{ "x402Version": 2, "id": 34929, "slug": "34929", "resource": "https://presign-guard.fizzl.eu/v1/check/explain", "description": "Is this transaction, approval or signature safe to sign, explained for a person? The same pre-sign verdict as /v1/check (green/orange/red + reason codes) plus a short plain-language explanation in English or Dutch, for an agent to show its user before asking for approval. Bulk: 100 checks for $0.80 via /v1/credits.", "type": "http", "serviceName": "presign-guard", "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1791125199/bazaar-icons/dae343325dc2ef3d.png", "resourceType": "Payments", "accepts": [ { "scheme": "exact", "network": "eip155:8453", "payTo": "0x6B0F4651eD42893ab58139938175E4a69f175F25", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "amount": "30000", "amountUsd": 0.03, "maxTimeoutSeconds": 300 }, { "scheme": "exact", "network": "xrpl:0", "payTo": "r9xmBsRr8Ao7jRgjjxreMiAwGiCK2FGwqw", "asset": "524C555344000000000000000000000000000000", "amount": "0.03", "maxTimeoutSeconds": 300 }, { "scheme": "exact", "network": "algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=", "payTo": "LOYVFSQ6ZTS2YWUW4GQ5L6VPP2TPIOXWYDACK53CPOHQQHLDMEMKJDXAX4", "asset": "31566704", "amount": "30000", "maxTimeoutSeconds": 300 } ], "outputSchema": { "properties": { "example": { "properties": { "explanation": { "properties": { "lang": { "type": "string" }, "text": { "type": "string" } }, "type": "object" }, "reasons": { "items": { "properties": { "code": { "type": "string" }, "details": {}, "severity": { "enum": [ "red", "orange", "info" ], "type": "string" }, "subject": { "type": "string" } }, "required": [ "code", "severity" ], "type": "object" }, "type": "array" }, "receipt": { "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.", "properties": { "algorithm": { "enum": [ "eip191-canonical-json-v1" ], "type": "string" }, "cert": { "description": "The payout wallet's certificate for this signing key: personal_sign by authority over 'fizzl receipt signer\\nservice: \\nsigner: \\nvalid_from: '. Pin the payout wallet and a rotated key still verifies.", "properties": { "authority": { "type": "string" }, "service": { "type": "string" }, "signature": { "type": "string" }, "signer": { "type": "string" }, "valid_from": { "type": "string" } }, "type": "object" }, "input_sha256": { "description": "sha256 of canonical JSON {route, input}: your body (POST) or query parameters (GET)", "type": "string" }, "payment": { "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.", "properties": { "amount": { "type": "string" }, "asset": { "type": "string" }, "network": { "type": "string" }, "nonce": { "type": "string" }, "pay_to": { "type": "string" }, "payer": { "type": "string" }, "proof": { "enum": [ "eip3009", "svm-transaction" ], "type": "string" }, "transaction_sha256": { "type": "string" } }, "type": "object" }, "request_id": { "type": "string" }, "route": { "type": "string" }, "signature": { "type": "string" }, "signed_at": { "type": "string" }, "signer": { "type": "string" } }, "required": [ "request_id", "route", "input_sha256", "signed_at", "signer", "algorithm", "signature" ], "type": "object" }, "subject": { "type": "object" }, "verdict": { "enum": [ "green", "orange", "red" ], "type": "string" } }, "required": [ "verdict", "reasons" ], "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" }, "extensions": { "bazaar": { "info": { "input": { "body": { "amount": "1000000", "chainId": 8453, "spender": "0x000000000022D473030F116dDEE9F6B43aC78BA3", "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "type": "approval" }, "bodyType": "json", "method": "POST", "type": "http" }, "output": { "example": { "reasons": [ { "code": "UNLIMITED_APPROVAL", "details": { "token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913" }, "severity": "orange", "subject": "0x000000000022d473030f116ddee9f6b43ac78ba3" } ], "verdict": "orange" }, "type": "json" } }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "body": { "properties": { "amount": { "description": "approval: amount in base units (0 = revoke)", "type": "string" }, "chainId": { "description": "EVM chain; required for approval, transaction and signature", "enum": [ 1, 10, 56, 137, 8453, 42161 ], "type": "integer" }, "data": { "description": "transaction: 0x-prefixed calldata", "type": "string" }, "lang": { "description": "explain only: language of the explanation (default en)", "enum": [ "en", "nl" ], "type": "string" }, "mandate": { "description": "optional, EIP-3009 payments only: the spending mandate the agent pays under (x402 authority extension, x402-mandate/1): { mandate, alg: \"Ed25519\", sig, paymentId }. Outside it (over perPayment or cap, other recipient, payer or token, expired, bad signature, nonce not the mandate binding) is red", "type": "object" }, "network": { "description": "xrpl: the ledger (default xrpl:0, mainnet)", "enum": [ "xrpl:0", "xrpl:1" ], "type": "string" }, "origin": { "description": "optional: the site asking for the signature or transaction (URL or