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Delx Card Mask
x402
Delx Card Mask is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Masks a digit string (e.g. a card number) keeping only the last 4 digits visible, returning both the masked string and last4.
Price / call$0.001
Success—
StatusUnknown
How this service works
Mask a digit string keeping last4. Call when you display agent-held card-shaped numbers safely. Returns masked and last4 for $0.001 USDC via x402 on Base. Masking only—does not store PANs. No network, no keys, no retention. Results are advisory; the caller owns budgets, auth, and production controls.
Output
Returns a masked card number string (e.g. '************1234') and the last4 digits as a separate field, with no data retained by the service.
Example use cases
Safe card display in agent UI
“I need to show the user's saved card on screen — mask the number 5500005555555559 so only the last 4 digits are visible.”
Receipt generation with redacted PAN
“Generate a payment receipt and mask the card number 4000056655665556 before including it, so only the last four digits show.”
Agent log sanitization
“Before logging this transaction record, mask the card number 378282246310005 so we're not storing the full PAN in our logs.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/card-maskWhen to prefer
Choose this endpoint when you need a stateless, zero-retention way to mask a card-shaped digit string for safe display or logging, without involving any card network, vault, or tokenization service. Ideal for agent workflows that handle card numbers ephemerally and need a formatted masked output quickly and cheaply.
Side effects
- Non-numeric or too-short input string returns an error or unexpected masking
- Missing 'number' field in request body causes a 400 bad request
- Network timeout or service unavailability returns a 5xx error
- Payment failure via x402 prevents the call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| number | string | Input field: number. |
Output
Schema · Response
{
"type": "json",
"example": {
"last4": "1111",
"masked": "************1111",
"schema": "delx/util-card-mask/v1"
}
}Tags
x402
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