Pricing
Stronger records cost much less than the disputes they prevent
Simple pricing with no hidden fees. Every plan includes cryptographic proof, audit trails, and legal compliance.
Pay-As-You-Go
No subscription required. Buy envelope packs starting at 5. Perfect for occasional or infrequent signers who need full legal defensibility without a monthly commitment.
$2.49
per envelope
5-24 envelopes
$1.99
per envelope
25-99 envelopes
$1.49
per envelope
100+ envelopes
Single user. Same Starter features. Purchased envelopes valid for 12 months.
Or subscribe and save:
Starter
$24/mo
Billed annually at $290/yr
50 envelopes · 2 users included
- Up to 2 users (+$12/mo per extra)
- API access (standard limits)
- 311 legal templates
- Hash-chained audit trails
- Certificate of Completion
- PAdES digital signatures
- Dual RFC 3161 timestamps
- Bitcoin blockchain anchoring
- GitHub evidence anchoring
- Public verification page
- Access code authentication
- Auto reminders
- Webhooks (HMAC-signed)
- Email notifications
- 3-year document retention
- $1.50/envelope overage
Most Popular
Professional
$83/mo
Billed annually at $990/yr
250 envelopes · 5 users included
- Up to 5 users (+$10/mo per extra)
- Everything in Starter, plus:
- Higher API rate limits
- SMS OTP verification $0.05/SMS
- Plain-English document summaries
- Bulk send (up to 100/call)
- Signing order enforcement
- Geo-lock by country
- Envelope comments
- Court-ready declarations
- Custom email branding
- Identity photo capture
- Browser GPS location
- Audio & video statements
- Gov. ID verification $3/check
- KBA (knowledge-based auth) $5/session
- 7-year document retention
- $1.00/envelope overage
Business
$249/mo
Billed annually at $2,990/yr
1,500 envelopes · 20 users included
- Up to 20 users (+$8/mo per extra)
- Everything in Professional, plus:
- Team organizations
- White-label branding API
- Template CRUD API
- Audit trail export API
- VPN / proxy blocking
- Custom retention (up to 99 yr)
- Volume API rate limits
- Priority support
- 99.9% SLA guarantee
- Dedicated onboarding
- ID verification included 50/mo free
- $0.50/envelope overage
Enterprise & White Label
Run Abundera Sign under your own brand. Custom domain, your logo, your colors — your clients never see ours. Unlimited envelopes, custom SLA, dedicated onboarding, and full Template CRUD API for building your own signing experience.
Contact SalesPer-Use Add-Ons (Professional+ plans)
SMS OTP verification$0.05/SMS
Gov. ID verification$3/check
Premium ID (liveness + NFC)$5/check
KBA (knowledge-based auth)$5/session
Business plan includes 50 ID verifications/mo free. All other add-ons are pay-per-use. AI document summaries, identity photos, GPS location, and audio/video statements are included at no extra cost.
All plans include: ESIGN Act + UETA compliance, SHA-256 hash-chained audit trails, PAdES digital signatures with trusted timestamps, RFC 3161 timestamps, Certificate of Completion, cryptographic proof pages, signer evidence scoring, signing ceremony proof, tamper-evident seals, public verification page, signer decline with reason, immutable evidence storage, bot/prefetch detection, and multi-provider email delivery.
The Math
What a disputed contract actually costs
$50,000+
Average cost to litigate a contract dispute. Attorney fees, expert witnesses, discovery, and court costs add up fast — even if you win.
37% fewer
Compliance errors with proper e-signature audit trails (Aberdeen Group). Fewer errors means fewer disputes, fewer fines, fewer sleepless nights.
$36 saved
Per agreement in processing costs vs. paper (DocuSign study). Printing, shipping, scanning, filing, chasing — all gone. That's before the legal savings.
Non-repudiation
Our hash-chained audit trail + RFC 3161 timestamps make post-signature tampering detectable and signer denial substantially harder to sustain. Built for stronger post-signature proof than standard audit-trail-only workflows.
