x402 Crypto Data API Source Fit

Track x402 and machine-payment readiness for crypto data source discovery without claiming PubFi executes live supplier payments

Request integration4 source signals2 categories

Claim-safe statuses distinguish source profiles, evaluation-only pages, requested integrations, and available gateway/tooling surfaces without exposing paid procurement, approval, or provider-fetching flows

Source Fit Summary

Track x402 and machine-payment readiness for crypto data source discovery without claiming PubFi executes live supplier payments.

Primary query: x402 crypto data API
Supporting queries: x402 API marketplace
Query group: x402 crypto data APIs
Best starting page: This page
Availability status: Request integration
Demand signal: x402 payment
Markdown mirror: /discovery/topic/x402-crypto-data-api.md

Source Evidence

Discovery can compare x402 readiness and collect integration demand, but PubFi does not publish a payment endpoint, payment requirement, facilitator URL, asset/network allowlist, or supplier payment execution flow today.

Comparison Criteria

Pricing and payment terms: Compare whether price, amount, and refund or rate-limit caveats are public, returned by the 402 challenge, or still endpoint-specific.
Chain, currency, and asset support: Check public support for networks and payment assets such as Base or USDC instead of assuming all wallets, chains, or currencies are accepted.
Request signing and 402 flow: Look for the first 402 challenge, payment-required header or body, payment signature step, and final 200 data response before calling a source machine-payable.
Endpoint coverage: Distinguish x402-enabled quote, listing, DEX, or marketplace endpoints from the broader provider catalog and from non-x402 market-data or on-chain-state sources.
Human and agent callability: Prefer evidence that says whether developers, backend systems, wallets, or AI agents can call the endpoint and what spending controls are expected.
PubFi payment boundary: Use this page for source discovery and integration interest; it does not claim PubFi executes x402 supplier payments or exposes a payment route today.

Related Discovery Records

Sources

CoinGecko API: /discovery/api/coingecko-api
CoinMarketCap API: /discovery/api/coinmarketcap-api
Kaiko: /discovery/api/kaiko
Dune API: /discovery/api/dune-api

Demand Signal

PubFi can record interest in this source-selection workflow without storing payment proofs, wallet data, raw search queries, or procurement notes.

Signal x402 data demand