The new standard in

The first blockchain-powered e-signature API. Built by developers for developers.

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Secured with the Ethereum blockchain

Permanent proofs

Signed documents remain sealed and immutable.


Trace the documents and versions back to their source.


Verify the content, data, and managers of a signed file.


Signatures are valid and legally binding just as on paper.

API first

SignTag is an API-first service that allows for rapid and seamless integration. It connects to the blockchain and does all the work for you.

curl --request POST \
  --url \
  --header "Authorization: Bearer $SIGNTAG_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{"signiture": { owner, receiver }}'

Advanced and straightforward API gateway

API dashboard

API dashboard

  • Comprehensive documentation
  • Powerful yet seamless integration
  • Connect on web and mobile
  • Lightweight and easy set-up
For your business

For your business

  • Secure 2FA sign-in
  • Legally binding
  • Digitize your workflow
  • No set-up fees
  • No sales call needed
Advanced features

Advanced features

  • Assign multiple participants to a folder
  • Legally binding
  • Decline signing
  • And more coming

Pricing models

Pricing info coming soon, stay tuned and sign up for updates.

Sign up for early access

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