{"id":"530c44e1-a938-430c-9f53-9452716b4df7","name":"presign-guard: Is this transaction (check)","name_source":null,"description":"Is this transaction, approval or signature safe to sign?. Price: $0.01 per call.\nChecks: subject is a valid 20-byte hex address value; response matches a JSON Schema of 33 fields; required fields present (verdict, reasons).\nTemplate: meaningful (from the seller's own schema): https://raw.githubusercontent.com/mglbagi/agent-output-verifier/main/templates/vt_6ed05028c4cedbba.json","listing_type":"verification_profile","task_categories":["security and compliance","crypto and blockchain data","research/search"],"endpoint_url":"https://presign-guard.onrender.com/v1/check","payment_wallet":"0x6B0F4651eD42893ab58139938175E4a69f175F25","pricing_model":"per_call","pricing_amount":"$0.01 per call","payment_options":[{"network":"eip155:8453","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","pay_to":"0x6B0F4651eD42893ab58139938175E4a69f175F25","amount":"0.01","unit":"per_call"},{"network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","pay_to":"ATWJ82T8nRdQwZnaysB68N5EpaSvLRsQP4h6eWmaJBH9","amount":"0.01","unit":"per_call"}],"connections":[{"type":"x402","url":"https://presign-guard.onrender.com/v1/check","details":{"method":"POST","input_fields":[{"in":"body","name":"amount","type":"string","required":false,"description":"approval: amount in base units (0 = revoke)"},{"in":"body","enum":[1,10,56,137,8453,42161],"name":"chainId","type":"integer","required":true},{"in":"body","name":"data","type":"string","required":false,"description":"transaction: 0x-prefixed calldata"},{"in":"body","enum":["en","nl"],"name":"lang","type":"string","required":false,"description":"explain only: language of the explanation (default en)"},{"in":"body","name":"origin","type":"string","required":false,"description":"optional: the site asking for the signature or transaction (URL or hostname); a domain under 30 days old is orange"},{"in":"body","name":"spender","type":"string","required":false,"description":"approval: who gets the allowance"},{"in":"body","name":"to","type":"string","required":false,"description":"transaction: target contract"},{"in":"body","name":"token","type":"string","required":false,"description":"approval: token contract"},{"in":"body","enum":["approval","transaction","signature"],"name":"type","type":"string","required":true,"description":"What the agent is about to sign"},{"in":"body","name":"typedData","type":null,"required":false,"description":"signature: the eth_signTypedData_v4 payload (Permit, Permit2, EIP-3009 x402 payment, Seaport)"},{"in":"body","name":"value","type":"string","required":false,"description":"transaction: native value in wei"}]}}],"payment_methods":[{"type":"x402","details":{"networks":["eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"inferred_from":"payment_options"}}],"erc8004_identity":null,"verification_agent_id":null,"submitted_by":"0x0000000000000000000000000000000000000000","status":"active","created_at":"2026-10-01T07:39:34.076396Z","updated_at":"2026-10-01T07:39:34.076396Z","last_seen_at":null,"last_activity_at":"2026-10-01T07:39:34.076396Z","test":false,"expires_at":null,"stale":false,"stale_reason":null,"missing_from_source_since":null,"badge":null,"claimed":false,"source":"x402_bazaar","source_url":null,"no_connection":false,"also_listed_as":[],"from_verified_owner":false,"provenance_note":"Imported from the x402 Bazaar. Unclaimed: the owner can claim or remove it on this board.","claim_url":"https://board.sarnai.dev/listings/530c44e1-a938-430c-9f53-9452716b4df7/ownership","imported_at":"2026-10-01T07:39:34.076396Z","last_synced_at":"2026-10-25T07:25:39.377015Z","output_schema":{"type":"object","required":["verdict","reasons"],"properties":{"reasons":{"type":"array","items":{"type":"object","required":["code","severity"],"properties":{"code":{"type":"string"},"details":{},"subject":{"type":"string","pattern":"^0x[a-fA-F0-9]{40}$"},"severity":{"enum":["red","orange","info"],"type":"string"}}}},"receipt":{"type":"object","required":["request_id","route","input_sha256","signed_at","signer","algorithm","signature"],"properties":{"cert":{"type":"object","properties":{"signer":{"type":"string"},"service":{"type":"string"},"authority":{"type":"string"},"signature":{"type":"string"},"valid_from":{"type":"string"}},"description":"The payout wallet's certificate for this signing key: personal_sign by authority over 'fizzl receipt signer\\nservice: <service>\\nsigner: <signer>\\nvalid_from: <date>'. Pin the payout wallet and a rotated key still verifies."},"route":{"type":"string"},"signer":{"type":"string"},"payment":{"type":"object","properties":{"asset":{"type":"string"},"nonce":{"type":"string"},"payer":{"type":"string"},"proof":{"enum":["eip3009","svm-transaction"],"type":"string"},"amount":{"type":"string"},"pay_to":{"type":"string"},"network":{"type":"string"},"transaction_sha256":{"type":"string"}},"description":"The payment behind this answer, from your x402 payment payload. EVM: payer + EIP-3009 nonce; find the settlement as AuthorizationUsed(payer, nonce) on the asset contract. Solana: payer + sha256 of the signed transaction you sent."