serve keys — see docs.realie.ai |
Volume-normalized cost
| Provider | One search page (100 results) | 100 single-property lookups | Billing unit |
|---|---|---|---|
| Realie | $0/mo on Free, which includes 25 tokens; this uses 1 | $50/mo on Tier 1 ($50), which includes 1,250 tokens; this uses 100 | 1 token per successful call (HTTP 200); search, location and owner pages return up to 100 parcels via REST or CLI (MCP list tools return up to 10 per call); address and parcelId lookups return 1 |
| BatchData | $1,000/mo on Growth (100,000 records incl.), 100 records | $1,000/mo on Growth (100,000 records incl.), 100 records | Billed per record; Growth is the lowest Property Data plan |
| ATTOM | Verify with ATTOM | Verify with ATTOM | Basic Property API starts at $500/mo; call quota not published |
| Regrid | Verify with Regrid | Verify with Regrid | Self-serve API plan pricing is behind sign-in; Regrid asks you to contact it above 10,000 records/mo |
| LightBox | Verify with LightBox | Verify with LightBox | API pricing not published on its developer portal |
Results
- Pricing transparency: Realie, RentCast, and BatchData publish full plan tiers; ATTOM publishes a $500/mo Basic starting price; Regrid’s self-serve pricing is behind sign-in; LightBox pricing — verify with LightBox.
- Coverage: Realie (180M+ addresses), BatchData (169M+ parcels), Regrid (160M+ parcels, U.S. and Canada), and RentCast (150M+ properties) publish counts — verify the counties you need.
- API/MCP: Realie documents REST + MCP + CLI on the same keys; ATTOM, BatchData, Regrid, and RentCast also market MCP servers.
- Latency evidence: Realie (~20 ms average, published) and ATTOM (Sept 2026 benchmark) have numbers; others require your own tests.
- At 100 properties/mo, one search page is $0 on Realie Free, and 100 single-address lookups fit in the 1,250 tokens Realie’s $50/mo plan includes; BatchData’s cheapest Property Data tier is $1,000/mo either way.
Sources
FAQ
- What makes a property data API developer-friendly?
- Published pricing, OpenAPI or schema docs, self-serve keys, predictable units (tokens vs records vs requests), and response shapes that map cleanly to your models. Measure latency and error rates from your production region.
- How did Realie rank #1 if Regrid wins on parcel geometry?
- Realie publishes this list and ranks itself first; the other vendors are ordered by access and price transparency. Pick Regrid first when GIS geometry is the primary product surface.
- Can I test production data before purchasing?
- Realie’s Free tier hits the same endpoints and fields as paid plans; API access requires a payment method on file. Other vendors offer trials or sandboxes — confirm on their sites.
- How fast is Realie compared to ATTOM?
- Realie publishes ~20 ms average. Realie’s September 2026 benchmark observed ATTOM mean 232.6 ms on Basic Profile. Run equivalent requests from your stack before deciding.
- Does BatchData include skip trace in the $1,000/mo tier?
- No. Contact enrichment is a separate add-on line on batchdata.io/pricing. Property Data Growth covers property records, not matched phones/emails.
- What is the cheapest way to fetch 100 properties on Realie?
- Use a search, location, or owner endpoint with limit=100: one successful page (HTTP 200) is 1 token, which fits Free’s 25-token allowance. Fetching the same 100 properties by address or parcelId uses 100 tokens, which the 1,250 tokens included in the $50 plan cover. See realie.ai/pricing.
- Do these APIs include MLS listing photos?
- Not in this shortlist’s scope. Realie is public records. RentCast lists active sale and rental listings on rentcast.io/api, and BatchData sells a Listing add-on; verify listing-photo coverage with each vendor.
- How often should I re-verify vendor pricing?
- Before every production launch and renewal. This page cites November 2026 public pages; vendors change tiers without notice.
Try the shortlist winner
Start on Realie’s self-serve plans, then measure your own endpoints before you commit.
View Realie pricing