# Council of AI — x402-Bazaar Population Slice

> Council of AI — x402-Bazaar Population Slice 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).

Fetches a signed, verifiable snapshot of x402 API marketplace listings indexed by Council of AI's independent measurement system

## Facts

- Endpoint: GET https://councilof.ai/api/pop/x402-bazaar?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-x402-bazaar-population-slice-19a28457
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_K8KkHcKo9yJDubVhBLMEQ

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-x402-bazaar-population-slice-19a28457
```

Example prompt: Can you pull the latest signed population slice from the Council of AI x402-bazaar index so I can see what API listings are currently indexed and check the attestation signature?

## When to prefer this

Use this endpoint when you need a cryptographically attested, independently verifiable snapshot of x402 marketplace API listings — particularly when auditability, tamper-evidence, or signed provenance of directory data matters. Prefer this over generic API directories when you need the ed25519 signature and SHA-256 hash for downstream verification, or when you specifically need the Council of AI's independent measurement provenance rather than a self-reported listing.

## Known failure modes

- Payment not received or insufficient — returns 402 with payment requirements
- Invalid HTTP method (e.g. POST) — only GET, HEAD, DELETE accepted
- Attestation signature is null if signing has not yet occurred for that slice
- Source artifacts temporarily unavailable — stale or missing rows data
- Network or CAIP-2 chain unavailable — settle fields return null

## 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: a slice ID ('x402-bazaar'), kind ('slice'), verbatim population rows of x402 marketplace listings, an as_of timestamp, an INDEXED state flag, source artifact file references, settlement info (payer address, network, transaction hash), and a signed attestation card with SHA-256 hash, ed25519 signature, and schema reference. The 'n' field is null (not zero) because the artifact refuses a total count across overlapping index frames.

## 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": {
  "n": null,
  "id": "x402-bazaar",
  "kind": "slice",
  "rows": "<the population rows / artifact bytes, verbatim>",
  "as_of": "2026-09-17T05:48:05Z",
  "state": "INDEXED",
  "n_unit": "listings per index frame (frames overlap; the artifact refuses a total, so n is null — not 0)",
  "schema": "csoai.population-door/0.1",
  "settle": {
   "payer": "<0x… or null>",
   "network": "<caip2 or null>",
   "transaction": "<0x… or null>"
  },
  "source": [
   "/interop/agent-population-2026-09-17.json",
   "/interop/x402-door-census-2026-09-16.json"
  ],
  "attestation": {
   "schema": "https://councilof.ai/schema/card-v0.json",
   "sha256": "<hex>",
   "payload": {
    "kind": "csoai.population.slice/0.1",
    "rows_sha256": "<hex>"
   },
   "surface": "population.slice",
   "sig_ed25519": "<hex or null>"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/council-of-ai-x402-bazaar-population-slice-19a28457/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)