Secure, Scalable eSignature
API for Developers
Add electronic signature capabilities to your platform in minutes. Build embedded signing workflows and automate document signing, verification, and tracking using our eSignature API.
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Signature eSign solutions
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Embedded Signing API
- Allow users to review and sign documents without leaving your web or mobile app.
- Send signature requests directly through your eSignature integration.
- Support multi-step signing flows with multiple signers and actions per signer.
- Increase document completion rates and streamline user workflows.
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Custom Branding & White-Label eSignature
- Replace Blueink logos with your own brand assets and design styles.
- Match signing pages to your website’s colors, fonts, and layout.
- Customize notification emails, signer pages, and confirmation screens.
- Deliver a white-label eSignature experience that strengthens brand trust.
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Real-Time Webhooks & API Events
- Receive instant updates when documents are signed, completed, or expire.
- Automate workflows triggered by signing, rejection, or completion events.
- Maintain real-time status sync across CRMs, HR systems, or databases.
- Eliminate manual tracking with automated webhook integrations.
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Smart Auto Field Placement
- Use text field or placeholders to predefine where signers must enter data.
- Automatically convert tags into form fields during upload.
- Reduce setup time with intelligent auto-field recognition.
- Minimize human error with consistent document formatting.
Multi-Layer Identity Verification
- Verify signer identity via government ID, selfie match,or SMS PIN.
- Add verification layers based on document sensitivity.
- Protect against fraud with secure signer authentication flows.
- Comply with eIDAS, ESIGN, and other verification standards.
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Custom Reminders & Signer Control
- Schedule reminders based on signer order or specific time intervals.
- Customize email and SMS notifications for each recipient.
- Improve completion rates with automated reminder campaigns.
- Reduce manual tracking by letting the API handle notification timing.
Secure, Compliant eSignature API Built for Global Standards
FERPA, and more.
API tools and support that developers will love
High-Quality Documentation
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Developer-Ready SDKs and Tooling
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Dedicated API Success Team
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Robust and Reliable Infrastructure
Start Building with Blueink’s eSignature SDKs
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Python SDK
JavaScript SDK
PHP SDK
Why Choose Blueink’s eSignature API
99.99%
200ms
30M+
50%
Pay for the eSignature API usage you need
Volume Discounts
API Envelopes
$0.95
53% DISCOUNT
What’s Included
Volume Discounts
No Expiration
Free to Test
Up to 5 users
Developer dashboard
API Envelopes
Price per Envelope
Discount
Up to 1,000
$0.95
Scale pricing as you grow
5,000
$0.75
Save 21%
25,000
$0.60
Save 37%
100,000
$0.45
Save 53%
250,000
$0.35
Save 63%
500,000
$0.28
Save 71%
1,000,000
Best Value
$0.24
Save 75%
Up to 1,000
Scale pricing as you grow
$0.95
per envelope
5,000 Envelopes
Save 21%
$0.75
per envelope
25,000 Envelopes
Save 37%
$0.60
per envelope
100,000 Envelopes
Save 53%
$0.45
per envelope
250,000 Envelopes
Save 63%
$0.35
per envelope
500,000 Envelopes
Save 71%
$0.28
per envelope
1,000,000 Envelopes
Best Value
Save 75%
$0.24
per envelope
Developer Resources for the Blueink REST API
Installation
SDK
How-to Guides
Postman Collection
API Endpoints
Live Examples
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FAQs
An eSignature API allows developers to integrate electronic signature capabilities into any website, app, or platform. You can send, sign, verify, and track documents programmatically with secure, compliant workflows.
Blueink helps developers launch faster with robust SDKs, flexible REST endpoints, 99.99 % uptime, enterprise-grade compliance, and cost-effective pricing (typically 50 % more affordable than competitors.)
Blueink’s embedded signing API lets users sign documents directly within your app or website, with no external redirects. This ensures a seamless, white-label signing experience that increases completion rates and user engagement.
Blueink offers SDKs for Python, JavaScript, and PHP, with more languages coming soon. Each SDK includes code samples, documentation, and sandbox environments for quick implementation.
Yes. Blueink meets the highest global security standards including SOC 2 Type II, HIPAA, eIDAS, GDPR, and ESIGN. All data is protected using AES-256 encryption both at rest and in transit.
Developers can use Blueink’s free sandbox environment to explore all API features. You can create and test embedded signing flows, webhooks, and document templates safely before production deployment.
Yes. Blueink complies with eIDAS (EU), ESIGN Act (US), and UETA (US), ensuring every signature is legally valid and enforceable across multiple jurisdictions.
The cost of Blueink’s eSignature API depends on your usage and plan. API credits start at $0.95 per envelope, with volume discounts that can reduce the cost to $0.24 per envelope. Visit our pricing page for full details.
You can create a free sandbox account or request a demo. Follow the installation guide, review the SDK documentation, and begin sending your first eSignature API requests in minutes.
API plans include a limited number of “regular” Envelopes, allowing you to send Envelopes from the Blueink Dashboard and via the API. However, if you need to regularly send Envelopes from the Dashboard and via our API, an Enterprise plan is probably the best fit for your organization. Please contact our sales team to discuss options.
Yes, for many standard eSignature workflows. Blueink supports document sending, embedded signing, templates, webhooks, tracking, and API automation. If your Docusign implementation relies on broader agreement-management features, you should review those requirements before migrating.