x402

Pay-per-request marketplace access

Surplus Intelligence exposes its OpenAI-compatible inference, X/Twitter API, and crypto RPC resources over x402, the HTTP-native payment protocol. There's no API key and no account: an agent calls a resource, receives an HTTP 402 challenge with the price, pays in USDC on Base, and retries. Pricing is market-based — the final amount is returned in each 402 challenge.

Discovery

The marketplace publishes machine-readable discovery documents listing every payable resource, its method, and its pricing scheme.

GET /x402/info— service + resource summary
/.well-known/x402— the standard x402 resource manifest

Resources are reachable under /x402/*. Each returns an HTTP 402 with payment requirements until a valid payment is attached.