# Council of AI — USDC Asset Measurement Card Retrieval

> Council of AI — USDC Asset Measurement Card Retrieval is a paid API for AI agents from councilof.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Returns signed measurement cards and parity state for the USDC asset as assessed by the Council of AI independent evaluation system.

## Facts

- Endpoint: GET https://councilof.ai/api/wrapper/asset/usdc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/council-of-ai-usdc-asset-measurement-card-retrieval-b507a6ba
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__zwip4aEWgn9LoDYZR84t

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-usdc-asset-measurement-card-retrieval-b507a6ba
```

Example prompt: Pull the latest Council of AI signed measurement cards for USDC — I want to see the parity state, the ed25519 signatures, and whether there are any unmeasured pairs.

## When to prefer this

Use this endpoint when you need cryptographically verifiable, signed measurement evidence for the USDC asset specifically from an independent third-party AI evaluation body. Prefer this over generic AI benchmarks when you need checkable, tamper-evident audit cards with ed25519 signatures and SHA256 hashes that can be independently re-verified against the Council of AI published test corpus and corrections ledger.

## Known failure modes

- Payment not made or x402 payment header missing — returns 402 Payment Required
- Asset not found or no cards issued yet — may return empty cards array
- Signature null on supporting runs that have not been formally signed — cards labelled as unsigned
- Network or server error — standard HTTP 5xx response
- Malformed request method (only GET, HEAD, DELETE accepted) — returns 405 Method Not Allowed

## How this service works

We measure how AI systems behave against frozen, published tests and publish checkable evidence. Issued measurement cards are signed; unsigned supporting runs are labelled. Read the live board and corrections ledger.

## Output

Returns a JSON pack containing: the asset identifier (USDC), an array of signed measurement cards (each with schema URL, SHA256 hash, payload describing kind and state, surface label, and an ed25519 signature or null if unsigned), aggregate counts by state, the pack-level SHA256 hash, and a list of any unmeasured pairs. All cards reference the csoai.wrapper-asset-pack/0.1 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"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "asset": "USDC",
  "cards": [
   {
    "schema": "https://councilof.ai/schema/card-v0.json",
    "sha256": "<hex>",
    "payload": {
     "kind": "csoai.wrapper.parity/0.1",
     "state": "ESCROW_PARITY_READ"
    },
    "surface": "public.notice",
    "sig_ed25519": "<hex or null>"
   }
  ],
  "counts": {
   "ESCROW_PARITY_READ": 1
  },
  "schema": "csoai.wrapper-asset-pack/0.1",
  "pack_sha256": "<hex>",
  "unmeasured_pairs": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/council-of-ai-usdc-asset-measurement-card-retrieval-b507a6ba/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)