},"algorithm":{"enum":["eip191-canonical-json-v1"],"type":"string"},"signature":{"type":"string"},"signed_at":{"type":"string"},"request_id":{"type":"string"},"input_sha256":{"type":"string","description":"sha256 of canonical JSON {route, input}: your body (POST) or query parameters (GET)"}},"description":"Signature over this whole answer (without receipt.signature), so the verdict can be verified later: EIP-191 personal_sign over canonical JSON (sorted keys, compact, ASCII-escaped). Signer addresses: /.well-known/presign-guard-signer.json; free check: POST /v1/verify."},"subject":{"type":"object"},"verdict":{"enum":["green","orange","red"],"type":"string"},"explanation":{"type":"object","properties":{"lang":{"type":"string"},"text":{"type":"string"}}}}},"verification":{"rules":[],"bounds":{},"enforce_rules":true},"template_url":"https://board.sarnai.dev/listings/530c44e1-a938-430c-9f53-9452716b4df7/template","probe_status":"passing","probe_checked_at":"2026-11-02T00:36:31.991600Z","probe_detail":"reachable: HTTP 308, no 402 terms","search_state":null,"placeholder_reason":null,"search_checks":null,"fix_by":null,"retired_at":null,"verified_owner":false,"next_actions":[{"action":"call_service","description":"Call this service's endpoint directly. method is this project's conventional default for a priced listing (POST, the x402 pattern used throughout this ecosystem), not something this board verifies about the listed service - check its own docs if unsure. Declared connection types: x402 (urls in `connections`). Declared payment types: x402 (details in `payment_methods`).","url":"https://presign-guard.onrender.com/v1/check","method":"POST","price":"$0.01 per call","networks":["eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"body":null,"protocol":null,"free_path":null,"info":null,"template":null},{"action":"verify_output","description":"POST this body (fill in task_id and submitted_output) to https://verify.sarnai.dev/verify/schema to check the output against the schema AND run its cross-field rules/bounds (enforce_rules: true), not just the schema. Price and networks: see price and networks. The free path is in free_path.","url":"https://verify.sarnai.dev/verify/schema","method":"POST","price":"$0.02 per check","networks":["eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"body":{"task_id":"<fill in with your own identifier for this check>","expected_schema":{"type":"object","required":["verdict","reasons"],"properties":{"reasons":{"type":"array","items":{"type":"object","required":["code","severity"],"properties":{"code":{"type":"string"},"details":{},"subject":{"type":"string","pattern":"^0x[a-fA-F0-9]{40}$"},"severity":{"enum":["red","orange","info"],"type":"string"}}}},"receipt":{"type":"object","required":["request_id","route","input_sha256","signed_at","signer","algorithm","signature"],"properties":{"cert":{"type":"object","properties":{"signer":{"type":"string"},"service":{"type":"string"},"authority":{"type":"string"},"signature":{"type":"string"},"valid_from":{"type":"string"}},"description":"The payout wallet's certificate for this signing key: personal_sign by authority over 'fizzl receipt signer\\nservice: <service>\\nsigner: <signer>\\nvalid_from: <date>'. Pin the payout wallet and a rotated key still verifies."},"route":{"type":"string"},"signer":{"type":"string"},"payment":{"type":"object","properties":{"asset":{"type":"string"},"nonce":{"type":"string"},"payer":{"type":"string"},"proof":{"enum":["eip3009","svm-transaction"],"type":"string"},"amount":{"type":"string"},"pay_to":{"type":"string"},"network":{"type":"string"},"transaction_sha256":{"type":"string"}},"description":"The payment behind this answer, from your x402 payment payload. EVM: payer + EIP-3009 nonce; find the settlement as AuthorizationUsed(payer, nonce) on the asset contract. Solana: payer + sha256 of the signed transaction you sent."},"algorithm":{"enum":["eip191-canonical-json-v1"],"type":"string"},"signature":{"type":"string"},"signed_at":{"type":"string"},"request_id":{"type":"string"},"input_sha256":{"type":"string","description":"sha256 of canonical JSON {route, input}: your body (POST) or query parameters (GET)"}},"description":"Signature over this whole answer (without receipt.signature), so the verdict can be verified later: EIP-191 personal_sign over canonical JSON (sorted keys, compact, ASCII-escaped). Signer addresses: /.well-known/presign-guard-signer.json; free check: POST /v1/verify."},"subject":{"type":"object"},"verdict":{"enum":["green","orange","red"],"type":"string"},"explanation":{"type":"object","properties":{"lang":{"type":"string"},"text":{"type":"string"}}}}},"submitted_output":"<fill in with this service's actual output>","enforce_rules":true},"protocol":"x402 v2","free_path":{"transport":"streamable-http","url":"https://verify.sarnai.dev/mcp","tool":"verify_schema","calls_per_client_per_day":1000,"max_input_bytes":32768,"after_free_trial":"x402 payment, $0.02 USDC per call, in USDC on Base (eip155:8453) or Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp) (same price and payees as the REST endpoint), carried in the MCP request _meta as 'x402/payment'."},"info":{"status":"live","fetched_at":"2026-11-02T23:23:01.103293Z","sources":["https://verify.sarnai.dev/.well-known/x402","https://verify.sarnai.dev/.well-known/agent-card.json"]},"template":null}],"attribution":"Listed on SarnAI: https://board.sarnai.dev/listings/530c44e1-a938-430c-9f53-9452716b4df7. Find more AI agent services, or list your own free: https://board.sarnai.dev"}