hostname); a domain under 30 days old is orange", "type": "string" }, "spender": { "description": "approval: who gets the allowance", "type": "string" }, "to": { "description": "transaction: target contract", "type": "string" }, "token": { "description": "approval: token contract", "type": "string" }, "tx": { "description": "xrpl: the unsigned transaction JSON (TransactionType, Account, ...). Red: SetRegularKey/SignerListSet to another key, disabling the master key, AccountDelete, fake RLUSD; orange: partial payments, destinations that refuse or need a tag, issuers that can claw back or freeze, escrows and NFT giveaways", "type": "object" }, "type": { "description": "What the agent is about to sign (xrpl: an XRP Ledger transaction)", "enum": [ "approval", "transaction", "signature", "xrpl" ], "type": "string" }, "typedData": { "description": "signature: the eth_signTypedData_v4 payload (Permit, Permit2, EIP-3009 x402 payment, Seaport)", "type": [ "object", "string" ] }, "value": { "description": "transaction: native value in wei", "type": "string" } }, "required": [ "type" ], "type": "object" }, "bodyType": { "enum": [ "json", "form-data", "text" ], "type": "string" }, "method": { "enum": [ "POST" ], "type": "string" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method", "bodyType", "body" ], "type": "object" }, "output": { "properties": { "example": { "properties": { "explanation": { "properties": { "lang": { "type": "string" }, "text": { "type": "string" } }, "type": "object" }, "reasons": { "items": { "properties": { "code": { "type": "string" }, "details": {}, "severity": { "enum": [ "red", "orange", "info" ], "type": "string" }, "subject": { "type": "string" } }, "required": [ "code", "severity" ], "type": "object" }, "type": "array" }, "receipt": { "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.", "properties": { "algorithm": { "enum": [ "eip191-canonical-json-v1" ], "type": "string" }, "cert": { "description": "The payout wallet's certificate for this signing key: personal_sign by authority over 'fizzl receipt signer\\nservice: \\nsigner: \\nvalid_from: '. Pin the payout wallet and a rotated key still verifies.", "properties": { "authority": { "type": "string" }, "service": { "type": "string" }, "signature": { "type": "string" }, "signer": { "type": "string" }, "valid_from": { "type": "string" } }, "type": "object" }, "input_sha256": { "description": "sha256 of canonical JSON {route, input}: your body (POST) or query parameters (GET)", "type": "string" }, "payment": { "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.", "properties": { "amount": { "type": "string" }, "asset": { "type": "string" }, "network": { "type": "string" }, "nonce": { "type": "string" }, "pay_to": { "type": "string" }, "payer": { "type": "string" }, "proof": { "enum": [ "eip3009", "svm-transaction" ], "type": "string" }, "transaction_sha256": { "type": "string" } }, "type": "object" }, "request_id": { "type": "string" }, "route": { "type": "string" }, "signature": { "type": "string" }, "signed_at": { "type": "string" }, "signer": { "type": "string" } }, "required": [ "request_id", "route", "input_sha256", "signed_at", "signer", "algorithm", "signature" ], "type": "object" }, "subject": { "type": "object" }, "verdict": { "enum": [ "green", "orange", "red" ], "type": "string" } }, "required": [ "verdict", "reasons" ], "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" } }, "required": [ "input" ], "type": "object" } } }, "tags": [ "wallet-security", "pre-sign", "approvals", "sanctions", "agents", "bazaar" ], "sourceHost": "presign-guard.fizzl.eu", "lastUpdated": "2026-10-08T06:26:13.09Z", "quality": { "calls30d": 2, "uniquePayers30d": 2, "lastCalledAt": "2026-10-08T06:26:12.555Z" }, "metadata": { "serviceName": "presign-guard", "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1791125199/bazaar-icons/dae343325dc2ef3d.png", "extensions": { "bazaar": { "info": { "input": { "body": { "amount": "1000000", "chainId": 8453, "spender": "0x000000000022D473030F116dDEE9F6B43aC78BA3", "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "type": "approval" }, "bodyType": "json", "method": "POST", "type": "http" }, "output": { "example": { "reasons": [ { "code": "UNLIMITED_APPROVAL", "details": { "token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913" }, "severity": "orange", "subject": "0x000000000022d473030f116ddee9f6b43ac78ba3" } ], "verdict": "orange" }, "type": "json" } }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "body": { "properties": { "amount": { "description": "approval: amount in base units (0 = revoke)", "type": "string" }, "chainId": { "description": "EVM chain; required for approval, transaction and signature", "enum": [ 1, 10, 56, 137, 8453, 42161 ], "type": "integer" }, "data": { "description": "transaction: 0x-prefixed calldata", "type": "string" }, "lang": { "description": "explain only: language of the explanation (default en)", "enum": [ "en", "nl" ], "type": "string" }, "mandate": { "description": "optional, EIP-3009 