The fastest Document Signing API for developers

Embed legally binding eSignatures into your app, CRM, or internal tools in minutes. A simple, robust, and highly scalable Electronic Signature API built for modern B2B workflows.

99.9% Uptime SLA
Secure & Compliant
RESTful JSON
Node.js cURL Python
// Create a sign request in Javascript
const response = await fetch('https://api.indigoesign.com/api/v1/sign-request', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${API_KEY}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    template_id: 'tpl_49382094',
    signers: [
      { role: 'Client', email: 'client@example.com' }
    ],
    webhook_url: 'https://your-app.com/webhook/esign'
  })
});

const data = await response.json();
console.log('Signing URL:', data.signers[0].signing_url);

Why choose our eSign API?

Everything you need to automate your document workflows, without the heavy lifting.

Minutes to Integrate

Our REST API is designed for developer experience. With comprehensive documentation, SDKs, and clean JSON payloads, you'll be sending your first document in minutes.

🔒

Enterprise Security

Every signature is legally binding and meets global compliance standards (eIDAS, ESIGN Act). Includes full audit trails, 256-bit encryption, and tamper-evident documents.

🔔

Real-Time Webhooks

Never poll for status updates again. Receive instant webhook notifications when a document is viewed, signed, declined, or fully completed.

Powering B2B Workflows Everywhere

SaaS Integration

For SaaS Platforms

Embed document signing natively inside your own application. Provide your users with a white-labeled or seamlessly integrated signing experience without redirecting them to a third-party app.

  • ✓ Embedded Signing Links
  • ✓ Automated NDAs & Contracts
  • ✓ Custom Branding
Internal Tools Automation

For Internal Operations

Connect Indigo eSign to your CRM (Salesforce, Hubspot) or ERP to automate HR onboarding, sales agreements, and vendor contracts. Trigger signature requests automatically based on your business logic.

  • ✓ Bulk Sending API
  • ✓ Template Pre-filling
  • ✓ Automated Routing

Ready to build with our API?

Get instant access to your sandbox environment and API keys.