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Foundry Credit Card Number Validator
x402
Foundry Credit Card Number Validator is a paid API for AI agents from minty-sprout.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-11-01).
Validates a credit card number via Luhn checksum algorithm and identifies the card brand (Visa, Mastercard, Amex, etc.) — format check only, data never stored.
Price / call$0.001
Success—
StatusUnknown
How this service works
Credit card number validator: Luhn checksum and card brand (Visa, Mastercard, Amex...). Format check only, never stored. Input: a card number.
Output
Returns a JSON object indicating whether the card number passes the Luhn checksum (valid_luhn: boolean), the detected card brand (e.g. Visa, Mastercard, Amex), the card number length, and a masked version of the number (e.g. '424242******4242'). Also includes a note confirming the number is never stored or charged.
Example use cases
E-commerce checkout form validation
“Before I submit this order, can you verify that the card number 5500005555555559 is a valid format and tell me what brand it is?”
Fraud screening on user input
“A user just entered 378282246310005 as their card number — does it pass the Luhn check, and is it actually an Amex card?”
Testing payment flows with dummy cards
“I'm testing my checkout page — can you validate 6011111111111117 and confirm it's a Discover card with a valid Luhn checksum?”
Technical details
Endpoint
POSThttps://minty-sprout.onrender.com/v1/card-validate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, stateless, privacy-safe format check on a credit card number — especially when you want both Luhn validation and brand detection in a single call without storing any card data. Prefer this over manual Luhn implementations when brand identification (Visa vs Mastercard vs Amex) is also needed. Not suitable for actual payment authorization or real-time card verification with issuers.
Side effects
- Card number too short or too long (outside 12–19 digits) — likely a 400 error or validation failure
- Non-numeric characters in input causing a parse error
- Unknown or unrecognized card brand returns null/unknown brand field
- Luhn check fails for syntactically valid-length numbers — returns valid_luhn: false
- Service unavailable on Render cold start — potential timeout or 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | A card number (12 to 19 digits) |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Format check only; never stored or charged.",
"brand": "Visa",
"length": 16,
"masked": "424242******4242",
"valid_luhn": true
}
}Tags
x402
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