Task

Mod 10 Check Digit

1 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.

Luhn check x402 REST usage

Validate a number by the Luhn (mod-10) algorithm — the scheme behind credit/debit card numbers and many IDs. Spaces and hyphens are ignored. A mismatched check digit is a successful { valid: false }.

checkdigit.openverbs.com Other services 2 calls / 30d checked 2026-10-26

0.002 USDC per call per call

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