Ramp Network Webhook Verification

A minimal Node.js server that verifies Ramp Network webhook signatures.

Setup

1. Install dependencies:

npm install

2. Place your Ramp Network public key in ramp-network.public.pem

3. Start the server:

npm start

4. Optional: tunnel requests through ngrok

• install ngrok and authenticate
• start the server with npm start
• run ngrok http 3000

How it works

• Receives webhook POSTs on /
• Verifies X-Body-Signature header using secp256k1 ECDSA
• Uses stable JSON stringify for consistent message formatting
• Returns 204 for valid signatures, 401 for invalid

Dependencies

• express - Web server
• fast-json-stable-stringify - Deterministic JSON serialization

Files

• index.js - Main server (~60 lines, super simple!)
• package.json - Dependencies
• ramp-network.public.pem - Your public key file