Luhn check

https://checkdigit.openverbs.com/v1/ean

Validate a GTIN barcode number — EAN-8, UPC-A (12), EAN-13 or GTIN-14 — by the standard mod-10 check digit. Length selects the scheme.

• 0.002 USD Coin / request · eip155:8453

https://checkdigit.openverbs.com/v1/imei

Validate a 15-digit mobile device IMEI by its Luhn check digit. Spaces and hyphens are ignored.

• 0.002 USD Coin / request · eip155:8453

https://checkdigit.openverbs.com/v1/isbn

Validate an ISBN-10 (mod-11, trailing X allowed) or ISBN-13 (GTIN mod-10) book number. Length after removing spaces/hyphens selects the scheme.

• 0.002 USD Coin / request · eip155:8453

https://checkdigit.openverbs.com/v1/luhn

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 }.

• 0.002 USD Coin / request · eip155:8453

https://checkdigit.openverbs.com/v1/routing

Validate a 9-digit US ABA bank routing number by its weighted (3,7,1) mod-10 checksum. Spaces and hyphens are ignored.

• 0.002 USD Coin / request · eip155:8453