payments only: the spending mandate the agent pays under (x402 authority extension, x402-mandate/1): { mandate, alg: \"Ed25519\", sig, paymentId }. Outside it (over perPayment or cap, other recipient, payer or token, expired, bad signature, nonce not the mandate binding) is red", "type": "object" }, "network": { "description": "xrpl: the ledger (default xrpl:0, mainnet)", "enum": [ "xrpl:0", "xrpl:1" ], "type": "string" }, "origin": { "description": "optional: the site asking for the signature or transaction (URL or hostname); a domain under 30 days old is orange", "type": "string" }, "spender": { "description": "approval: who gets the allowance", "type": "string" }, "to": { "description": "transaction: target contract", "type": "string" }, "token": { "description": "approval: token contract", "type": "string" }, "tx": { "description": "xrpl: the unsigned transaction JSON (TransactionType, Account, ...). Red: SetRegularKey/SignerListSet to another key, disabling the master key, AccountDelete, fake RLUSD; orange: partial payments, destinations that refuse or need a tag, issuers that can claw back or freeze, escrows and NFT giveaways", "type": "object" }, "type": { "description": "What the agent is about to sign (xrpl: an XRP Ledger transaction)", "enum": [ "approval", "transaction", "signature", "xrpl" ], "type": "string" }, "typedData": { "description": "signature: the eth_signTypedData_v4 payload (Permit, Permit2, EIP-3009 x402 payment, Seaport)", "type": [ "object", "string" ] }, "value": { "description": "transaction: native value in wei", "type": "string" } }, "required": [ "type" ], "type": "object" }, "bodyType": { "enum": [ "json", "form-data", "text" ], "type": "string" }, "method": { "enum": [ "POST" ], "type": "string" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method", "bodyType", "body" ], "type": "object" }, "output": { "properties": { "example": { "properties": { "explanation": { "properties": { "lang": { "type": "string" }, "text": { "type": "string" } }, "type": "object" }, "reasons": { "items": { "properties": { "code": { "type": "string" }, "details": {}, "severity": { "enum": [ "red", "orange", "info" ], "type": "string" }, "subject": { "type": "string" } }, "required": [ "code", "severity" ], "type": "object" }, "type": "array" }, "receipt": { "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.", "properties": { "algorithm": { "enum": [ "eip191-canonical-json-v1" ], "type": "string" }, "cert": { "description": "The payout wallet's certificate for this signing key: personal_sign by authority over 'fizzl receipt signer\\nservice: \\nsigner: \\nvalid_from: '. Pin the payout wallet and a rotated key still verifies.", "properties": { "authority": { "type": "string" }, "service": { "type": "string" }, "signature": { "type": "string" }, "signer": { "type": "string" }, "valid_from": { "type": "string" } }, "type": "object" }, "input_sha256": { "description": "sha256 of canonical JSON {route, input}: your body (POST) or query parameters (GET)", "type": "string" }, "payment": { "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.", "properties": { "amount": { "type": "string" }, "asset": { "type": "string" }, "network": { "type": "string" }, "nonce": { "type": "string" }, "pay_to": { "type": "string" }, "payer": { "type": "string" }, "proof": { "enum": [ "eip3009", "svm-transaction" ], "type": "string" }, "transaction_sha256": { "type": "string" } }, "type": "object" }, "request_id": { "type": "string" }, "route": { "type": "string" }, "signature": { "type": "string" }, "signed_at": { "type": "string" }, "signer": { "type": "string" } }, "required": [ "request_id", "route", "input_sha256", "signed_at", "signer", "algorithm", "signature" ], "type": "object" }, "subject": { "type": "object" }, "verdict": { "enum": [ "green", "orange", "red" ], "type": "string" } }, "required": [ "verdict", "reasons" ], "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" } }, "required": [ "input" ], "type": "object" } } } }, "liveness": { "reliability": null }, "verified": false, "featured": false, "provider": { "host": "presign-guard.fizzl.eu", "manifest_name": "presign-guard.fizzl.eu", "source": "cdp-mirror", "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources", "submitted_at": "2026-10-13T15:56:53.641Z" }, "exampleResponse": { "example": { "explanation": { "lang": "string", "text": "string" }, "reasons": [ { "code": "string", "details": null, "severity": "red", "subject": "string" } ], "receipt": { "algorithm": "eip191-canonical-json-v1", "cert": { "authority": "string", "service": "string", "signature": "string", "signer": "string", "valid_from": "string" }, "input_sha256": "string", "payment": { "amount": "string", "asset": "string", "network": "string", "nonce": "string", "pay_to": "string", "payer": "string", "proof": "eip3009", "transaction_sha256": "string" }, "request_id": "string", "route": "string", "signature": "string", "signed_at": "string", "signer": "string" }, "subject": {}, "verdict": "green" }, "type": "string" } }