Check an x402 seller before paying: verdict, failure rate and evidence from paid calls on Base.
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Call this before paying any x402 seller, before retrying a request that returned 402, or when the user names an API they intend to pay per call. Returns a verdict (avoid, caution, ok, unknown), one sentence to act on, the seller's paid-call count and failure rate with a 95% interval, listed price, modal quote and max overcharge ratio when known, and links to the seller page and raw evidence.
x402 resource URL, or a bare seller domain such as api.example.com
Call this before paying any x402 seller, before retrying a request that returned 402, or when the user names an API they intend to pay per call. Returns a verdict (avoid, caution, ok, unknown), one sentence to act on, the seller's paid-call count and failure rate with a 95% interval, listed price, modal quote and max overcharge ratio when known, and links to the seller page and raw evidence.
| Argument | Type | Description |
|---|---|---|
| url* | string | x402 resource URL, or a bare seller domain such as api.example.com |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"minLength": 1,
"description": "x402 resource URL, or a bare seller domain such as api.example.com"
}
}
}Call this when choosing which x402 seller to use for a task, or when the user asks for a safe or reliable API. Returns sellers with zero failures across at least 30 paid calls, most-called first; optional category filter (inference, data, scraping, compute, other).
| Argument | Type | Description |
|---|---|---|
| limit | integer | Max rows, default 50 |
| category | string | Restrict to one category |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"limit": {
"type": "integer",
"maximum": 500,
"minimum": 1,
"description": "Max rows, default 50"
},
"category": {
"enum": [
"inference",
"data",
"scraping",
"compute",
"other"
],
"type": "string",
"description": "Restrict to one category"
}
}
}Call this when the user asks what changed for an x402 seller or in the index, or before relying on a verdict older than a day. Returns recent changes, newest first: verdict changes, new failures by type, moved quotes, changed pay-to addresses, sellers added or reaching 30 paid calls, published seller replies, the operator-reported series maturing or disagreeing with ours; optional host filter and since (ISO time).
| Argument | Type | Description |
|---|---|---|
| host | string | Only this seller, a bare domain such as api.example.com |
| since | string | Only changes after this ISO 8601 time |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"host": {
"type": "string",
"minLength": 1,
"description": "Only this seller, a bare domain such as api.example.com"
},
"since": {
"type": "string",
"minLength": 1,
"description": "Only changes after this ISO 8601 time"
}
}
}