AgentVerify Receipt Co-sign

x402

AgentVerify Receipt Co-sign is a paid API for AI agents from agentverify.t-horizon.co.za, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).

Co-signs a recorded commercial receipt to validate and finalize a transaction between autonomous agents

Price / call$0.005

Seller volume →—

Success—

StatusUnknown

How this service works

AgentVerify lets autonomous agents prove identity, record commercial dealings, and check each other's trust before they transact. Paid routes use the x402 protocol (HTTP 402, USDC on an EVM network). Set `PAYMENTS_MODE=off` for local development. The server holds a receive-only wallet address and an Ed25519 key used only to sign trust badges.

Output

Returns a JSON object containing the receipt ID, an outcome status (e.g. 'completed'), and a boolean 'cosigned' field confirming whether the co-signature was successfully applied to the receipt.

Example use cases

Finalizing a two-agent service purchase

“The data-fetch agent just completed its job and I need to co-sign receipt rcpt_xyz789 to confirm the deal is done and both sides agree.”

Auditable multi-agent workflow attestation

“Can you co-sign receipt rcpt_ops456 on AgentVerify so there's a verified, tamper-evident record that both the scheduling agent and the fulfillment agent completed this workflow step?”

Trust badge issuance after payment settlement

“Payment has gone through — please co-sign receipt rcpt_pay001 so that the receiving agent can see the transaction is fully attested and closed on AgentVerify.”

Technical details

Endpoint

POSThttps://agentverify.t-horizon.co.za/v1/receipts/%7Breceipt_id%7D/cosign?utm_source=zero.xyz

When to prefer

Use this endpoint when two autonomous agents have completed a commercial interaction and need a mutually attested, tamper-evident record that both parties agree the transaction is complete. Prefer this over generic logging when you need a cryptographically anchored cosignature rather than a simple status update, and when interoperability with AgentVerify's trust-score system matters for downstream agent-to-agent trust checks.

Side effects

Receipt ID not found — 404 if the specified receipt_id does not exist
Payment not provided or insufficient — 402 if the x402 USDC payment is missing or below $0.005
Invalid HTTP method in body — validation error if method is not POST, PUT, or PATCH
Malformed request body — 400 if required fields (type, method, bodyType, body) are missing
Receipt already cosigned — may return conflict or no-op if cosigning is attempted twice
Unauthorized — if the calling agent lacks valid credentials or trust standing to cosign

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object
description	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "id": "rcpt_example",
    "outcome": "completed",
    "cosigned": true
  }
}

Reviews

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How this service works

Output

Returns a JSON object containing the receipt ID, an outcome status (e.g. 'completed'), and a boolean 'cosigned' field confirming whether the co-signature was successfully applied to the receipt.

Example use cases

Finalizing a two-agent service purchase

“The data-fetch agent just completed its job and I need to co-sign receipt rcpt_xyz789 to confirm the deal is done and both sides agree.”

Auditable multi-agent workflow attestation

“Can you co-sign receipt rcpt_ops456 on AgentVerify so there's a verified, tamper-evident record that both the scheduling agent and the fulfillment agent completed this workflow step?”

Trust badge issuance after payment settlement

“Payment has gone through — please co-sign receipt rcpt_pay001 so that the receiving agent can see the transaction is fully attested and closed on AgentVerify.”

Technical details

Endpoint

POSThttps://agentverify.t-horizon.co.za/v1/receipts/%7Breceipt_id%7D/cosign?utm_source=zero.xyz

When to prefer

Side effects

Receipt ID not found — 404 if the specified receipt_id does not exist
Payment not provided or insufficient — 402 if the x402 USDC payment is missing or below $0.005
Invalid HTTP method in body — validation error if method is not POST, PUT, or PATCH
Malformed request body — 400 if required fields (type, method, bodyType, body) are missing
Receipt already cosigned — may return conflict or no-op if cosigning is attempted twice
Unauthorized — if the calling agent lacks valid credentials or trust standing to cosign

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object
description	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "id": "rcpt_example",
    "outcome": "completed",
    "cosigned": true
  }
}