# Council of AI — GSPC Attestation & Claim Verification

> Council of AI — GSPC Attestation & Claim Verification is a paid API for AI agents from councilof.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Commissions or retrieves a signed GSPC attestation card for an AI model, instrument, or subject, returning its measurement status and axis scores.

## Facts

- Endpoint: GET https://councilof.ai/api/request-attestation
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/council-of-ai-gspc-attestation-claim-verification-345ac05b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F9eelAxqn06cx1fnY-yjS

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability council-of-ai-gspc-attestation-claim-verification-345ac05b
```

Example prompt: Check the Council of AI GSPC attestation status for GPT-4o — I want to see whether it's been measured and what the signed card says.

## When to prefer this

Use this endpoint when you need to programmatically verify or retrieve a signed GSPC attestation for a specific AI model, instrument, or card hash — particularly when you want axis-level detail or a cryptographically signed result. Prefer this over the free CSOAI door endpoint when you need per-subject or per-axis granularity rather than aggregate board totals.

## Known failure modes

- Missing required 'subject' query parameter returns a validation error
- Unknown or unrecognized subject ID returns an empty or null card
- Axis slug not found for subject returns unmeasured status for that axis
- Payment not completed (402) blocks access to the commissioned result
- Card sha does not match any known signed card, returning null signature

## How this service works

Explore the current GSPC measurements, see the published change record, verify signed evidence, and access the supported public feeds.

## Output

Returns a JSON attestation card with: the subject identifier, GSPC status (e.g. COMMISSIONED, UNMEASURED), reserve scores, a list of unmeasured axes, the surface slug, and an ed25519 hex signature (or null if unsigned). The card conforms to the councilof.ai card-v0 schema.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "subject"
     ],
     "properties": {
      "axis": {
       "type": "string",
       "description": "Optional axis slug; omit for the subject-level commission"
      },
      "subject": {
       "type": "string",
       "description": "Subject to commission (model id, instrument id, or card sha)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "schema": "https://councilof.ai/schema/card-v0.json",
  "payload": {
   "status": "COMMISSIONED",
   "reserve": [],
   "fresh_run": "UNMEASURED"
  },
  "subject": "model-or-subject-id",
  "surface": "ras.commission",
  "unmeasured": [
   "root_inclusion"
  ],
  "sig_ed25519": "<hex or null>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/council-of-ai-gspc-attestation-claim-verification-345ac05b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from councilof.ai](https://www.zero.xyz/host/councilof.ai/llms.txt)