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X402 Refund Amount Check
x402
X402 Refund Amount Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-17).
Validates that a requested refund raw amount does not exceed the original settled raw amount for an x402 transaction, returning an explicit acceptance or rejection with mismatch reasons.
Price / call$0.001
Success—
StatusUnknown
How this service works
X402 Refund Amount Check: X402 Refund Amount Check compares requested refund raw amount with original settled amount from bounded caller-supplied values without an external provider. Call X402 Refund Amount Check before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Refund Amount Check as versioned deter…
Output
Returns an explicit acceptance or rejection status for the refund, along with normalized evidence of the comparison, contract-specific validation checks, and detailed mismatch reasons if the requested refund amount exceeds the settled amount.
Example use cases
Pre-refund validation for agent payment
“I need to validate a refund request before processing it — the original settled raw amount was 2000000 and the customer is requesting a refund of 1800000. Can you check if that refund amount is acceptable?”
Mismatch detection on overfunded refund
“Someone submitted a refund request for 3000000 raw units but the original x402 settlement was only 2500000. Can you verify whether this refund is valid or flag the mismatch?”
Pre-acceptance check for x402 agent delivery
“Before I accept this x402 agent delivery result, can you verify that the requested refund raw amount of 500000 doesn't exceed the originally settled raw amount of 500000?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/x402-refund-amount-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to validate x402 refund requests before processing or accepting them, specifically to ensure a requested refund does not exceed the original settled amount. Prefer this over manual comparisons when working within x402 or agent delivery workflows where auditability and explicit rejection reasons are required.
Side effects
- Missing or malformed settled_raw or requested_raw inputs returns an error
- Non-numeric string values in either field may cause computation failure
- Values exceeding maxLength of 8192 characters are rejected
- Ambiguous or empty strings may produce indeterminate validation results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| settled_raw | string | Settled Raw supplied to X402 Refund Amount Check; used only for this bounded calculation and processed in memory without retention. |
| requested_raw | string | Requested Raw supplied to X402 Refund Amount Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"drift_raw": "0",
"actual_raw": "1000",
"expected_raw": "1000",
"within_tolerance": true
},
"schema": "delx/util-x402-refund-amount-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "8f2b3a0b094ceb2d8c75d4ce4b7f179347769e2b9645666d7c973aae510291f0",
"external_calls": 0
},
"operation": "delivery_contract:x402_refund_amount_check"
}
}Tags
x402
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