Decode what an EVM payment authorization actually authorizes before signing
Decode what an EVM payment authorization actually authorizes before signing.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
830 msmedian answer time
$0.005listed price per call
$0.005price 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://api-staging.vapinetwork.ai/x402/decode
| Category | Everything else |
|---|---|
| Provider host | api-staging.vapinetwork.ai |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 830 ms |
Example input (from the provider)
{
"body": {
"typedData": "{\"domain\":{},\"types\":{\"X\":[]},\"primaryType\":\"X\",\"message\":{}}"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"signature": {
"type": "string"
},
"typedData": {
"description": "JSON string of the EIP-712 typed data",
"type": "string"
}
},
"required": [
"typedData"
],
"type": "object"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"additionalProperties": false,
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"amountAtomic": {
"type": [
"string",
"null"
]
},
"amountFormatted": {
"type": [
"string",
"null"
]
},
"amountSymbol": {
"type": [
"string",
"null"
]
},
"chainId": {
"type": [
"integer",
"null"
]
},
"nonce": {
"type": [
"string",
"null"
]
},
"owner": {
"type": [
"string",
"null"
]
},
"primaryType": {
"type": "string"
},
"signer": {
"type": [
"string",
"null"
]
},
"spenderOrRecipient": {
"type": [
"string",
"null"
]
},
"standard": {
"type": "string"
},
"token": {
"type": [
"string",
"null"
]
},
"validity": {
"type": "object"
},
"verifyingContract": {
"type": [
"string",
"null"
]
},
"warnings": {
"items": {
"type": "object"
},
"type": "array"
}
},
"required": [
"standard",
"primaryType",
"token",
"verifyingContract",
"chainId",
"spenderOrRecipient",
"owner",
"amountAtomic",
"amountFormatted",
"amountSymbol",
"validity",
"nonce",
"signer",
"warnings"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}