Developer API

Aadhaar eSign API for developers

Add legally valid Aadhaar eSignatures to your product. Upload a PDF, add signers, and collect signatures through SignYu, all from a simple REST API.

Read the docs Start free trial

Send your first document

# 1. Create a document
curl -X POST https://signyu.com/api/v1/documents \
  -H "Authorization: Bearer sk_live_your_api_key" \
  -F "file=@agreement.pdf" \
  -F "name=Service Agreement"

# 2. Add a signer
curl -X POST https://signyu.com/api/v1/documents/{id}/signers \
  -H "Authorization: Bearer sk_live_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"signers":[{"name":"Asha Rao","phone":"9876543210","email":"asha@example.com"}]}'

# 3. Send for signature and get signing links back
curl -X POST https://signyu.com/api/v1/documents/{id}/send \
  -H "Authorization: Bearer sk_live_your_api_key"

Everything you need to collect signatures

A focused API that handles the entire Aadhaar eSign flow.

Simple REST API

Create documents, add signers, and send for signature with a handful of predictable JSON and multipart endpoints.

Aadhaar OTP eSign

Every signature is collected through an Aadhaar OTP ceremony and is legally valid under Section 3A of the IT Act 2000.

Webhooks

Get notified the moment a signer signs and when a document is fully signed. Every delivery is HMAC signed.

₹999/mo API access

Subscribe for API keys and webhooks with a 3-day free trial. Signing stays pay-as-you-go at one credit per signature.

Signing links included

The send endpoint returns a ready to use signing link for every signer, so you can embed or share them yourself.

Built for India

Backend infrastructure and document storage are hosted in India, in line with our eSign gateway agreement.

How it works

From PDF to signed document in four calls.

1. Create a document

Upload your PDF to create a document.

2. Add signers

Add up to 6 signers with name, phone, and email.

3. Send for signature

Send the document and get a signing link per signer.

4. Get notified

Receive webhooks as each signer signs, then download the final PDF.

Real time webhooks

Configure webhook endpoints in your dashboard and receive an event when a signer signs and when a document is complete. Every request is signed so you can verify it came from us.

Read the webhooks guide

Usage based, pay as you go

One credit is used per signer when you send a document. Buy credits as you need them, with no subscription required.

Get API access View pricing

# 1. Create a document curl -X POST https://signyu.com/api/v1/documents \ -H "Authorization: Bearer sk_live_your_api_key" \ -F "file=@agreement.pdf" \ -F "name=Service Agreement" # 2. Add a signer curl -X POST https://signyu.com/api/v1/documents/{id}/signers \ -H "Authorization: Bearer sk_live_your_api_key" \ -H "Content-Type: application/json" \ -d '{"signers":[{"name":"Asha Rao","phone":"9876543210","email":"asha@example.com"}]}' # 3. Send for signature and get signing links back curl -X POST https://signyu.com/api/v1/documents/{id}/send \ -H "Authorization: Bearer sk_live_your_api_key"