SignSimple
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Send PDFs for legally binding e-signature, free and unlimited: emailed signing links, status tracking, and free legal templates (NDA, lease, and more).
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SignSimple's free e-signature workflow is fully programmable. Whether you're an agent, an assistant, or a developer: send a PDF, get it legally signed, and download the certified result — through MCP or plain REST.
Create a free account, then mint a key on yourprofile page. Keys look likess_live_..., are shown once, and are stored only as a hash. Send the key with every request asX-Api-KeyorAuthorization: Bearer ss_live_....
2. Connect via MCP (recommended for agents)
A hosted Model Context Protocol server runs athttps://signsimple.app/mcp(Streamable HTTP). It exposes four tools:send_for_signature,get_document_status,list_documents, andlist_templates. Discovery works without a key; account tools need one. Example client configuration:
{ "mcpServers": { "signsimple": { "type": "http", "url": "https://signsimple.app/mcp", "headers": { "Authorization": "Bearer ss_live_YOUR_KEY_HERE" } } } }
In Claude Code:claude mcp add --transport http signsimple https://signsimple.app/mcp --header "Authorization: Bearer ss_live_..."
Full OpenAPI 3.1 spec at/openapi.json. Send a document:
curl https://us-central1-signsimple-app.cloudfunctions.net/agentSend \ -H "Content-Type: application/json" \ -H "X-Api-Key: ss_live_YOUR_KEY_HERE" \ -d '{ "documentUrl": "https://signsimple.app/templates/nda.pdf", "documentName": "Mutual NDA.pdf", "recipients": [ { "name": "Jordan Lee", "email": "jordan@example.com" } ], "expiresInDays": 14 }'
The response includes theenvelopeIdand each recipient's signing link. Recipients are emailed automatically; signature and date fields are placed on the last page unless you pass afieldsarray with exact geometry. Then poll:
curl https://us-central1-signsimple-app.cloudfunctions.net/agentStatus \ -H "Content-Type: application/json" \ -H "X-Api-Key: ss_live_YOUR_KEY_HERE" \ -d '{ "envelopeId": "env_1786..." }'
When every recipient has signed, the status response carriessignedPdfUrl: the final PDF with every signature and a certificate page listing each signer, timestamps, and the SHA-256 hash of the original document.
- /llms.txt— plain-language overview for LLMs
- /openapi.json— OpenAPI 3.1 spec
- /.well-known/agent-card.json— agent card (capabilities + interfaces)
- /.well-known/mcp.json— MCP server discovery
- https://signsimple.app/mcp— the MCP endpoint itself
Every template in thefree template gallery(NDA, lease, contractor agreement, liability waiver, bill of sale, promissory note) has a stable PDF URL you can pass straight tosend_for_signatureasdocumentUrl.
The API is free, like the rest of SignSimple: no per-document fees and no monthly caps. PDFs up to 15 MB, up to 10 recipients per send, up to 5 active API keys per account. Signed documents are legally binding under the U.S. ESIGN Act.
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