Jun 2026 Developer resources
How to integrate an eSignature API: A developer’s tutorial
Learn how to integrate an eSignature API into your app. Authentication, sending documents, templates, webhooks, and a production checklist.
Everything you need to ship eSignatures in a day
Build on a REST API, automate from your AI assistant or terminal, and ship with the same compliance and uptime that more than 65,000 businesses trust in production.
10,000,000+ documents signed
99.99% uptime reliability
< 1 day average integration
SOC 2 + HIPAA compliant
Build with SignWell
Pick the integration path that fits how you work
Use the API for full control, MCP to work from your AI assistant, the CLI for terminal and automation, or the SDKs we are shipping next.
Official SDKs
Language-native libraries that wrap the API in idiomatic code. Start with the SDKs available today (Ruby, Node, Python), with more on the way.
SignWell API
Embed legally binding signatures with a clean REST API. Templates, text tags, embedded signing, webhooks, bulk send, and a full audit trail. Pay as you go for usage, with the first 25 free every month.
SignWell CLI
Send, track, and download signed documents from your terminal. Run headless in CI/CD, bulk send from CSV, and install AI agent skills for Claude Code, Cursor, and other coding assistants.
SignWell MCP Server
Send, track, and sign documents directly from Claude, Cursor, or any MCP-compatible AI client. Install in one click from the Anthropic Connectors directory.
Reference documentation
Everything your team needs to read, try, and ship
Before you start: Create a free account at signwell.com/sign_up to get an API key. Test mode is unlimited, so you can send real API calls without sending real documents.
The full reference covers every endpoint, request, and response examples, webhook payloads, and rate limits.
Developer resources
Guides and tutorials from the SignWell team
Written for engineers shipping real integrations. Start with the basics, then dig into specific stacks and use cases.
Jun 2026 Developer resources
A Developer’s Guide to eSignature Compliance: HIPAA, eIDAS, ESIGN, UETA, and GDPR
HIPAA, eIDAS, ESIGN, UETA, GDPR, and SOC 2. What each regulation requires and what to build into your integration.
May 2026 Developer resources
Send eSignatures from the Command Line with the SignWell CLI
A developer's guide to the SignWell CLI. Send eSignatures, run bulk sends, manage templates, and wire eSignature workflows into CI/CD or AI agents from your terminal.
From document to audit trail
The same workflow powers the API, the CLI, the MCP server, and every integration built on SignWell.
01 / CREATE: Prepare and templatize
Use text tags to automatically place signature fields, or call a reusable template to standardize compliance workflows across thousands of users.
02 / EMBED: White-label signing
Keep users inside your product with the Embedded Signing API. Your logo, your colors, your domain, our infrastructure.
03 / LISTEN: Webhooks and events
Receive real-time events the moment a document is viewed, signed, declined and more. Trigger downstream logic without polling.
04 / ARCHIVE: Audit and retrieve
Pull the completed document as a tamper-proof PDF, along with a full audit trail that includes the IP address, timestamp, and email for every signer.
Built for engineers who want to ship
Clean REST design, honest pricing, and a roadmap pointed at the tools you actually use.
Live in less than a day
Most teams go from zero to a working integration the same day they pick up the docs. No sales call required.
Pay-as-you-go pricing
No seat limits, no monthly minimums, no hidden fees. Your first 25 documents every month are free. After that, paid docs start at $0.85 and decrease with volume.
Production-grade by default
99.99% uptime, SOC 2 Type II, HIPAA, GDPR, ESIGN. The same platform that has processed over 10 million documents for 65,000 businesses.
Ready for the AI stack
Installable CLI skills for the AI coding agents your team already uses and a native MCP support for AI clients. More tools on the way.
Developers on SignWell
I am so impressed with the SignWell API. In less than a day, I moved from never using SignWell to a fully functional automation powered by the API. I got precisely the workflow we needed.
Brian Richards, Web Developer
WPSessions
Once I reviewed the API documentation and tested it, I knew this was the right choice. I did not have to deal with unnecessary complexity. Their API did exactly what we needed and nothing more. That focus made the integration quick and painless.
Franklin Tarter, CTO
SunRaise Capital
SignWell’s API makes this super simple. Their documentation and examples are fantastic. After working with a ton of electronic signature tools, we chose to integrate SignWell directly into ConveYour. We recommend them to everyone now.
Stephen Rhyne, CEO and Founder
ConveYour
Start building today
Sign up for your free account, send your first test document, and ship the integration your team has been putting off.