Why Abundera Sign
Compare evidence depth, not just signature collection
| Feature | Abundera Sign | DocuSign | PandaDoc | Dropbox Sign |
|---|---|---|---|---|
| Starting price (comparable tier) | $29/mo | $40/user/mo Business Pro | $49/user/mo Business | $25/user/mo Standard |
| Cost for 5 users | $65/mo | $200/mo Business Pro | $245/mo Business | $125/mo Standard |
| Cost for 10 users | $149/mo* PRO | $400/mo Business Pro | $490/mo Business | $250/mo Standard |
| Per-seat pricing | Users included per plan — not per-seat | Per user | Per user | Per user |
| Cryptographic proof | Hash chain + proof page | Audit trail | Audit trail | Audit trail |
| RFC 3161 timestamps | ✓ | ✗ | ✗ | ✗ |
| PAdES-LTA digital signatures | All plans | EU add-on only | ✗ | ✗ |
| Bitcoin blockchain anchoring | All plans | ✗ | ✗ | ✗ |
| Public verification page | ✓ | ✗ | ✗ | ✗ |
| Plain-English document summary | Professional+ | ✗ | ✗ | ✗ |
| SMS OTP verification | Professional+ $0.05/SMS | Add-on | ✗ | ✗ |
| Geo-lock by country | Professional+ | ✗ | ✗ | ✗ |
| VPN / proxy blocking | Business | ✗ | ✗ | ✗ |
| Bot / prefetch detection | All plans | ✗ | ✗ | ✗ |
| Signing ceremony proof | All plans | ✗ | ✗ | ✗ |
| Signer evidence score | All plans | ✗ | ✗ | ✗ |
| Court-ready declaration PDF | Professional+ | ✗ | ✗ | ✗ |
| Identity photo capture | Professional+ | ✗ | ✗ | ✗ |
| Browser GPS location | Professional+ | ✗ | ✗ | ✗ |
| Audio & video statements | Professional+ | ✗ | ✗ | ✗ |
| API access | All plans — included | Separate product ($600-5,760/yr) | Business+ ($49/user/mo) | Premium (custom pricing) |
| Bulk send (100+) | Professional+ | Business Pro+ | Business+ | ✗ |
| GitHub evidence anchoring | All plans | ✗ | ✗ | ✗ |
| SHA-256 + SHA-512 dual hash | All plans | ✗ | ✗ | ✗ |
| Team organizations | Business | Enterprise only | ✗ | ✗ |
| White-label branding | Business | Enterprise only | ✗ | ✗ |
| API Capabilities | ||||
| API access cost | $0 — included all plans | $600-5,760/yr separate product | $49/user/mo Business+ only | Custom pricing Premium only |
| HMAC-signed webhooks | All plans — 6 event types | Connect (Advanced+) | Business+ | ✓ |
| Template CRUD API | Business (311 built-in) | ✓ | Business+ | ✓ |
| Org / team management API | Business (12 endpoints) | Enterprise only | ✗ | ✗ |
| Audit trail API | All plans — hash-verified | ✓ | ✗ | ✗ |
| Public document verification API | All plans — no auth needed | ✗ | ✗ | ✗ |
| Signer delegation API | ✓ | ✓ | ✗ | ✗ |
| Declaration / evidence export API | Professional+ (PAdES-signed PDF) | ✗ | ✗ | ✗ |
| Envelope archive API | ✓ | ✓ | ✗ | ✗ |
| Effective cost per envelope (base) | $0.25-0.58 + add-ons if used | $1.25-4.80 | $5.00 | $1.50-2.50 |
| WORM evidence storage | All plans — 1-99yr locks | ✗ | ✗ | ✗ |
| Evidence anchors per envelope | 7 independent systems | 0 | 0 | 0 |
Competitor features and pricing based on publicly advertised materials reviewed March 2026. Availability may vary by plan, region, add-on, or enterprise contract.
PRO *10 users at $149/mo — here's what you get
✓ SMS OTP verification $0.05/SMS
✓ AI document summaries
✓ Geo-lock by country
✓ GitHub evidence anchoring
✓ Identity photo capture
✓ Browser GPS location
✓ Custom email branding
✓ 7-year document retention
✓ 250 envelopes/month
✓ Full API access included
Even at comparable tiers, competitors still don't offer cryptographic proof, RFC 3161 timestamps, PAdES digital signatures, or public verification — features included on every Abundera Sign plan.
DocuSign charges up to $5,760/year just for API access — as a completely separate product from their e-signature plans.
DocuSign API Pricing
Starter: $600/yr (40 env/mo)
Intermediate: $3,600/yr (100 env/mo)
Advanced: $5,760/yr (100 env/mo + webhooks)
Intermediate: $3,600/yr (100 env/mo)
Advanced: $5,760/yr (100 env/mo + webhooks)
Abundera Sign API
Included on every plan — starting at $29/mo
Full REST API, JWT auth, HMAC webhooks
No separate product, no extra fees
Full REST API, JWT auth, HMAC webhooks
No separate product, no extra fees
PandaDoc and Dropbox Sign also gate API access behind their highest tiers. PandaDoc pricing · Dropbox Sign pricing
Developer-First API
One API call. That's it.
Full REST API with JWT auth. Create envelopes, list status, download PDFs, verify audit trails. HMAC-signed webhooks on every event.
