Bring document signing into your SaaS, CRM, KYC, and onboarding workflows. With our pay-as-you-go API pricing, you pay only when documents are signed.
Per document signed via API or Embedding. Available on any plan with API access enabled.
Full audit trail & digital certificate
Real-time event notifications
iFrame & JavaScript SDK
Custom logos, colors & domains
Create, clone & manage programmatically
Free unlimited API and Embedding for development and testing. No credit card required.
Build & iterate with no limits
Same API as production
Validate your integration end-to-end
TEST watermark on all documents
Start building in minutes
From sign-up to production in minutes, not weeks.
Sign up for free and get your sandbox API keys instantly. No credit card, no commitments.
Integrate signing into your app using our API or embeddable forms. Test everything for free, unlimited.
Switch to production keys and pay only $0.20 per document signed. Scale as you grow.
Just a few lines of code to send a document for signing.
// Send a document for signing via the Zignature API
const response = await fetch('https://app.zignature.io/api/submissions', {
method: 'POST',
headers: {
'X-Auth-Token': 'YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({
template_id: 1001,
send_email: true,
submitters: [{
role: 'Signer',
email: 'recipient@example.com'
}]
})
});
const data = await response.json();
console.log(data); // { id: 42, slug: "abc123", ... }Everything you need to build powerful document signing workflows into your application.
Create, manage, and clone templates programmatically. Upload PDFs or DOCX files via API.
Send documents for signing, track status in real-time, and download completed signed files.
Get real-time notifications when documents are viewed, signed, or completed.
Embed signing directly in your app with iframes or our JavaScript SDK. Fully white-labeled.
View docs →Custom branding, colors, logos, and domains on all signing pages and emails.
ESIGN, UETA, and eIDAS compliant. Full audit trails and tamper-proof digital certificates.
Volume discounts apply automatically as you scale. Graduated pricing kicks in mid-month — no action needed, it resets each billing cycle.
| Monthly Volume | Per Document | Savings |
|---|---|---|
| Up to 500 documents | $0.20 | Standard rate |
| 500 – 5,000 documents | $0.15 | Save 25% |
| 5,000+ documents | $0.10 | Save 50% |
Everything you need to know about the Zignature API. Can't find what you're looking for? Contact our team.
Start building with our free sandbox today. No credit card needed, no time limits.