India Invoice MCP 🇮🇳 — How can my AI agent generate a GST e-invoice (IRN) in India?

Remote MCP server that lets any AI agent generate India GST e-invoices — registering an invoice with the IRP (Invoice Registration Portal, run by GSTN) to get an IRN (Invoice Reference Number) plus the signed QR code — through the Sandbox.co.in GSP (GST Suvidha Provider). Stateless, bring-your-own credentials, never stores anything.

Live endpoint: https://inv-in.wishpool.app/mcp · Registry: app.wishpool/india-invoice-mcp

Quick start

{
  "mcpServers": {
    "india-invoice": {
      "type": "http",
      "url": "https://inv-in.wishpool.app/mcp",
      "headers": {
        "x-sandbox-api-key": "your-key",
        "x-sandbox-api-secret": "your-secret"
      }
    }
  }
}

Sign up at sandbox.co.in for GSP credentials. Your GSTIN must have GST e-Invoice API access enabled on the e-Invoice portal and mapped to Sandbox as your GSP — otherwise the IRP rejects the stamp. e-Invoicing is B2B only: both seller and buyer need valid GSTINs.

Related MCP server: GooodBilling

Tools

Owner policy guardrails ride optional headers (x-agentpay-max-amount, x-agentpay-approval-above, x-agentpay-allowed-tools) — set by the human owner in client config; the agent cannot relax them. The amount cap/threshold applies to the invoice total (INR).

GST tax split (computed for you)

The place of supply (POS) state code is compared with the seller GSTIN's state code:

• Same state → intra-state supply → CGST + SGST, each at half the GST rate.

• Different state → inter-state supply → IGST at the full GST rate.

Example: seller in state 29, buyer in state 29, one line of ₹1000 × 2 @ 18% → AssVal ₹2000, CGST ₹180 + SGST ₹180, TotInvVal ₹2360. Same line to a buyer in state 27 → IGST ₹360, TotInvVal ₹2360.

Develop

node test/serve.js   # local server on :3230
node test/e2e.js     # protocol + validation + GST math unit check + fake-key live probe

Safety

Pure stateless translation layer. The IRP/GSTN certification burden sits with the Sandbox.co.in GSP; credentials travel per-request in headers, nothing is stored. Privacy policy.

Sister servers

Mexico CFDI 4.0 e-invoices are live: inv-mx.wishpool.app. Local payments in 81 countries, one family: mcp.wishpool.app · Taiwan e-invoice 電子發票 included. More invoice countries coming: Brazil NF-e · Chile DTE · Peru CPE · Poland KSeF · Romania e-Factura · Italy SdI.

MIT licensed.