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Second Eyes Payment Confirmation Check
x402
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.
Price / call$0.01
Success—
StatusUnknown
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.
Example use cases
Agent retry loop payment deduplication
“My agent is stuck retrying a payment and I'm worried it already succeeded — check whether the original transaction was already fulfilled so we can stop the loop without double-paying.”
Recovering lost payment receipt
“I sent a USDC payment but crashed before getting the confirmation — can you verify if that payment settled and recover the grant ID and receipt I need to continue?”
Uncertain auth after network timeout
“My agent got a network timeout right after submitting a payment and I don't know if it landed — tell me if the transaction is already confirmed so I know whether to retry or move forward.”
Technical details
Endpoint
POSThttps://secondeyesai.com/api/bar/x402/payment-confirmation-checkWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"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"
}
}Tags
x402
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