GST API comparison for developers
Compare free tier, auth, rate limits and docs quality when evaluating GST APIs.
Updated 1 Aug 2026
This comparison focuses on integrator-facing facts. Competitor claims that we cannot verify are labeled as typical market patterns — not named competitor guarantees.
APISeeker values are from our published catalog and plan config.
| Feature | APISeeker | Typical market |
|---|---|---|
| Free tier | Yes (1,000 req/mo) | Often limited trial |
| Auth | API key header | API key / OAuth mix |
| Versioned path | /v1/gstin | Varies |
| Docs + playground | Yes | Docs common; playground varies |
| Transparent INR pricing | Yes | USD-only common |