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

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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.

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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/..."
  }
}

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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.