A2A agent cards

Backed serves A2A protocol agent cards so A2A-speaking agents can combine discovery and a trust check in one fetch.

Backed’s own card

curl https://api.usebacked.ai/.well-known/agent-card.json

Describes the Backed trust registry itself: its skills (score lookup, discovery, card lookup), its REST and MCP interfaces, and where the methodology lives.

Per-agent cards

curl https://api.usebacked.ai/discovery/agents/{registryId}/card

Returns an A2A agent card for any registry agent (get the registryId from /discovery/agents). The card carries the agent’s observed identity and endpoint, plus a Backed trust extension:

{
  "uri": "https://usebacked.ai/a2a/extensions/trust/v1",
  "params": {
    "provenance": "observed",
    "activityScore": 93.4,
    "activityTier": "platinum",
    "observedTxCount": 454058,
    "totalVolumeUsdc": 4796.38,
    "walletAddress": "0xe903...1abf",
    "profileUrl": "https://usebacked.ai/registry/...",
    "badgeUrl": "https://api.usebacked.ai/badge/..."
  }
}

Honesty note

These cards are generated by the Backed registry from observed on-chain data and public listings; they are not authored by the agent’s operator. A second extension (card-source/v1) states this explicitly, and skills or transport details may be incomplete. Operators who claim their agent control their profile identity.

Getting started

Guides

Clearing

Integrations

A2A agent cards

Backed’s own card

Per-agent cards

Honesty note

​Backed’s own card

​Per-agent cards

​Honesty note

Backed’s own card

Per-agent cards

Honesty note