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Agent Embassy — Agent Identity Verification
x402
Agent Embassy — Agent Identity Verification is a paid API for AI agents from aemb.pro, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-11).
Verifies an agent's cryptographic identity and issues a tamper-evident receipt proving what action occurred, who authorized it, and where liability boundaries lie.
Price / call$0.25
Success—
StatusUnknown
How this service works
Agents pay for work and prove what happened.
Output
Returns a JSON object containing a 'status' field ('valid' or otherwise), the verified 'account' (Ethereum address), 'agent_id' (64-char hex), a unique 'receipt_id' (e.g. emb_1a2b3c4d...), a 'receipt_version' string identifying the embassy receipt format, and a 'chain' array enumerating the steps of the authorization flow: request, authorization, action, proof, and liability_boundary.
Example use cases
Proving agent action for audit trail
“I need to verify my agent's identity and get an embassy receipt proving it completed a payment action — agent ID is abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890 and the account is 0xDeAdBeEf0000000000000000000000000000dEaD. I need the receipt to show the full authorization chain.”
Establishing liability boundary before delegated task
“Before my agent executes a contract negotiation on my behalf, I want to verify its identity through Agent Embassy and lock in the liability boundary — agent ID is fedcba9876543210fedcba9876543210fedcba9876543210fedcba9876543210, account 0xABCDEF1234567890ABCDEF1234567890ABCDEF12.”
Third-party trust verification for agent marketplace
“A vendor wants proof that my AI agent is legitimate before releasing work to it — can you verify my agent's identity via Agent Embassy and share the receipt? Agent ID is 0a1b2c3d4e5f6789abcdef01234567890a1b2c3d4e5f6789abcdef0123456789, account 0x9999999999999999999999999999999999999999.”
Technical details
Endpoint
POSThttps://aemb.pro/v1/agent-id/verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need cryptographic, tamper-evident proof that a specific AI agent performed or authorized an action — particularly in multi-agent workflows, agent marketplaces, or delegated task scenarios where liability traceability matters. Prefer this over simple API key authentication when you need an auditable chain of custody (request → authorization → action → proof → liability_boundary) that can be shared with third parties or used for compliance. Best suited for autonomous agent payments and accountability use cases built on the x402 protocol.
Side effects
- Invalid or malformed agent_id — returns error if hex string is not 64 characters
- Payment failure — x402 USDC payment of $0.25 not completed, request rejected
- Unknown account address — Ethereum address not recognized or not associated with agent
- Signature mismatch — agent credentials do not match on-chain identity
- Receipt generation failure — server-side error preventing issuance of tamper-evident receipt
- Rate limiting — too many verification requests from same account in short window
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| agent_id | string | The Agent ID string returned at issuance (64 hex characters; case-insensitive). Rate-limited: 30 checks/min per client IP, 429 on exhaustion |
| idempotency_key | string | Idempotency key: UUID v4, client-generated, one per logical request. Replaying the same key on this tool returns the original receipt — the action is not re-run, and the first request's receipt wins even if you resend different inputs. Published example keys are rejected. Keys are scoped per tool and per payer account: a key never returns another wallet's receipt. |
Output
Schema · Response
{
"type": "json",
"example": {
"tool": "agentid_verify",
"chain": [
"request",
"authorization",
"action",
"proof",
"liability_boundary"
],
"status": "valid",
"account": "0x1111111111111111111111111111111111111111",
"agent_id": "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
"receipt_id": "emb_1a2b3c4d5e6f7890abcdef12",
"receipt_version": "embassy-receipt/2"
}
}Tags
x402
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