Welcome

The Dropbox Sign API (formerly HelloSign) lets you add legally binding eSignatures to your product: send documents for signature, embed signing and requesting in your own app, reuse templates, track signature requests through callbacks, and manage accounts, teams, API apps and faxes.

What you'll find hereCopy Anchor Link

• API Reference: all 74 operations grouped by resource (Signature Request, Template, Embedded, Unclaimed Draft, Bulk Send Job, Account, Team, API App, OAuth, Report, Fax, Fax Line), with request and response examples and a live API playground.
• SDKs: client libraries for C#, Python and TypeScript, generated by APIMatic, with code samples on every endpoint.
• Context Plugin: brings the Dropbox Sign API and SDKs into AI coding assistants such as Claude Code, Cursor and Codex.

Base URLCopy Anchor Link

https://api.hellosign.com/v3

AuthenticationCopy Anchor Link

Use your API key with HTTP Basic auth: the key is the username and the password is empty.

Authorization: Basic base64("$DROPBOX_SIGN_API_KEY:")

Apps acting on behalf of other users send an OAuth access token instead:

Authorization: Bearer $ACCESS_TOKEN

Find your API key in your Dropbox Sign account settings. See Authentication for details. Set test_mode to true on signature requests while you build: test requests are free and not legally binding.

Common tasksCopy Anchor Link

• Send a document for signature: POST /signature_request/send
• Send a signature request from a template: POST /signature_request/send_with_template
• Check the status of a signature request: GET /signature_request/{signature_request_id}
• Download the signed files: GET /signature_request/files/{signature_request_id}
• Get an embedded signing URL: GET /embedded/sign_url/{signature_id}
• List your templates: GET /template/list