The GST API for developers who actually have to ship. Direct GSP-licensed connection to GSTN. SDKs in 5 languages. 99.99% uptime SLA.
Most 'GST APIs' on the market are resold from a real GSP — your request goes through their server before it reaches GSTN. That's 200–600ms of extra latency on every call. WhiteBooks holds its own GSP license. Your request goes one hop, not two.
Some providers wrap the GSTN's underlying APIs without modernization — leaving you to handle XML payloads, SOAP envelopes, and undocumented error codes. WhiteBooks normalizes everything to clean JSON with well-typed errors.
Sandbox environments at most providers respond differently from production — different rate limits, different error shapes, different success conditions. WhiteBooks sandbox is bit-for-bit identical to production behavior.
Validate any GSTIN against the GSTN registry. Returns legal name, trade name, registration status, state code, and constitution.
Push GSTR-1 outward-supply data — B2B, B2CL, CDNR, exports, HSN summary — as clean JSON before you file the return.
File GSTR-3B straight to GSTN. JSON in, ARN out. Both EVC and DSC signing supported, with idempotent retries on timeout.
Pull the full GSTR-2B for any return period: ITC eligibility, vendor-wise breakup, and every section in one call.
Read live cash and ITC ledger balances across IGST, CGST, SGST, and cess for any monitored GSTIN.
Generate a GST payment challan (PMT-06) via API and get the CPIN back for online or over-the-counter payment.
View and track the filing status of every GSTR across return periods — filed, pending, or overdue — for any GSTIN.
File ITC-04 job-work returns for goods sent to and received back from job workers, straight over REST.
Fetch the full IMS inbox for a GSTIN — all inward invoices pending accept, reject, or pending action, with ITC eligibility flags.
File the GSTR-9 annual return for a taxpayer. Consolidates all monthly return data into the annual statement and submits to GSTN.
Official SDKs in Node.js, Python, PHP, Java, and Go. Community SDKs in Ruby, .NET, Elixir. All on github.com/whitebooks. First-class support for Express, FastAPI, Django, Laravel, Spring Boot, and Gin.
Native connectors for instant data flow
Maintained against every ERP upgrade
No CSV exports. No email uploads.
Bank-grade security & data protection
WhiteBooks runs a shared AI engine across every product. Trained on Indian compliance data, tuned for finance teams, and embedded in the workflows you already use.
Every endpoint returns responses with consistent field naming and explicit type information. Easy to feed into agentic workflows or AI-driven reconciliation systems.
When GSTN rejects a return, the error code is returned alongside a plain-language explanation and a suggested fix. The kind of thing that saves you from grep-ing GSTN's PDF documentation at 2am.
Type "show me all October vendors with ITC variance above 10%" or "which clients haven't filed 3B for September?" — answers draw from your live data with source rows linked.
Combine the GST API with the WhiteBooks reconciliation models to build your own fraud detection, ITC optimization, or anomaly flagging — directly on your customers' data, in your product.
Sign up, get sandbox keys, run the quickstart. Production access in 5 business days after KYC. No procurement-cycle minimum — Startup tier starts at ₹14,999/month.
