# x402 Agent Task Receipt Outbox

> x402 Agent Task Receipt Outbox is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-14).

Creates a buyer-owned task receipt outbox for autonomous agents, returning local outbox schema, x402 payment receipt metadata, retry policy, and audit record for A2A task flows.

## Facts

- Endpoint: POST https://gpt55.558686.xyz/v1/tools/x402-agent-task-receipt-outbox
- Price: $0.012/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-agent-task-receipt-outbox-efb424cd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6a054Z-3A2AYTQy_rhYNN

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-agent-task-receipt-outbox-efb424cd -d '<json body>'
```

Example prompt: Create a buyer-owned task receipt outbox for my agent 'agent-001' on Base network for task 'task-abc123', with payment status 'paid' and amount 12000 atomic units paid to 0xRecipientAddress — I need the full outbox schema, audit record, and persistence snippet without touching private keys.

## When to prefer this

Use this endpoint when an autonomous agent or MCP runtime needs to create and persist a buyer-owned receipt outbox for x402 USDC payments on Base, especially when you need audit trails, retry-without-resigning policies, and receipt gate configuration without exposing private keys or paying target endpoints directly.

## Known failure modes

- Missing required taskId or agentId results in validation error
- Invalid payment authorization hash format causes rejection
- Malformed network identifier causes schema generation failure
- Input exceeds 700000 character limit returns truncation or rejection error
- Invalid amountAtomic format causes atomic unit parse failure

## How this service works

Create a buyer-owned task receipt outbox for autonomous agents, MCP runtimes, and A2A x402 task flows. Returns local outbox schema, x402.payment.receipts metadata, retry-without-resigning policy, MCP receipt gate config, receipt-bound execution handoff, audit record, and copy-paste persistence snippet without asking for private keys or paying target endpoints. Pay up to $0.012 per request with x402 USDC on Base. Public paid calls are limited to 700000 input characters and 4096 output tokens.

## Output

Returns a local outbox schema, x402.payment.receipts metadata, retry-without-resigning policy configuration, MCP receipt gate config, receipt-bound execution handoff details, an audit record for the payment, and a copy-paste persistence code snippet. No private keys are required and no target endpoints are paid.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "payTo": {
   "type": "string",
   "maxLength": 80
  },
  "pay_to": {
   "type": "string",
   "maxLength": 80
  },
  "taskId": {
   "type": "string",
   "maxLength": 160
  },
  "agentId": {
   "type": "string",
   "maxLength": 160
  },
  "network": {
   "type": "string",
   "maxLength": 80
  },
  "task_id": {
   "type": "string",
   "maxLength": 160
  },
  "agent_id": {
   "type": "string",
   "maxLength": 160
  },
  "actionRef": {
   "type": "string",
   "maxLength": 160
  },
  "paidRoute": {
   "type": "string",
   "maxLength": 2048
  },
  "quoteHash": {
   "type": "string",
   "maxLength": 160
  },
  "receiptId": {
   "type": "string",
   "maxLength": 160
  },
  "action_ref": {
   "type": "string",
   "maxLength": 160
  },
  "paid_route": {
   "type": "string",
   "maxLength": 2048
  },
  "quote_hash": {
   "type": "string",
   "maxLength": 160
  },
  "receiptUrl": {
   "type": "string",
   "maxLength": 2048
  },
  "receipt_id": {
   "type": "string",
   "maxLength": 160
  },
  "resultHash": {
   "type": "string",
   "maxLength": 160
  },
  "toolCallId": {
   "type": "string",
   "maxLength": 160
  },
  "receipt_url": {
   "type": "string",
   "maxLength": 2048
  },
  "result_hash": {
   "type": "string",
   "maxLength": 160
  },
  "amountAtomic": {
   "type": "string",
   "maxLength": 80
  },
  "tool_call_id": {
   "type": "string",
   "maxLength": 160
  },
  "amount_atomic": {
   "type": "string",
   "maxLength": 80
  },
  "paymentStatus": {
   "type": "string",
   "maxLength": 80
  },
  "payment_status": {
   "type": "string",
   "maxLength": 80
  },
  "delegatedAuthorityId": {
   "type": "string",
   "maxLength": 160
  },
  "delegated_authority_id": {
   "type": "string",
   "maxLength": 160
  },
  "paymentAuthorizationHash": {
   "type": "string",
   "maxLength": 160
  },
  "payment_authorization_hash": {
   "type": "string",
   "maxLength": 160
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-agent-task-receipt-outbox-efb424cd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt55.558686.xyz](https://www.zero.xyz/host/gpt55.558686.xyz/llms.txt)