Attest a decision
Attest a decision: sign (input_hash, output_hash, decision) yourself, or omit the signature and the treasury signs — then dual-chain anchor. Free re-verify at /v1/attest/verify. $0.01 USDC.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
807 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://api.anchor-x402.com/v1/attest
| Category | Everything else |
|---|---|
| Provider host | api.anchor-x402.com |
| Networks | eip155:137, eip155:5042, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.01 | 807 ms |
Example input (from the provider)
{
"body": {
"decision": "APPROVED",
"input_hash": "ab0898397c86fbf97c99c6f8b29e55ab697315705777ee1d106e2dcb9bd686b3",
"output_hash": "121bff3514725274e35bf3407fec31b5bbf458ee89ae8b75f3a01492f8a9ecef"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"decision": {
"description": "Free-form short label.",
"maxLength": 64,
"type": "string"
},
"input_hash": {
"description": "64-char hex SHA-256 of the agent's input.",
"type": "string"
},
"output_hash": {
"description": "64-char hex SHA-256 of the agent's output / decision payload.",
"type": "string"
},
"scheme": {
"enum": [
"eip191",
"ed25519"
],
"type": "string"
},
"signature": {
"description": "0x-prefixed hex (eip191) or base58 (ed25519).",
"type": "string"
},
"signer_pubkey": {
"description": "Required for ed25519. Ignored for eip191.",
"type": "string"
}
},
"required": [
"input_hash",
"output_hash",
"decision"
]
},
"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"
},
"output": {
"properties": {
"example": {
"properties": {
"base": {
"anyOf": [
{
"properties": {
"explorer_url": {
"type": "string"
},
"tx": {
"type": "string"
}
},
"required": [
"tx",
"explorer_url"
],
"type": "object"
},
{
"type": "null"
}
]
},
"decision": {
"type": "string"
},
"merkle_root": {
"type": "string"
},
"signed_at": {
"type": "integer"
},
"signed_by": {
"type": "string"
},
"signer": {
"type": "string"
},
"signer_verified": {
"type": "boolean"
},
"solana": {
"anyOf": [
{
"properties": {
"explorer_url": {
"type": "string"
},
"tx": {
"type": "string"
}
},
"required": [
"tx",
"explorer_url"
],
"type": "object"
},
{
"type": "null"
}
]
},
"verify_url": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
}
},
"required": [
"merkle_root",
"signer_verified",
"signer",
"decision",
"signed_at"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}