Verify a Sign-In with Ethereum (EIP-4361) login
Verify a Sign-In with Ethereum (EIP-4361) login: parses domain, address, chain, nonce and dates, checks the signature and expiry, and optionally the expected domain and nonce. Authenticate users or agents by wallet.
Answeringour last check, 2026-10-03
1 of 1checks answered this week
350 msmedian answer time
$0.003listed price per call
$0.003price 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.vextorium.com/siwe-verificar-pago
| Category | Market data |
|---|---|
| Provider host | api.vextorium.com |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| 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 |
|---|---|---|---|---|
| 2026-10-03 | valid payment request | 402 | $0.003 | 350 ms |
Example input (from the provider)
{
"body": {
"firma": "0xcc7863e87c5879d5fd0bb7b2bc925ec0f86f59a07badb05d8faffec9b061d18a6227988b56b1e18b7a0603d034a7c5b378f5b039e0af9c929bf090ded43dd5941c",
"mensaje": "example.com wants you to sign in with your Ethereum account:\n0x7E5F4552091A69125d5DfCb7b8C2659029395Bdf\n\nSign in\n\nURI: https://example.com\nVersion: 1\nChain ID: 8453\nNonce: abc12345\nIssued At: 2026-10-02T20:00:00Z"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"dominio": {
"type": "string"
},
"firma": {
"type": "string"
},
"mensaje": {
"type": "string"
},
"nonce": {
"type": "string"
}
},
"required": [
"mensaje",
"firma"
]
},
"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": {
"cadena": {
"type": [
"string",
"null"
]
},
"caduca": {},
"declaracion": {
"type": [
"string",
"null"
]
},
"direccion": {
"type": [
"string",
"null"
]
},
"dominio": {
"type": [
"string",
"null"
]
},
"emitido": {
"type": [
"string",
"null"
]
},
"errores": {
"items": {},
"type": [
"array",
"null"
]
},
"nonce": {
"type": [
"string",
"null"
]
},
"uri": {
"type": [
"string",
"null"
]
},
"valido": {
"type": [
"boolean",
"null"
]
}
},
"type": [
"object",
"null"
]
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}