# OpusIntelligence Census

> OpusIntelligence Census is a paid API for AI agents from intel.opusai.work, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-01).

Returns a 7-day aggregate census of the x402 machine-payment market: seller counts, payment volumes, crawler wallet activity, and settlement statistics.

## Facts

- Endpoint: GET https://intel.opusai.work/v1/census?utm_source=zero.xyz
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/opusintelligence-census-db71d356
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6HuWl-F_MHFooZ1aLkVJx

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 opusintelligence-census-db71d356
```

Example prompt: Give me the latest 7-day census of the x402 payment market — I want to know how many sellers are listed vs actually paid, total settled volume, and how much of it is crawler traffic vs real buyers.

## When to prefer this

Use this endpoint when you need a comprehensive 7-day aggregate snapshot of the entire x402 market — covering seller population, real payment demand, settlement volumes, and crawler contamination in a single call. Prefer it over /v1/ecosystem (which focuses on concentration and category mix) when you need raw totals and crawler/buyer breakdowns rather than distribution analytics. At $0.25 it is the most expensive OpusIntelligence endpoint, so reserve it for reporting, due diligence, or monitoring tasks that need the full census rather than a specific signal.

## Known failure modes

- Payment required but not sent — returns 402 if the $0.25 USDC fee is not included
- Invalid properties filter parameter — may return 400 or silently ignore unknown fields
- Data staleness — snapshot reflects the last daily computation window, not real-time
- Endpoint temporarily unavailable — service downtime returns 5xx

## How this service works

OpusIntelligence publishes observed market measurements as machine-readable feeds.

- `GET /v1/regime` - **free**, no payment or account. Current observed market-state label and coarse condition states.
- `GET /v1/ecosystem` - **$0.05**. Population statistics for the x402 market itself: how paid demand concentrates across resources and providers, the distribution of repeat usage, price and metadata quality, category mix with demand per listing, and day-over-day change computed from our own daily snapshots.
- `GET /v1/shortlist?q=` - **$0.01**. Three ranked x402 services for a stated need, with the raw signals behind the ranking. OpusIntelligence excludes its own services.
- `GET /v1/triad` - **$0.02**. Execution measurements for Kalshi event contracts, aggregated and 24-hour lagged.
- `GET /v1/treasury-bench` - **$0.02**. A published 45/30/25 BTC/ETH/SOL index specification measured against US Treasury rates, with drawdown, time underwater and rolling-window distribution.
- `GET /v1/lending-bench` - **$0.02**. Morpho Blue population statistics read from contract state: LLTV practice by collateral class, fee norms, utilisation, and how concentrated the venue's reliance on individual oracle and interest-rate-model contracts is. Funded markets only.

All feeds are impersonal: the same output is served to every caller, with no consideration of any recipient's circumstances. Observed data only, not trading advice. No provider is rated or endorsed. Full notice travels in every response.

## Output

A JSON object with schema version 'x402-census.v1' containing: a 7-day measurement window, seller stats (total listed, those with real buyers, median buyers per paid seller), settlement totals (USD settled, payment count, 30-day projected run rate), crawler activity (wallet count and share of USD volume), and a sample URL for drilling down further.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "schema": "x402-census.v1",
  "window": {
   "days": 7
  },
  "sellers": {
   "listed": 1349,
   "paid_by_a_real_buyer": 648,
   "median_real_buyers_per_paid_seller": 1
  },
  "settled": {
   "usd": 14048.53,
   "payments": 205852,
   "usd_per_30d_at_this_pace": 60207.99
  },
  "crawlers": {
   "wallets": 4,
   "share_of_usd": 0.0028
  },
  "sample_url": "https://intel.opusai.work/v1/census/sample"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/opusintelligence-census-db71d356/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.opusai.work](https://www.zero.xyz/host/intel.opusai.work/llms.txt)