E-signature API for AI agents and developers to send legally binding contracts via MCP server, REST API or CLI
Stage
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Founded
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Based in
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Pricing model
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Paid
Pricing
Free: 1 document per month, up to 2 signers per document. Pro: $7/month for 20 documents per month, up to 4 signers per document. Pro Max: $20/month for unlimited documents and unlimited signers per document.
$0.25 per contract sent; $0 monthly fee; 20 free contracts to start
Key features
No registration required
Free first document
Blockchain-secured storage
Unlimited participants
Over 100 signature fonts
AI document review
Signing status tracking
Email reminders
Markdown and Word document templates with variables
MCP server with twelve tools for template and contract management
REST API with JSON over HTTPS
Test mode with no charge
Signed webhooks for contract events
Audit log with IP address, device and timestamp
Custom branding on signing pages and documents
Gilberto AI writing assistant for template drafting
No per-signer or per-seat charges
CLI for contract operations
What makes it different
Free signing without registration required
Blockchain-secured document storage
Legally binding digital signatures across multiple jurisdictions
No limit on number of signers
Eco-friendly paper-free service
Pay per contract sent, not per month or per seat
No credit card required to start, 20 free contracts included
Integrated with official MCP registry for AI agent use
Lowest published API pricing compared to DocuSign, Dropbox Sign, and others
DocuChain
APISign