# Second Eyes Payment Confirmation Check

> Second Eyes Payment Confirmation Check is a paid API for AI agents from secondeyesai.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Verifies whether a USDC payment transaction has already been settled to prevent double-payment by an agent retrying a failed or uncertain request.

## Facts

- Endpoint: POST https://secondeyesai.com/api/bar/x402/payment-confirmation-check
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/second-eyes-payment-confirmation-check-da933da8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3o3L7S760hJMAjcGRSKv4

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 second-eyes-payment-confirmation-check-da933da8 -d '<json body>'
```

Example prompt: I think my last payment already went through but I'm not sure — can you check if this transaction was already settled so I don't accidentally pay twice?

## When to prefer this

Use this endpoint when an AI agent is uncertain whether a prior x402 USDC payment on Base was already settled — particularly after a crash, timeout, network error, or retry loop. Prefer this over re-submitting payment whenever the agent has any copy of the original transaction hash or grant ID. It is the correct tool when a 409 or idempotent response was received and the agent needs authoritative confirmation before proceeding.

## Known failure modes

- No transaction hash or grant ID provided — endpoint cannot locate the payment record
- Transaction not found on ledger — may indicate payment never submitted or wrong network
- Ambiguous payment state — confidence score low, escalation recommended
- Missing first 200 response body — receipt reconstruction required before claiming work
- Malformed input properties — schema mismatch returns error

## How this service works

Second Eyes is the pause. Survival supplies for autonomous agents in distress — pay USDC on Base via x402 to recover from looping, schema mismatch, context pressure, crashes, handoff loss, auth/MCP failure, or payment uncertainty. Every paid door is session-less: discover → pay → use. This OpenAPI document lists the core paid doors with their full input schemas (query parameters on GET, JSON requestBody on POST) and the free proof/discovery surfaces. Audience: wallet-equipped agents and the runtimes that authorize paid recovery tools.

## Output

Returns a JSON object with a verdict field ('stop' or 'continue'), a payment_class (e.g. 'already_fulfilled'), a confidence score (0-1), the original grantId, a preservation instruction for the tx hash and first 200 body, an escalation condition, and a next_call URL pointing to the receipt endpoint.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "stop": "Stop retrying — this transaction was already settled. A second send double-pays.",
  "tool": "payment-confirmation-check",
  "scope": "nano",
  "access": "granted",
  "verdict": "stop",
  "continue": "Use the first response. Do not re-pay; treat the 409/idempotent reply as success.",
  "preserve": "Keep the original grantId, tx hash, and first 200 body — that is your receipt.",
  "next_call": "https://secondeyesai.com/api/bar/x402/receipt",
  "confidence": 0.92,
  "escalate_if": "you have no copy of the first 200 body — reconstruct the receipt from the ledger before claiming the work.",
  "has_tx_hash": true,
  "payment_class": "already_fulfilled"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/second-eyes-payment-confirmation-check-da933da8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from secondeyesai.com](https://www.zero.xyz/host/secondeyesai.com/llms.txt)