One integration, many upstreams — services that unify or resell access to other providers' APIs and data.
Every entry is live-probed like the rest of the directory: a maintainer confirmed the endpoint answered an x402 request correctly at review.
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Orders of Magnitude — Unified pay-per-call access to 1,100+ public and utility API endpoints through one wallet. $0.003–$0.10 per call, machine-readable manifest at
/x402.json(mirrored at/.well-known/x402). x402 v2, USDC on Base. -
Cleared Gateway — POST router that returns the best Cleared-verified x402 endpoint for a task (category + strategy). Free to call; pairs with Cleared Check / Witness. Settle-tape aware. Paid probe: https://clearedindex.com/api/x402/ping · Manifest: https://clearedindex.com/.well-known/x402
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402Signal — Fail-closed live-endpoint x402 router. POST /route returns a currently-alive x402 URL or an honest miss. $0.01 USDC on Base, Solana, and Algorand. Example: POST {"need":"weather"}. (OpenAPI) (MCP) (Manifest)
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x402-list — Agent-first directory of x402-payable APIs with a no-auth machine-readable REST feed and a hosted MCP server for finding and verifying endpoints before an agent pays.