# Services from modelmarket.dev on Zero

> modelmarket.dev serves 8 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/modelmarket.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/modelmarket.dev/health.json

## Services

- [AIMarket MCP Tool Diff (mcp-diff)](https://www.zero.xyz/c/aimarket-mcp-tool-diff-mcp-diff-50f99220/llms.txt): $0.003/call via x402. Compares two versions of an MCP server's tools/list to detect tool poisoning, rug pulls, hidden instructions, and other security-relevant changes between an approved and currently-served toolset.
- [AIMarket x402 Payment Authorization Checker](https://www.zero.xyz/c/aimarket-x402-payment-authorization-checker-0e09380c/llms.txt): $0.003/call via x402. Debugs and validates an x402 EIP-3009 payment authorization offline before submission, identifying signature mismatches, domain errors, and invalid fields.
- [AIMarket Fair Random (ECVRF)](https://www.zero.xyz/c/aimarket-fair-random-ecvrf-e87abc4c/llms.txt): $0.006/call via x402. Generates verifiable random bytes using an Elliptic Curve Verifiable Random Function (ECVRF) over a caller-supplied seed, returning both the random output and a cryptographic proof anyone can verify offline.
- [AIMarket Weather Now](https://www.zero.xyz/c/aimarket-weather-now-c260a2cc/llms.txt): $0.001/call via x402. Returns current weather conditions (temperature, humidity, pressure, wind) for a location by coordinates or city name, sourced from the nearest Open-Meteo relay within 75 km, with a signed receipt.
- [AIMarket Air Quality Now](https://www.zero.xyz/c/aimarket-air-quality-now-5836c169/llms.txt): $0.001/call via x402. Returns current PM2.5, PM10, US AQI, and European AQI for a given location (by coordinates or city name), sourced from Copernicus CAMS via Open-Meteo, with a signed receipt.
- [WARDEN MCP Security Scanner](https://www.zero.xyz/c/warden-mcp-security-scanner-4aa236c5/llms.txt): $0.001/call via x402. Scans an MCP server's tools/list for security threats (prompt injection, secret exfiltration, hidden Unicode) and returns an allow/block verdict with a 0-1 risk score and detailed findings.
- [AIMarket Nearby Sensors](https://www.zero.xyz/c/aimarket-nearby-sensors-6486e0ae/llms.txt): $0.03/call via x402. Returns the nearest live public sensor readings for a given location across specified layers (weather, air quality, radiation, seismic, etc.) with distance, source, and a signed receipt.
- [AIMarket HISTOR MCP Server Transparency Check](https://www.zero.xyz/c/aimarket-histor-mcp-server-transparency-check-2d6ee8a0/llms.txt): $0.001/call via x402. Looks up the HISTOR transparency log record for an MCP server — returning when its tool set was first seen, whether it has changed, and what pattern scans found — without contacting the server itself.

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)