# The API Universe for Agent Builders
### A verified catalog of verification, provenance, tracking, and pricing services — synmerco.com

If a fact can be verified by software, an agent can trade on it. This catalog verifies 180+ real services, each tagged with its access model. Compiled and verified August 2026. Access models change — check current terms before building.

## Authentication & Grading
At your approve() gate: take the claimed cert number from the proof, call the grader's lookup, require an exact match on grade + description before releasing funds.
- GIA Report Results API (diamonds) — paid/partner GraphQL; free web Report Check fallback
- IGI Report Check — web lookup
- PSA Public API (cards, autographs, tickets) — FREE token, OAuth2; cert -> description + grade
- BGS/Beckett, SGC, CGC, CBCS — web lookups
- PCGS & NGC (coins) — authoritative cert lookups, web/app only (no public REST API)
- PMG (paper money), CACG (coins), WATA (video games) — web lookups
- Entrupy (handbags/sneakers) — paid device + platform
- JSA (autographs) — web lookup
- WatchRegister (stolen watches) — paid check; Chrono24/WatchCharts — NO official API (scrapers only)

## Identity of Things
Decode the physical identifier (VIN, GTIN, serial, HIN, tail number) against the authoritative registry.
- NHTSA vPIC — FREE, no key; VIN -> ~140 attributes, batch 50
- NMVTIS (title/salvage/odometer) — via approved resellers only (VinAudit, ClearVin...)
- Carfax / AutoCheck — partner/enterprise only
- FAA Aircraft Registry — free daily bulk CSV + web N-number inquiry (no REST)
- USCG PSIX vessel documentation — free web lookup only
- Verified by GS1 / GTIN Check — freemium (GS1 US Data Hub from $500/yr)
- UPCitemdb (free 100/day), Open Food Facts (free), Barcode Lookup
- ISBNdb (paid), Google Books (free key), Open Library (free)
- FCC ULS License View — free JSON + bulk
- OEM serials (Caterpillar, John Deere) — dealer portals, no public API

## Property, Title & Records
Resolve address/APN to ownership + liens; confirm the counterparty is the record owner.
- ATTOM — paid; 160M+ US properties; deeds, tax, mortgage, AVM; has an MCP server
- Rentcast — freemium; CoreLogic / First American — enterprise; HouseCanary — paid AVM
- Zillow / Bridge Interactive — partner-gated
- HM Land Registry (UK) — free + paid APIs
- USPTO (patents/trademarks) — free; SEC EDGAR — free, no key; OpenCorporates — freemium; Companies House UK — free
- PACER (paid) / CourtListener RECAP (free) — court records
- UCC/lien searches — state SOS or paid aggregators

## Movement, Delivery & Condition
Release on a verified "delivered" scan or geofence arrival; for sensitive goods, require the sensor log in-threshold.
- EasyPost — freemium; trackers $0.02 standalone
- Shippo — freemium; AfterShip — freemium, 1,400+ carriers normalized
- UPS / FedEx / USPS — free registered developer APIs
- project44, FourKites — enterprise freight visibility
- MarineTraffic (Kpler) — enterprise AIS; Spire — enterprise; AISStream.io — FREE WebSocket; Datalastic/VesselFinder — paid self-serve
- FlightAware AeroAPI — paid; OpenSky — free non-commercial
- Tive, Sensitech — paid IoT condition (temp/shock) logging
- Samsara / Motive / Geotab — fleet ELD/GPS APIs
- Planet (paid) / Sentinel Hub (freemium) — satellite imagery
- NOAA/NWS + Open-Meteo — FREE weather verification

## Market Pricing & Comps
Sanity-check the escrow amount against fair market value before release.
- eBay Marketplace Insights (sold data) — partner-only, individuals routinely denied; Browse API (active listings) — free
- StockX / GOAT — no official API (resellers/scrapers)
- Discogs — FREE API (vinyl); PriceCharting — paid (cards/games)
- LBMA metals — licensed benchmark; Metals-API / GoldAPI — freemium
- KBB / Black Book / J.D. Power — partner; EquipmentWatch — paid; Ritchie Bros — auction results
- LiveAuctioneers / Invaluable — partner/web; Artnet / Artprice — paid
- Liv-ex (wine) — paid API; Rare Whisky 101 — subscription
- CardLadder / Market Movers — subscription

## Documents, Signatures & Notarization
Require a signed/notarized "completed" webhook, or parse the uploaded document and validate fields.
- DocuSign eSignature + Notary (RON) — paid APIs
- Dropbox Sign, Adobe Acrobat Sign — paid
- Proof (Notarize) — paid remote online notarization
- AWS Textract / Google Document AI / Azure Document Intelligence — paid OCR/parsing

## People, Identity & Compliance
KYC the counterparty and screen sanctions before funding/withdrawal on high-value deals.
- Stripe Identity — $1.50/verification (first 50 free)
- Persona, Onfido (Entrust), Jumio, Veriff, Sumsub — paid/enterprise
- Plaid — bank/income/identity
- ComplyAdvantage — sanctions/PEP screening; OpenSanctions — paid API + open data; OFAC SDN — free source lists
- NPI Registry (US medical) — FREE; Checkr — background checks; Middesk — business verification

## The Weird Long Tail
For niche assets, verify the registry that governs that market — and where no API exists, document the manual check.
- openFDA — FREE CC0 (drug NDC, device UDI, recalls); AccessGUDID — free REST
- CPSC recalls — free, no key; NHTSA recalls/complaints — free
- USDA Organic INTEGRITY — public search + developer API
- FSC certificate search — public dashboard + official API by request
- Energy Star certified products — free Socrata API
- UL Product iQ — web lookup only (no API)
- Verra & Gold Standard (carbon credits) — public lookups; transaction APIs phased/forthcoming 2026
- BrickLink + Brickset (LEGO) — free APIs
- Estibot (domain appraisal) — paid; GoDaddy appraisal — web tool
- Jockey Club / Equibase (horses) — licensed data, no open API; AKC — no public API
- Art Loss Register (700,000+ items) — paid human-mediated search; Interpol Stolen Works of Art — app + gated DB; FBI National Stolen Art File — web only
- NICB VINCheck (stolen vehicles) — free web lookup, no API

## Honest caveats
- A cert lookup proves the RECORD exists, not that the item in hand matches it — counterfeiters reuse real cert numbers. Cross-check images/measurements where returned.
- Many third-party "APIs" for StockX, Chrono24, PSA, Equibase are unofficial scrapers that may violate terms of use.
- FAA and USCG data are bulk/web, not real-time REST — ingest and refresh.
- Firearm serials and some records are legally restricted; respect access law.

Build your agent: https://synmerco.com/agent-specs · Tools: npx @synmerco/mcp-server · pip install synmerco