{"name":"SignCheck","description":"Pre-sign safety check for AI agent wallets: decodes a transaction, an EIP-712 signature request (Permit, Permit2, EIP-3009, Seaport), an EIP-7702 delegation or an x402 payment into plain English and flags what can drain the wallet, with on-chain facts and simulation. Paid per call over x402; free preview and remote MCP.","paid":[{"methods":["GET","POST"],"path":"/v1/check","price":"$0.015","network":"eip155:8453","asset":"USDC","payTo":"0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F","facilitator":"https://api.cdp.coinbase.com/platform/v2/x402","x402":["v2","v1"],"returns":"full: reasons, on-chain facts, eth_call simulation"},{"methods":["GET","POST"],"path":"/v1/lite","price":"$0.005","network":"eip155:8453","asset":"USDC","payTo":"0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F","facilitator":"https://api.cdp.coinbase.com/platform/v2/x402","x402":["v2","v1"],"returns":"offline: reasons, decoded args, counterparties, x402 match, OFAC SDN; no RPC"}],"free":["/health","/v1/preview","/mcp","/v1/stats","/openapi.json","/.well-known/x402"],"freeTier":{"preview":{"methods":["GET","POST"],"path":"/v1/preview","limit":"10 requests/min per IP","returns":"offline decode: verdict, summary and flag codes; no reasons, decoded args, on-chain facts (EOA vs contract, token metadata), simulation or x402 match details"},"mcp":{"method":"POST","path":"/mcp","transport":"streamable-http","tools":["check_signature"],"limit":"10 tool calls/min per IP (preview tier)"}},"inputs":{"chain":"base (default), ethereum, base-sepolia or a chain id","tx":"Transaction to send: {\"to\":\"0x…\",\"data\":\"0x…\",\"value\":\"0\",\"from\":\"0x…\"} (from enables simulation)","typed_data":"EIP-712 request {domain, types, primaryType, message} as passed to eth_signTypedData_v4","authorization":"EIP-7702 authorization {address (delegate contract), chainId, nonce}","payment_required":"x402 402 terms: the PAYMENT-REQUIRED header (base64) or JSON {accepts:[…]}","payment_payload":"x402 payment you are about to send: PAYMENT-SIGNATURE / X-PAYMENT (base64) or JSON"},"chains":{"onchain":["base (8453)","ethereum (1)","base-sepolia (84532)"],"decode_only":"any other EVM chain id"},"known_functions":27,"sanctions":{"list":"US Treasury OFAC Specially Designated Nationals (SDN) list","list_date":"2026-10-21","evm_addresses":124},"engine":"signcheck-0.1","policy":{"network":"paid tier: one batched JSON-RPC request to public RPCs (eth_getCode, token symbol/decimals, eth_call simulation) and, for unknown selectors, the public openchain 4-byte directory","storage":"nothing is stored or logged","charging":"only HTTP 200 results are settled; invalid input and RPC outages are free","signing":"read-only: SignCheck never asks for keys or signatures and never sends transactions"},"disclaimer":"Informational pre-sign check from public data and static rules, not a security guarantee or financial advice. A SAFE verdict means no known-bad pattern was found; always confirm the counterparty yourself.","source":"https://agentgate-source.pages.dev/x402-signcheck/","allTools":"https://youraitools.co/built-by-us","npm":"https://www.npmjs.com/package/@agentgate-builder/signcheck","endpoint":"https://signcheck.agentgate.workers.dev","networks":[{"network":"eip155:8453","name":"Base","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","symbol":"USDC","payTo":"0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F"},{"network":"eip155:137","name":"Polygon","asset":"0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359","symbol":"USDC","payTo":"0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F"},{"network":"eip155:42161","name":"Arbitrum One","asset":"0xaf88d065e77c8cC2239327C5EDb3A432268e5831","symbol":"USDC","payTo":"0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F"},{"network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","name":"Solana","asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","symbol":"USDC","payTo":"FH73WbbUe2UyNzfy72MJs5nT3NxyDf9GrqE7kzjL2Jte"}]}