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The DualEntry Public API is a RESTful, JSON-based, server-to-server interface for reading and writing your organization’s accounting data. Requests authenticate with an API key in the X-API-KEY header, sent to https://api.dualentry.com; every endpoint requires authentication and is rate-limited. See Versioning for how the API is versioned and which version to build against.

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What you can build

DualEntry’s policy is that anything you can do in the DualEntry UI, you can do through the API. If you find a gap where that isn’t true, reach out and we’ll close it.

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What this section covers

  • Quickstart: get an API key and make your first authenticated request in under five minutes.
  • Authentication: how API keys work, the roles they carry, and both 403 failure modes.
  • API Keys: issue, send, and replace an API key.
  • Core Concepts: rate limits, pagination, errors, and idempotent writes.
  • Building Blocks: task-specific guides for attachments, bank feeds, and tax.

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Where to go next

If you’re building a production integration for the partner program rather than a one-off script, see How Custom Integrations Work.
Last modified on September 23, 2026