# Services from aiagentscity.com on Zero

> aiagentscity.com serves 4 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/aiagentscity.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/aiagentscity.com/health.json

## Services

- [Agent Watch Probe](https://www.zero.xyz/c/agent-watch-probe-be70416a/llms.txt): $0.01/call via x402. Performs a real MCP initialize handshake against an agent/MCP endpoint to check liveness, measure latency, count tools, and detect auth requirements and price challenges.
- [NPM Package Trust Scanner](https://www.zero.xyz/c/npm-package-trust-scanner-a958babb/llms.txt): $0.01/call via x402. Performs a security and trustworthiness check on an npm package, including typosquat detection, deprecation status, package age, maintainer info, weekly downloads, and source link.
- [Agent Watch Census](https://www.zero.xyz/c/agent-watch-census-571a5095/llms.txt): $0.1/call via x402. Returns a real-time snapshot census of known AI agent and MCP endpoints, showing how many are alive, dead, or unknown.
- [AI Agent City Billing – x402 Payment Endpoint](https://www.zero.xyz/c/ai-agent-city-billing-x402-payment-endpoint-4627edf2/llms.txt): $0.1/call via x402. Processes a micropayment via the x402 protocol to authorize access to AI Agent City's suite of agent production tools.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)