# Council of AI — USDT Wrapper Asset Measurement Card

> Council of AI — USDT Wrapper Asset Measurement Card 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).

Retrieves signed measurement cards and parity state data for the USDT stablecoin asset as evaluated by the Council of AI independent measurement framework.

## Facts

- Endpoint: GET https://councilof.ai/api/wrapper/asset/usdt?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-usdt-wrapper-asset-measurement-card-c7df19d1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fNDWIDO6uE9YpfV-47qa8

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-usdt-wrapper-asset-measurement-card-c7df19d1
```

Example prompt: Pull the signed measurement cards for USDT from Council of AI so I can check the current parity state and verify the cryptographic signatures on the evidence.

## When to prefer this

Use this endpoint when you need cryptographically signed, independently verifiable measurement evidence specifically for the USDT stablecoin asset from the Council of AI framework. Prefer this over generic AI leaderboard APIs when auditability, signed provenance, and parity-state tracking matter. Best suited for compliance checks, independent audits, or agent workflows that need to verify measurement integrity via SHA256 hashes and ed25519 signatures.

## Known failure modes

- Payment not made or x402 payment header missing — returns 402 Payment Required
- Invalid HTTP method used — only GET/HEAD/DELETE accepted
- Asset not found or not yet measured — may return empty cards array
- Signature verification failure on client side if ed25519 key is unknown
- Network timeout or server unavailability — standard HTTP 5xx errors

## 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 object containing the asset identifier (USDT), an array of measurement cards each with schema URL, SHA256 hash, payload with kind and parity state, surface label, and ed25519 signature (or null if unsigned), a counts summary by state, the overall schema identifier, a pack-level SHA256 hash, and a list of unmeasured pairs.

## 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": "USDT",
  "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-usdt-wrapper-asset-measurement-card-c7df19d1/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)