{"id":"x402-mcp-server","name":"x402-mcp-server","af_score":44.0,"security_score":43.0,"reliability_score":17.5,"what_it_does":"Provides an MCP server that implements an x402-style micropayment gateway for AI agents. It exposes MCP tools to create payment requests, verify USDC payments on Solana, query payment status/history, set per-tool pricing, and fetch revenue statistics.","best_when":"You want agent-to-agent paywalling for specific tools using on-chain USDC verification and are comfortable validating correctness/security in your own environment.","avoid_when":"You need clearly documented API contracts, guaranteed idempotency, or documented error/retry behavior for financial workflows.","last_evaluated":"2026-04-04T21:38:24.139343+00:00","has_mcp":true,"has_api":false,"auth_methods":["Environment-based configuration (MERCHANT_WALLET, SOLANA_RPC_URL)"],"has_free_tier":false,"known_gotchas":["No idempotency/retry guidance documented for payment creation/verification—agents may duplicate requests if they retry aggressively.","No explicit tool input/output schema or error code semantics provided in the README excerpt, making robust agent handling harder.","On-chain verification requires correct USDC/memo/payment parameters; incorrect setup could lead to false negatives/positives (not documented)."],"error_quality":0.0}