{"service":"MatrixFold","version":"0.4.0","endpoint":{"method":"POST","path":"/v1/preflight","endpoint":"POST /v1/preflight","priceUsd":"$0.004","purpose":"Preflight X/Twitter text posts and return ready, blockingReasons, retryableRequest, retryPolicy, and caveats."},"url":"https://api-production-853c.up.railway.app/v1/preflight","payment":{"required":true,"protocol":"x402","network":"eip155:8453","asset":"USDC","priceUsd":"$0.004","unpaidBehavior":"POST returns HTTP 402 with a payment-required challenge."},"useWhen":"Your agent is about to call X POST /2/tweets and needs a retryable request body.","docs":{"capabilities":"https://api-production-853c.up.railway.app/v1/capabilities","openapi":"https://api-production-853c.up.railway.app/openapi.json","examples":"https://api-production-853c.up.railway.app/v1/examples","demo":"https://api-production-853c.up.railway.app/v1/demo/preflight","buyerQuickstart":"https://github.com/jackinehu/MatrixFold/blob/main/docs/BUYER_QUICKSTART.md"}}