CheckSlip

A remote MCP server (Streamable HTTP) for verifying Thai bank transfer slips. It exposes MCP tools over HTTP so any MCP-compatible client (Claude, Cursor, VS Code, Gemini CLI, Codex CLI, …) can verify a slip's amount, receiver, transfer date, and detect duplicate usage.

• Website: https://thaibankslip.com
• MCP endpoint: https://thaibankslip.com/mcp
• Connect guides (per client): https://thaibankslip.com/docs

Get started

1. Create a merchant account at https://thaibankslip.com/merchant/register (free trial tokens included). Copy your API Key — it is shown once.
2. Add the MCP server to your client using the endpoint https://thaibankslip.com/mcp (step-by-step for each client at /docs).
3. When your client opens the sign-in page, enter your Merchant Name and API Key. That's it — the check_slip tool is now available to your AI agent.

Endpoints

• POST /mcp — MCP Streamable HTTP (initialize + requests). Requires a valid OAuth access token (Authorization: Bearer <token>).
• GET /mcp — MCP server-to-client stream (requires an active session)
• DELETE /mcp — terminate an MCP session
• GET /health — { "ok": true, "name": "CheckSlip MCP", "version": "1.0.0" }
• GET / — basic server info
• OAuth (public): GET /.well-known/oauth-protected-resource, GET /.well-known/oauth-authorization-server, POST /register (DCR), GET|POST /authorize, POST /token

Authentication (OAuth 2.1)

The /mcp endpoint is protected by an OAuth 2.1 Authorization Code flow with PKCE, designed for MCP clients like Claude's custom connector:

1. The client reads /.well-known/oauth-protected-resource (advertised via the WWW-Authenticate header on a 401) to discover the authorization server.
2. It registers dynamically via POST /register (DCR), then opens /authorize in a browser.
3. You sign in with your Merchant Name and API Key. On success an authorization code is redirected back.
4. The client exchanges the code at /token (verifying PKCE) for a short-lived access token plus a rotating refresh token — all handled automatically by your MCP client.

MCP tools

check_slip

Verifies a slip via a slip image, a QR payload, or a transaction reference.

Input:

{
  "slip_image_base64": "base64 PNG/JPEG (optional)",
  "qr_payload": "string (optional)",
  "transaction_ref": "string (optional)",
  "expected_amount": "number > 0 (optional)",
  "expected_receiver_name": "string (optional)",
  "expected_receiver_account_last4": "4 digits (optional)",
  "expected_transfer_date": "YYYY-MM-DD (optional)",
  "order_id": "string (optional)",
  "mark_as_used": "boolean (default false)"
}

At least one of slip_image_base64, qr_payload, or transaction_ref is required. When only slip_image_base64 is given (raw base64 or a data:image/...;base64, data URL), the server decodes the QR code from the image and uses it as the QR payload. The result is returned as JSON text content with status one of verified | failed | duplicate | provider_error | config_error.

Comparison rules:

• Amount: exact numeric match.
• Receiver name: case-insensitive, whitespace-trimmed.
• Receiver account last 4: digits only.
• Date: compares the YYYY-MM-DD part of the slip's transfer datetime.
• Fields you don't pass are omitted from checks (not reported as false).

When mark_as_used is true and all checks pass, the slip's transaction id is recorded so future checks of the same slip return status: "duplicate".

slip_checker_status

Returns configuration/health without exposing secrets (provider readiness, duplicate-detection scope, your remaining token balance, auth configuration).

Tokens & pricing

1 token = 1 slip check. New merchants get free trial tokens; buy more from your dashboard at https://thaibankslip.com/merchant (Stripe Checkout, THB). See all packages at https://thaibankslip.com/#pricing.

Warning

This server verifies slips through a provider API, never from the picture alone. When you pass slip_image_base64, the server only reads the slip's QR code from the image and forwards that QR payload to the provider; the rest of the image is not trusted. Slips without a readable QR code must be supplied as a qr_payload or transaction_ref instead.