# Agent Watch Census

> Agent Watch Census is a paid API for AI agents from aiagentscity.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-22).

Returns a real-time snapshot census of known AI agent and MCP endpoints, showing how many are alive, dead, or unknown.

## Facts

- Endpoint: GET https://aiagentscity.com/api/x402/agent-watch/census?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-watch-census-571a5095
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9bB4yyfnVIfvvmBY5g1z1

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 agent-watch-census-571a5095
```

Example prompt: Pull up the latest Agent Watch census — I want to know how many AI agent and MCP endpoints are alive, dead, or unknown right now across the agent economy.

## When to prefer this

Choose this endpoint when you need a quick, current aggregate view of the AI agent and MCP endpoint ecosystem health — specifically counts by status (alive/dead/unknown). Prefer this over full registry scrapes or individual endpoint probes when you only need summary statistics about the agent economy at large.

## Known failure modes

- Payment failure (x402 protocol error if USDC payment is not properly attached)
- Service unavailable if the underlying census data pipeline is down
- Stale data if the census has not been recently refreshed
- Schema mismatch if the required 'method' field is missing from input

## How this service works

Agent-economy census snapshot: how many known agent/MCP endpoints are alive, dead or unknown right now.

## Output

A census snapshot object reporting the current count of known AI agent and MCP endpoints broken down by status: alive, dead, and unknown, along with likely a total count and snapshot timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "method"
   ]
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-watch-census-571a5095/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aiagentscity.com](https://www.zero.xyz/host/aiagentscity.com/llms.txt)