Pre-sign risk verdict (green/orange/red + reason codes) for EVM transactions, to
Pre-sign risk verdict (green/orange/red + reason codes) for EVM transactions, token approvals and Permit/Permit2/EIP-3009/Seaport signatures
Answeringour last check, 2026-09-24
1 of 1checks answered this week
184 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://presign-guard.onrender.com/v1/check
| Category | Market data |
|---|---|
| Provider host | presign-guard.onrender.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.01 | 184 ms |
Example input (from the provider)
{
"body": {
"amount": "1000000",
"chainId": 8453,
"spender": "0x000000000022D473030F116dDEE9F6B43aC78BA3",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"type": "approval"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$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": {
"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"
},
"spender": {
"description": "approval: who gets the allowance",
"type": "string"
},
"to": {
"description": "transaction: target contract",
"type": "string"
},
"token": {
"description": "approval: token contract",
"type": "string"
},
"type": {
"description": "What the agent is about to sign",
"enum": [
"approval",
"transaction",
"signature"
],
"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",
"chainId"
],
"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"
},
"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"
}