The CodeClassify API
Everything the free tools do — as a deterministic, pay-per-use API. Validate barcodes in bulk, classify businesses into NAICS/SIC, find HS codes, check IBANs. Same input, same output, every time.
Endpoints
| Endpoint | What it does |
|---|---|
POST /v1/gtin/validate | Validate up to 100 GTIN/UPC/EAN barcodes per call |
POST /v1/gtin/check-digit | Compute the check digit for a new barcode |
POST /v1/gtin/convert | UPC-A ↔ EAN-13 + GTIN-14 case codes |
POST /v1/isbn/convert | ISBN-10 ↔ ISBN-13 conversion & validation |
POST /v1/iban/validate | Validate up to 100 IBANs per call (MOD-97) |
GET /v1/naics/search | Business description → NAICS 2022 codes |
GET /v1/sic/search | Search SIC 1987 codes |
GET /v1/crosswalk/sic-naics | Official SIC ↔ NAICS concordance |
GET /v1/hs/search | Product description → HS customs codes |
Pricing
| Plan | Price | Calls included | When you run out |
|---|---|---|---|
| Free | $0 | 25 / month | Buy credits or upgrade |
| Credits (pay-per-use) | $10 one-time | 1,000 credits, never expire | Buy another pack ($0.01/call) |
| Pro | $9.99 / month | 2,000 / month | Credits cover the overflow |
| Ultra | $49.99 / month | 15,000 / month | Credits cover the overflow |
Failed or invalid requests are never billed. Monthly allowances reset on the 1st; unused credits roll over forever.
Payments are processed securely by Stripe. Your API key is delivered instantly after checkout.
Get your free API key
25 calls per month, no credit card. Enter your email and get the key instantly:
Prefer RapidAPI? The API is also launching there. Email us for early access — early users get an extended free tier.
Why deterministic beats AI for codes
LLM-based classifiers can return different answers for the same input — and sometimes invent codes that do not exist. CodeClassify computes results from official public-domain datasets (U.S. Census NAICS/SIC, U.S. HTS) and standard algorithms (GS1 Mod-10, ISO 13616). Same input, same output, auditable and repeatable — which is what you want in feeds, compliance and data pipelines.
Classification results are suggestions computed from public data, not official rulings or legal advice.