Assert an agent's output — JSON schema, terms, lengths, citations, quotes in a s
Assert an agent's output — JSON schema, terms, lengths, citations, quotes in a source; a signed record. GET ?text=&checks=
Answeringour last check, 2026-10-10
1 of 1checks answered this week
657 msmedian answer time
$0.005listed price per call
$0.005price 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://api.s2ar.dev/x402/v1/assert
| Category | Code and developer |
|---|---|
| Provider host | api.s2ar.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 |
|---|---|---|---|---|
| 2026-10-10 | valid payment request | 402 | $0.005 | 657 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"checks": "[{\"check\":\"json_valid\"},{\"check\":\"required_keys\",\"keys\":[\"summary\",\"source_url\"]},{\"check\":\"citations_present\",\"min\":1}]",
"text": "{\"summary\": \"The glob flag is parsed in defs.rs\", \"source_url\": \"https://github.com/BurntSushi/ripgrep\"}"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"additionalProperties": {
"type": "string"
},
"properties": {
"checks": {
"description": "the checks; on GET, a JSON list in one parameter",
"type": "string"
},
"rubric": {
"description": "a named check list; `schema`, `domains` fill its slots",
"type": "string"
},
"schema": {
"description": "for json_schema / api-response",
"type": "string"
},
"source": {
"description": "the source for quotes_in_source",
"type": "string"
},
"text": {
"description": "the output to assert (or `json`, an object)",
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"queryParams"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}