# MatrixFold

MatrixFold is an x402-paid API for AI agents that need deterministic guardrails before calling downstream APIs.

Best social publishing call: POST /v1/preflight before calling X/Twitter POST /2/tweets.
Best crypto risk call: POST /v1/crypto/risk-brief before wallet approval, token listing, or trading workflows.

Paid endpoints:
- POST /v1/preflight ($0.004): Preflight X/Twitter text posts and return ready, blockingReasons, retryableRequest, retryPolicy, and caveats.
- POST /v1/explain-failure ($0.004): Explain failed X create-post responses and return reasonCode, retryability, retryPolicy, and repair hints.
- POST /v1/crypto/risk-brief ($0.02): Generate an explainable crypto token risk brief from market/liquidity and token-security data before wallet approval, listing, or trading workflows.
- POST /v1/repair ($0.006): Repair invalid social publishing payloads and return corrected JSON plus a machine-readable diff.
- POST /v1/validate ($0.003): Validate X, LinkedIn, or Xiaohongshu payloads against deterministic publishing guardrails.
- POST /v1/compile ($0.01): Compile source content into social publishing payloads with validation reports.

Free discovery endpoints:
- Capabilities: https://api-production-853c.up.railway.app/v1/capabilities
- Free preflight demo: https://api-production-853c.up.railway.app/v1/demo/preflight
- OpenAPI: https://api-production-853c.up.railway.app/openapi.json
- Examples: https://api-production-853c.up.railway.app/v1/examples
- x402 manifest: https://api-production-853c.up.railway.app/.well-known/x402

Boundary: MatrixFold does not post to social accounts, execute trades, custody assets, or provide investment advice.