Whether a USDC transferWithAuthorization nonce of an authorizer has already been
Whether a USDC transferWithAuthorization nonce of an authorizer has already been used on Base, which is how an x402 buyer tells a settled payment from one that never landed, plus the authorizer's USDC balance.
Answeringour last check, 2026-10-25
1 of 1checks answered this week
487 msmedian answer time
$0.001listed price per call
$0.001price 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
GET https://base.kagurazaka.dev/v1/authorization
| Category | Market data |
|---|---|
| Provider host | base.kagurazaka.dev |
| 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 |
|---|---|---|---|---|
| 2026-10-25 | valid payment request | 402 | $0.001 | 487 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"authorizer": "0x5672C104c5A7F931843DD0b4Cc12BA0B525C7BCB",
"nonce": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"authorizer": {
"description": "the paying wallet (0x...)",
"type": "string"
},
"nonce": {
"description": "the authorization nonce (0x + 64 hex digits)",
"type": "string"
}
},
"required": [
"authorizer",
"nonce"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"usdc_balance": {},
"used": {}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}