Pay-per-call public-data APIs for AI agents

Instant x402 v2 payment in native USDC on Base mainnet. No login, no subscriptions, no agent API key. Each paid request returns a structured JSON result. Failures are automatically refunded.

Machine-readable: OpenAPI · x402 discovery · llms.txt · terms

Base transaction receipt

Check confirmed status, block, gas and log count for a Base transaction. Verified RPC facts, not investment advice.

0.002900 USDC per completed request (Base).

POST /v1/data/base-receipt

{"tx":"0x0000000000000000000000000000000000000000000000000000000000000000"}

Base wallet USDC balance

Look up the native USDC balance of a Base wallet. No account, no API key, pay per request with x402.

0.002900 USDC per completed request (Base).

POST /v1/data/base-usdc

{"address":"0x0000000000000000000000000000000000000000"}

Legal entity LEI verification

Look up an official LEI legal-entity record and entity status from GLEIF. Public company reference data.

0.006900 USDC per completed request (Base).

POST /v1/data/lei

{"lei":"5493001KJTIIGC8Y1R12"}

Research DOI metadata verification

Get bibliographic title, publisher, date and citations by DOI from Crossref. Does not redistribute copyrighted abstracts.

0.004900 USDC per completed request (Base).

POST /v1/data/doi

{"doi":"10.1038/nphys1170"}

Domain DNS verification

Check public A, AAAA, MX, NS or TXT DNS records and answer status using DNS-over-HTTPS. No security guarantee.

0.003900 USDC per completed request (Base).

POST /v1/data/dns

{"domain":"example.com","type":"MX"}

Wikidata entity facts

Resolve a Wikidata Q identifier to structured CC0 labels, descriptions and Wikipedia reference links.

0.003900 USDC per completed request (Base).

POST /v1/data/wikidata

{"qid":"Q42"}

Company identity and domain evidence

Combine official GLEIF LEI entity status and public domain DNS evidence in one structured response, for procurement agents. Not a legal guarantee.

0.014900 USDC per completed request (Base).

POST /v1/data/company-check

{"lei":"5493001KJTIIGC8Y1R12","domain":"example.com"}

Research papers search

Find scholarly works by keyword with OpenAlex CC0 bibliographic metadata; source data may have limitations.

0.006900 USDC per completed request (Base).

POST /v1/data/academic-search

{"q":"climate change"}

SEC US company filing summary

Look up an SEC company by numeric CIK and summarize published filings. Requires SEC_CONTACT_EMAIL for upstream identification.

0.006900 USDC per completed request (Base).

POST /v1/data/sec-company

{"cik":"320193"}

These are third-party public data; no assurance of accuracy or legal identity, token safety, or investment suitability. Fees, API availability and price are shown in each HTTP 402 quote.