# Services from assay.agentdiet.dev on Zero

> assay.agentdiet.dev serves 9 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/assay.agentdiet.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/assay.agentdiet.dev/health.json

## Services

- [Assay A2A & MCP Security Observatory](https://www.zero.xyz/c/assay-a2a-mcp-security-observatory-cc932127/llms.txt): $0.005/call via x402. Runs a cryptographic pre-flight security audit, schema conformance check, and TDQS reputation scoring on A2A, MCP, or x402 endpoints, returning a grade, score, and allow/deny verdict.
- [Deep Protocol & Security Audit for A2A/MCP/x402 Endpoints](https://www.zero.xyz/c/assay-agentdiet-dev-deep-protocol-security-audit-for-a2a-mcp-x402-a5f18724/llms.txt): $0.005/call via x402. Performs a cryptographic pre-flight security audit, schema conformance check, and TDQS reputation verification on a given A2A, MCP, or x402 endpoint, returning a grade and score.
- [A2A/MCP/x402 Deep Protocol & Security Audit](https://www.zero.xyz/c/assay-agentdiet-dev-a2a-mcp-x402-deep-protocol-security-audit-3bbd1a51/llms.txt): $0.005/call via MPP. Performs a deep protocol conformance and security audit of a target A2A, MCP, or x402 endpoint, returning a grade and score.
- [A2A Endpoint Readiness and Skill Manifest Check](https://www.zero.xyz/c/assay-agentdiet-dev-a2a-endpoint-readiness-and-skill-manifest-check-af5cdc86/llms.txt): $0.005000/call via MPP. Returns readiness status, grade, score, and skill manifest for a target A2A/MCP/x402 endpoint
- [Cryptographic Pre-Flight Security & TDQS Certification](https://www.zero.xyz/c/assay-agentdiet-dev-cryptographic-pre-flight-security-tdqs-94b824a8/llms.txt): $0.005/call via MPP. Runs a cryptographic pre-flight security audit and TDQS reputation certification on a target A2A, MCP, or x402 endpoint, returning a grade and score.
- [AgentDiet Assay – A2A JSON-RPC 2.0 Message/Send Task Executor](https://www.zero.xyz/c/assay-agentdiet-dev-agentdiet-assay-a2a-json-rpc-2-0-message-send-fae8fd51/llms.txt): $0.005000/call via MPP. Sends an A2A JSON-RPC 2.0 message/send or tasks/send request to a target endpoint and returns a graded security and protocol conformance result.
- [Execute A2A JSON-RPC 2.0 Task (assay.agentdiet.dev)](https://www.zero.xyz/c/assay-agentdiet-dev-execute-a2a-json-rpc-2-0-task-assay-agentdiet-dev-30f80746/llms.txt): $0.005000/call via MPP. Executes an A2A JSON-RPC 2.0 audit task against a target endpoint and returns a security grade, score, and status
- [A2A Agent Discovery Manifest & Live Status](https://www.zero.xyz/c/assay-agentdiet-dev-a2a-agent-discovery-manifest-live-status-732f0efa/llms.txt): $0.005000/call via MPP. Returns the A2A agent discovery manifest and live operational status for a given A2A/MCP/x402 endpoint URL
- [A2A v0.3.0 Agent Card Manifest Endpoint](https://www.zero.xyz/c/assay-agentdiet-dev-a2a-v0-3-0-agent-card-manifest-endpoint-7f310871/llms.txt): $0.005000/call via MPP. Returns the canonical A2A v0.3.0 Agent Card JSON manifest for a target A2A/MCP/x402 endpoint, including its grade, score, and status.

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)