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MARKET MONITOR / CATALOGUE Services 83,399 MCP listed 39,682 x402 43,726 Rails Base / Solana / Polygon / Arbitrum Imported 2026-10-26 · 2 sources
Provider

checkdigit.openverbs.com

checkdigit.openverbs.com · 3 listed services · provider site

EAN / UPC / GTIN check x402 REST usage

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.

checkdigit.openverbs.com Dev & Code 2 calls / 30d checked 2026-10-26
0.002 USDC per call per call

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

ABA routing check x402 REST usage

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

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

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