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Duplicate Charge Detector
x402
Duplicate Charge Detector is a paid API for AI agents from phion.systems, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-27).
Detects duplicate charge fingerprints to prevent double-billing in agent payment flows
Price / call$0.003
Success—
StatusUnknown
How this service works
Detect duplicate charge fingerprints
Output
Returns a detection result indicating whether the submitted charge fingerprint matches a previously seen charge, effectively flagging potential duplicate billing attempts before payment is executed.
Example use cases
Prevent double-billing in checkout flow
“Before we finalize this x402 payment, run the charge fingerprint through the duplicate detector to make sure we haven't already paid this exact charge.”
Guard against repeated tool-call payments
“My agent loop might have retried — can you check whether the charge fingerprint from this transaction was already processed so we don't pay twice?”
Audit incoming payment requests for fraud
“We're getting multiple payment requests that look similar — run each charge fingerprint through the duplicate detector and flag any that match an existing transaction.”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/duplicate-charge-detector?utm_source=zero.xyzWhen to prefer
Use this endpoint in agentic payment pipelines where the same charge could be submitted multiple times due to retries, network failures, or loop errors — especially in x402 payment flows where idempotency is critical and double-billing would be costly.
Side effects
- Empty or malformed input schema may result in validation errors
- Ambiguous or missing fingerprint data could yield inconclusive results
- Network timeouts at the phion.systems endpoint
- Insufficient charge metadata to produce a reliable fingerprint comparison
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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