Linear two-step evidence pipeline for the Permit2 asset-transfer method of an x402 exact or upto payment, the sibling of the EIP-3009 pipeline. The first step recomputes the Permit2 typed-data digest the payer signed and reports the binding, window, nonce-space and signature-form facts around it; the second step recovers the signer from that digest and reports whether the recovered address matches the claimed payer. The two outputs compose into an evidence pack a downstream agent or a human reads before relying on an authorization. This is an evidence bundle and never a settlement proof: no chain is read, nothing is submitted, and any fact whose input was not declared reports NOT_EVALUATED.
recompute_x402_permit2_digest{
"jsonrpc": "2.0",
"method": "tools/call",
"params": {
"name": "recompute_x402_permit2_digest",
"arguments": {}
},
"id": 1
}
verify_x402_signer_recovery{
"jsonrpc": "2.0",
"method": "tools/call",
"params": {
"name": "verify_x402_signer_recovery",
"arguments": {}
},
"id": 1
}