Luhn check
checkdigit.openverbs.com · 5 paid endpoints · listed 2026-10-27
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.
Paid endpoints
| Method | Endpoint | Price | Networks |
|---|---|---|---|
| POST | 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 | Base |
| POST | checkdigit.openverbs.com/v1/imei Validate a 15-digit mobile device IMEI by its Luhn check digit. Spaces and hyphens are ignored. | $0.002 | Base |
| POST | 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 | Base |
| POST | 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 | $0.002 | Base |
| POST | 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 | Base |
Latest checks
| When | Endpoint | HTTP | ms | Result |
|---|---|---|---|---|
| 5 days ago | checkdigit.openverbs.com/v1/ean | 402 | 680 | valid x402 v2 terms |
Income on Base (7 days)
This provider's payout address is shared by several providers, so its income is not shown as its own.
Is this your API?
<a href="https://logicnodes.io/observatory/p/checkdigit.openverbs.com"><img src="https://logicnodes.io/observatory/badge/checkdigit.openverbs.com.svg" alt="x402 status"></a>
Claim it for free with
x402_provider_claim (sign with your payout address), and get an alert within minutes when it stops answering with x402_monitor_create ($5 for 30 days). Both work over MCP (https://logicnodes.io/mcp/v2) or POST https://logicnodes.io/v1/tools/<tool>.Income is all USDC received by the provider's payout address on Base, whatever the source. Score: 0-100: 50 x share of checks in the last 72 h that returned valid x402 payment terms + 30 x min(1, log10(1 + USDC received in 7 days) / 4) + 20 x min(1, log10(1 + distinct payers in 7 days) / 3). A provider never checked scores on income only; income is all USDC received by its payout address on Base, whatever the source. JSON: /v1/observatory/providers/checkdigit.openverbs.com