Appyflow and gstinapi.in are the two providers that publish a ₹0.40 GST lookup rate. They get there differently, and which is cheaper depends on how much you recharge at a time. The numbers below come from each provider’s own page.
| Appyflow | gstinapi.in | |
|---|---|---|
| Free trial | 50 free requests. | Up to 100 free lookups — 25 on signup, 25 for each of three setup steps. Never expire. |
| Price per lookup | ₹0.50 per request when a recharge is under ₹1,000; ₹0.40 per request when it is over ₹1,000. | ₹0.40 to ₹0.80, by pack. ₹0.40 on the 6,250-credit pack. |
| How you get pricing | Published, self-serve. | Published, self-serve. Buy a pack, no sales call. |
| Return-filing data | Their docs list a filing field and a compliance section with filing frequency; the example response on the page shows them empty, so we cannot say what they return in practice. | Yes — GET /v1/gstin/{gstin}/returns lists every GSTR-1 and GSTR-3B filed in a financial year with dates and ARNs; /compliance summarises it; /filing-preference gives the QRMP cadence. |
| Integration | REST API; returns trade and legal name, address, registration date, business type, status and jurisdiction. | One header (x-api-key), official Node.js and Python libraries, OpenAPI spec, a free test GSTIN that never spends a credit. |
Appyflow details are what its own page states, read on September 19, 2026; where the page shows nothing we say so rather than guess. Source: appyflow.in/verify-gst/. Providers change their pricing — check with them before committing volume, and tell us if anything here is out of date.
The fastest honest comparison is your own vendor list through both. Sign up, copy the key and run this. The test GSTIN 00AAAAA0000A1ZT returns a fixed response and never spends a credit.
curl "https://www.gstinapi.in/v1/gstin/22AAAAA0000A1Z5" \ -H "x-api-key: gak_your_api_key"
No credit card. Credits never expire.
Sometimes. Appyflow charges ₹0.50 per request on a recharge under ₹1,000 and ₹0.40 above it. gstinapi.in charges ₹0.40 to ₹0.80 per lookup depending on the pack, prepaid, with the lowest rate on the 6,250-credit pack. Prices exclude 18% GST. So Appyflow is cheaper on very small top-ups and on recharges between ₹1,000 and ₹2,499, and the two match at ₹0.40 from the 6,250-credit pack upward. Prices as published on September 19, 2026, exclusive of GST.
Their documentation lists a filing field and a compliance section containing filing frequency, but the example response on their page shows those values empty, so we cannot confirm what it returns for a live GSTIN. gstinapi.in has a dedicated returns endpoint with every GSTR-1 and GSTR-3B filed in a financial year, including dates and ARNs.
Appyflow gives 50 free requests. gstinapi.in gives up to 100 free lookups — 25 on signup and 25 for each of three setup steps on the dashboard — and the credits never expire.
Both are plain REST APIs that take a GSTIN and return JSON, so the change is a URL, one header and a field-name mapping. Start on the free lookups, run your own GSTINs through both, and compare the responses before moving any volume.
More: all providers compared · Cashfree alternative · Surepass alternative · free GST API options