guild_preflight

io.github.AgentTanuki/x402-payment-safety · Verify this server

Run this in the moment BEFORE you delegate to, or pay, an agent endpoint you did not write. Free, no key, one call. Separates what the endpoint CLAIMS from what it just PROVED, live. Measured across the live ecosystem on 2026-07-31: 92.9% of registry-listed agents report healthy but only 33.9% actually complete a task; 0.8% sign their Agent Card; and of agents advertising payment, 5.7% actually return a 402. x402 `exact` transfers are irreversible, so this has to happen before the payment, not after it. Unlike a directory badge this is not cached and not derived from a repository at publication time — a server can change its tool descriptions after any one-off review. Checks it could not perform are returned as `unknowns` and are excluded from the verdict rather than averaged into it. Example: guild_preflight(url="https://some-agent.example/a2a")