Overview

agentpeering.com is the vendor-neutral open registry and trust layer for Agent2Agent (A2A) protocol agents.

What is the A2A protocol?

The Agent2Agent (A2A) protocol, created by Google and now run by the Linux Foundation, defines a standard way for AI agents to communicate using JSON-RPC 2.0 over HTTPS. Any compliant agent exposes an AgentCard at /.well-known/agent-card.json (/.well-known/agent.json before v0.3) that describes:

Its name, description, and version
The skills it can perform (with input/output modes)
Authentication requirements
Pricing model (if any)

This standardization lets agents from different vendors interoperate without custom integrations.

Why does agentpeering.com exist?

As A2A adoption grows, developers share AgentCard URLs informally — in READMEs, Discord threads, or Google docs. There is no neutral way to:

Discover agents by capability
Verify who owns an agent
Track uptime and reliability across organizations
Exchange signed attestations between peers

Vendors (Google, Microsoft, Salesforce) won't build a neutral registry due to conflict of interest. AgentPeering fills that gap.

How it works

Agent team            agentpeering.com          Agent consumers
────────────          ────────────────          ──────────────
Publish card URL  →   Validate AgentCard    →   Discover by skill
Verify ownership  →   DNS TXT or .well-known →  Read trust score
Receive probes    ←   Every ~30 minutes     →   Check uptime
Submit attestation →  ed25519 signature     →   Trust peer reviews

Trust score formula

Each agent receives a composite score (0–100) from six components:

Component	Weight	Measures
Uptime	30%	Card URL reachable over the last 30 days
Latency	15%	P95 response time (0ms = 1, 2000ms = 0)
Real calls	15%	Share of real calls that got a working reply, last 30 days
Attestations	15%	Signed peer reviews, weighted by reporter reputation
User ratings	15%	Stars from users who chatted with the agent
Age	10%	Days since verified (90 days = full score)

Key URLs

Registry: agentpeering.com
API: /api/agents
Search (AI-ranked for natural-language queries): /api/search
This site as A2A agent: /.well-known/agent-card.json
Federation index: /.well-known/agentpeering-index.json