https://www.gstinapi.in/blog Sourced, dated explainers on GSTIN verification, GST return history and GST compliance data. en-IN https://www.gstinapi.in/blog/gstin-format-explained https://www.gstinapi.in/blog/gstin-format-explained Sun, 04 Oct 2026 00:00:00 GMT A GSTIN is 15 characters: state code, PAN, entity code and a check character. See what each part means, the checksum as working code, and what it cannot prove. https://www.gstinapi.in/blog/read-vendor-gst-return-history https://www.gstinapi.in/blog/read-vendor-gst-return-history Sun, 04 Oct 2026 00:00:00 GMT What GSTR-1 and GSTR-3B show, how to read a real filing history month by month, and what a gap can and cannot tell you about a supplier. With a live example. https://www.gstinapi.in/blog/monthly-vs-quarterly-gst-filers-qrmp https://www.gstinapi.in/blog/monthly-vs-quarterly-gst-filers-qrmp Sun, 04 Oct 2026 00:00:00 GMT A quarterly GST filer legitimately shows no return for two months out of three. How the QRMP scheme works, its due dates, and how to check a vendor's choice. https://www.gstinapi.in/blog/search-gstin-by-company-name https://www.gstinapi.in/blog/search-gstin-by-company-name Sun, 04 Oct 2026 00:00:00 GMT The GST portal searches by GSTIN, PAN, temporary ID and composition status, not by name. What that means, and the routes that do work from a company name. https://www.gstinapi.in/blog/check-gst-supplier-before-paying-itc https://www.gstinapi.in/blog/check-gst-supplier-before-paying-itc Sun, 04 Oct 2026 00:00:00 GMT Five checks to run on a supplier's GSTIN before you pay, and how a cancelled registration or unfiled returns bear on your input tax credit under Section 16. https://www.gstinapi.in/blog/live-vs-cached-gst-data https://www.gstinapi.in/blog/live-vs-cached-gst-data Sun, 04 Oct 2026 00:00:00 GMT A cached GSTIN record can say Active after a registration was cancelled. Why we never cache lookups, the one place we store snapshots, and how to test any API. https://www.gstinapi.in/blog/check-gstin-from-claude-mcp-server https://www.gstinapi.in/blog/check-gstin-from-claude-mcp-server Sun, 04 Oct 2026 00:00:00 GMT Set up the gstinapi MCP server in Claude Desktop or Claude Code to verify GSTINs and read GST filing history in conversation. Seven tools and the config. https://www.gstinapi.in/blog/gstin-complete-profile-endpoint https://www.gstinapi.in/blog/gstin-complete-profile-endpoint Sun, 04 Oct 2026 00:00:00 GMT GET /v1/gstin/{gstin}/complete returns registration, constitution, filing frequency and last filed GSTR-1 and GSTR-3B in one 2-credit call. A live example.