Checks vouchers of a payment channel by computation only
Checks vouchers of a payment channel by computation only - nothing is ever claimed, redeemed or refunded. Signatures are verified cryptographically against the address each voucher claims to be signed by, in EIP-712 form when the typed data is supplied, otherwise as a plain message signature. Double spending is the expensive case and is checked in full: every voucher id occurring more than once is reported with all its occurrences and whether the duplicates agree on the amount. Sums are added up
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://x402.halowerk.com/channel/audit
| Category | Code and developer |
|---|---|
| Provider host | x402.halowerk.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 | $0.006 | 1184 ms |
Example input (from the provider)
{
"body": {
"vouchers": [
{
"amount": "1000000",
"id": "beispiel",
"signed_by": "beispiel"
}
]
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"chain": {
"description": "Optional chain, needed only to read the on-chain state, as CAIP-2 such as eip155:8453.",
"type": "string"
},
"channel_contract": {
"description": "Optional channel contract address.",
"type": "string"
},
"channel_id": {
"description": "Optional channel identifier as bytes32.",
"type": "string"
},
"deposited": {
"description": "Optional deposit in the smallest unit, used when the contract cannot be read.",
"type": "string"
},
"vouchers": {
"description": "The vouchers to audit.",
"items": {
"additionalProperties": false,
"properties": {
"amount": {
"description": "Amount in the smallest unit, as a decimal string.",
"type": "string"
},
"claimed": {
"description": "Whether the caller considers this voucher already claimed.",
"type": "boolean"
},
"expiry": {
"description": "Optional expiry as a unix timestamp in seconds.",
"type": "string"
},
"id": {
"description": "Voucher identifier.",
"type": "string"
},
"message": {
"description": "The signed message, for a plain message signature.",
"type": "string"
},
"signature": {
"description": "The signature, 0x-prefixed.",
"type": "string"
},
"signed_by": {
"description": "Address that is claimed to have signed.",
"type": "string"
},
"typed_data": {
"description": "EIP-712 payload with domain, types, primaryType and message.",
"type": "object"
}
},
"required": [
"id",
"amount"
],
"type": "object"
},
"maxItems": 200,
"minItems": 1,
"type": "array"
}
},
"required": [
"vouchers"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}