Build with SignWith
Send documents for e-signature from your own product with the REST API, or let AI assistants do it for you over MCP. Both come with every SignWith account.
REST API
E-signature API
Upload documents as templates, send them for signature, follow every signer and download the signed copy. Webhooks tell your server the moment anything changes.
20 endpoints · 11 webhook events · cURL, Node, Python
MCP server
SignWith for AI assistants
Connect Claude, ChatGPT, Cursor or VS Code, and send documents, chase signers and verify signed PDFs from a conversation.
18 tools · OAuth or API key · Streamable HTTP
Your first request
Check your API key works. How keys work
curl https://app.signwith.co/api/v1/me \
-H "Authorization: Bearer $SIGNWITH_API_KEY"Connect an assistant
One click, then sign in to SignWith. Or use the URL https://app.signwith.co/mcp.
claude mcp add --transport http signwith https://app.signwith.co/mcpBuilt for AI agents too
Every page has a Markdown copy: add .md to its URL. Agents can start from the index or read everything at once.
Start building
The API and MCP server come with every account. 3 free documents a month, then pay per document.