E-signatures for developers

APISign is an electronic document signing API built for developers who need to send, track, and automate legally-binding signatures without wrestling with clunky enterprise software. No per-seat licensing, no monthly minimums—just a clean REST API and a flat $0.25 per contract.

The Problem with E-Signatures

Traditional e-signature platforms were built for sales teams and HR departments, not developers. They assume you want to manually upload PDFs, drag signature fields around a canvas, and babysit each document through its lifecycle. That's fine for occasional use, but it falls apart the moment you need to send contracts programmatically—onboarding flows, marketplace agreements, automated renewals.

The existing APIs are afterthoughts bolted onto consumer-facing products. They're expensive, complicated, and riddled with arbitrary limits. You end up paying for features you don't need while fighting documentation written for a different era.

APISign flips the model. The API isn't an add-on; it's the product.

Markdown Templates

The core insight is that contracts are just structured text with a few dynamic fields. So instead of uploading Word documents and manually placing form fields, APISign uses Markdown templates with variable placeholders.

Define your contract template once using familiar Markdown syntax. Drop in {{client_name}}, {{contract_date}}, or any custom variable where you need dynamic data. When you send a contract via the API, pass your variables as JSON and APISign renders the final document automatically.

Already have contracts in Word format? The platform converts .docx files into Markdown templates automatically, preserving headings, lists, tables, and formatting. Upload once, use forever.

Real-Time Webhooks

Contracts don't exist in a vacuum. Your system needs to know when a recipient views a document, signs it, declines it, or lets it expire. APISign fires webhooks for every event, so you can update your database, trigger follow-up emails, or kick off downstream workflows the moment something happens.

No polling, no delays. Events arrive in real-time with full context: who did what, when, and on which document.

The Economics

Most e-signature platforms charge per seat, per month, plus per-envelope fees that climb as you scale. A team of five sending 100 contracts a month can easily spend $500+ on a mid-tier plan.

APISign charges $0.25 per contract. That's it. No monthly fees, no seat licenses, no API rate limits. Send 10 contracts or 10,000—the math stays simple. New accounts get 20 free contracts to test the integration without entering a credit card.

If you're building anything that touches contracts—SaaS onboarding, freelance marketplaces, property management, HR platforms—APISign is worth a look. The documentation has everything you need to send your first contract in minutes.