Scrawn is a billing infrastructure that lets you integrate usage-based billing into your application with a single function call.

Track billable events, calculate usage, and handle payments - all with one line of code.

Scrawn tracks user events, calculates usage, and handles payments - all behind a simple SDK. Instead of building billing logic yourself, you call event consumers and we handle the rest.

import { Scrawn } from '@scrawn/sdk';

const scrawn = new Scrawn({
  apiKey: process.env.SCRAWN_KEY!,
  baseUrl: process.env.SCRAWN_BASE_URL!
});

// That's it - track usage with one line
await scrawn.sdkCallEventConsumer({ 
  userId: 'uuid', 
  debitAmount: 69.69,
});

One line of code - That's all you need to start tracking billable events in your application.

1. Deploy Backend - Self-host the gRPC server with PostgreSQL
2. Install SDK - Add @scrawn/sdk to your application
3. Track Events - Call scrawn.sdkCallEventConsumer() whenever billable actions occur
4. Collect Payment - Call scrawn.collectPayment() when usage exceeds threshold

• API Platforms - Charge per API request
• AI Services - Bill based on compute/tokens used
• Data Processing - Track storage, bandwidth, or processing time
• SaaS Products - Usage-based pricing for any metric

• Self-Hosted - Full control over your billing infrastructure
• gRPC Backend - High-performance server with PostgreSQL
• Type-Safe SDK - TypeScript SDK with full type safety
• Framework Agnostic - Works with Express, Next.js, Fastify, tRPC, NestJS
• Production Ready - LRU caching, retry logic, error handling

Scrawn is open source and available on GitHub.