Free contracts, e-signatures, and invoices in one workflow
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
Freemium
Paid
Pricing
Free plan includes full invoice builder, all 5 templates, branded PDFs, payment links, and unlimited contracts with e-signature. Premium AI credits available as one-time purchases.
$0.25 per contract sent; $0 monthly fee; 20 free contracts to start
Key features
Free invoice builder with live preview and five templates
Branded invoices with logo, color, and font customization
Automatic payment link integration with Stripe and other checkout services
One-click e-signature collection without client login required
Reusable contract templates with AI-assisted drafting
Email agent that automatically follows up on unpaid invoices
Signed document vault organized per client
Automatic invoice generation from signed contracts
Sequential invoice numbering and audit-ready calculations
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
Single unified workflow from contract signing through invoice payment
Core invoicing and contracts free forever with no subscription required
Automatic email follow-up agent for unpaid invoices eliminates manual collections
Built specifically for freelancers and agencies with branding and client organization features
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
APISign