{"service":"MatrixFold","version":"0.3.1","category":"agentic publishing guardrail","summary":"Paid x402 API for AI agents that need to validate, repair, preflight, or explain social publishing payloads before calling downstream platform APIs.","bestFor":["Preflight an X/Twitter POST /2/tweets request before publishing.","Convert a validated X payload into a retryable request body.","Classify X API create-post failures into retryable and non-retryable actions.","Repair invalid social post payloads with machine-readable rule codes and diffs."],"notFor":["Managing user social accounts.","Posting directly to X, LinkedIn, Xiaohongshu, or any other platform.","Guaranteeing platform acceptance, account permissions, API plan access, rate limits, or moderation outcomes."],"recommendedFirstCall":{"endpoint":"POST /v1/preflight","priceUsd":"$0.004","useWhen":"Your agent has an X post and wants a retryable POST /2/tweets payload before calling X."},"paidEndpoints":[{"endpoint":"POST /v1/preflight","priceUsd":"$0.004","purpose":"Preflight X/Twitter text posts and return ready, blockingReasons, retryableRequest, retryPolicy, and caveats."},{"endpoint":"POST /v1/explain-failure","priceUsd":"$0.004","purpose":"Explain failed X create-post responses and return reasonCode, retryability, retryPolicy, and repair hints."},{"endpoint":"POST /v1/repair","priceUsd":"$0.006","purpose":"Repair invalid social publishing payloads and return corrected JSON plus a machine-readable diff."},{"endpoint":"POST /v1/validate","priceUsd":"$0.003","purpose":"Validate X, LinkedIn, or Xiaohongshu payloads against deterministic publishing guardrails."},{"endpoint":"POST /v1/compile","priceUsd":"$0.01","purpose":"Compile source content into social publishing payloads with validation reports."}],"freeEndpoints":["GET /health","GET /v1/capabilities","GET /v1/rules","GET /v1/examples","GET /openapi.json"],"buyerSearchIntents":["X POST /2/tweets preflight","Twitter API payload validator","social publishing guardrail","agent publishing retryable request","social post repair API","X API failure explainer"],"docs":{"openapi":"/openapi.json","examples":"/v1/examples","rules":"/v1/rules","buyerQuickstart":"https://github.com/jackinehu/MatrixFold/blob/main/docs/BUYER_QUICKSTART.md"}}