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SpeyBooks Documentation

SpeyBooks is a programmable accounting system for UK developers and contractors. API-first, double-entry, MTD-compliant.

What is SpeyBooks?​

SpeyBooks treats your accounting like infrastructure:

  • API-first — Every feature accessible via REST API
  • Double-entry — Proper accounting, not simplified nonsense
  • MTD-native — Built for Making Tax Digital from day one
  • No lock-in — Export everything via SQL, CSV, or API

🚀 Getting Started

Create your first invoice in under 5 minutes.

Quick Start →

📖 API Reference

Complete reference for all API endpoints.

View API Reference →

Base URL​

All API requests use the following base URL:

https://api.speybooks.com/v1

Authentication​

SpeyBooks uses API keys for authentication. Include your key in the Authorization header:

curl https://api.speybooks.com/v1/invoices \
  -H "Authorization: Bearer sk_live_your_api_key"

See Authentication for details on obtaining and managing API keys.

Need help?​