POST /api/v1/envelopes
Authorization: Bearer <jwt>
{
"template": "nda-mutual",
"signers": [
{"email": "alice@example.com", "name": "Alice", "role": "party_a"},
{"email": "bob@example.com", "name": "Bob", "role": "party_b"}
],
"fields": {"company_name": "Acme Corp"}
}POST /api/v1/envelopes
Authorization: Bearer <jwt>
{
"template": "nda-mutual",
"signers": [
{"email": "alice@example.com", "name": "Alice", "role": "party_a"},
{"email": "bob@example.com", "name": "Bob", "role": "party_b", "phone": "+15551234567"}
],
"fields": {"company_name": "Acme Corp"},
"sign_order": true,
"access_code": "7291",
"geo_lock": ["US", "CA"],
"expiry_days": 14,
"reminder_days": 3,
"callback_url": "https://yourapp.com/webhooks/signed"
}POST /api/v1/envelopes
Authorization: Bearer <jwt>
{
// Document & Organization
"template": "nda-mutual",
"org_id": "550e8400-e29b-41d4-a716-446655440000",
"fields": {"company_name": "Acme Corp", "effective_date": "2026-04-01"},
"locked_fields": ["company_name", "effective_date"],
"metadata": {"deal_id": "D-1042", "department": "legal"},
// Signers & Recipients
"signers": [
{"email": "alice@example.com", "name": "Alice Chen", "role": "party_a"},
{"email": "bob@example.com", "name": "Bob Smith", "role": "party_b", "phone": "+15551234567"}
],
"cc": [{"email": "legal@acme.com", "name": "Legal Team"}],
"sign_order": true,
"allow_delegate": false,
// Security Gates
"access_code": "7291",
"geo_lock": ["US", "CA"],
"block_vpn": true,
// Identity Verification
"require_photo": "required",
"require_geolocation": "optional",
"require_audio_statement": "required",
"require_video_statement": "optional",
"require_id_verification": "required",
"require_kba": "optional",
"ai_summary": true,
// PDF Customization
"watermark": "CONFIDENTIAL",
"footer": {"left": "Acme Corp", "right": "Confidential", "rule": true},
"attach_pdf": true,
// Lifecycle
"expiry_days": 14,
"retention_years": 7,
"reminder_days": 3,
"max_reminders": 5,
"message": "Please review and sign the NDA before our meeting Friday.",
// Webhook & Payment
"callback_url": "https://api.acme.com/webhooks/sign",
"payment_amount": 5000,
"payment_currency": "usd"
}FAQ
Common questions
Is Abundera Sign legally binding?
Yes. Abundera Sign complies with the Electronic Signatures in Global and National Commerce Act (ESIGN Act, 15 U.S.C. § 7001) and the Uniform Electronic Transactions Act (UETA), which together make electronic signatures legally equivalent to wet-ink signatures in all 50 U.S. states. Every signature includes a hash-chained audit trail, RFC 3161 trusted timestamp, and PAdES digital signature — providing stronger evidence than a pen-and-paper signature.
Further reading: The E-Signature Audit Theater Problem
How is this different from DocuSign or HelloSign?
Most e-signature platforms tell you a document was signed. Abundera Sign proves it. Every envelope includes a SHA-256 hash-chained audit trail, an RFC 3161 trusted timestamp from an independent authority, a PAdES digital signature embedded in the PDF, optional GitHub evidence anchoring, and a Certificate of Completion with cryptographic proof — all verifiable without an Abundera account. We also offer SMS OTP verification, geography locking, VPN/proxy blocking, and a Court-Ready Declaration for litigation.
What is an RFC 3161 trusted timestamp?
An RFC 3161 timestamp is a cryptographic proof issued by an independent Timestamp Authority (TSA) that certifies your document existed at a specific point in time. Unlike a server clock (which the platform controls), a trusted timestamp comes from a third party and cannot be backdated. This is critical for proving when a document was signed, not just that it was signed.
What is a PAdES digital signature?
PAdES (PDF Advanced Electronic Signatures) is an international standard for digitally signing PDF documents. Abundera Sign embeds a PAdES-LTA (Long-Term Archival) signature into every sealed PDF using ECDSA P-256 cryptography. This includes a Document Security Store (DSS) with the signing certificate chain and a Document Timestamp from an independent TSA, ensuring the signature remains verifiable indefinitely — even after the original signing certificate expires. Verifiable in Adobe Acrobat and any PDF reader that supports digital signatures, no Abundera account required.
Can I verify a signed document without an account?
Yes. Anyone can verify a signed document at sign.abundera.ai/verify by entering the envelope ID or uploading the PDF. The verification page shows the complete audit chain, signer details, hash integrity, timestamps, and digital signature — all publicly accessible. You can also verify the PAdES signature directly in Adobe Acrobat.
How does the hash-chained audit trail work?
Every event in the signing process (created, viewed, signed, completed) is recorded as an audit entry. Each entry’s SHA-256 hash includes the previous entry’s hash, forming an unbreakable chain. If anyone modifies or deletes a single event, every subsequent hash becomes invalid — making tampering immediately detectable. This is the same principle behind blockchain technology.
Do you offer SMS verification?
Yes. On Professional and Business plans, you can require signers to verify their phone number via SMS one-time password (OTP) before signing. This adds a second factor of authentication beyond email, strengthening signer identity verification. Each signer gets up to 3 SMS sends with a 60-second cooldown.
What happens if a signed document is disputed in court?
Abundera Sign is designed to produce a stronger evidentiary record than standard e-signature workflows. Your signed PDF includes a Certificate of Completion, Cryptographic Proof page, and embedded PAdES-LTA digital signature with 9 independent verification layers. The hash-chained audit trail, dual RFC 3161 timestamps, GitHub evidence anchor, Bitcoin blockchain anchoring, and SHA-256 + SHA-512 dual hashes create independent, third-party proof that is materially harder for any one party to falsify. Professional and Business plan subscribers can also generate a 13-section Declaration of Custodian of Records — a formal sworn declaration under 28 U.S.C. § 1746 that cites FRE 803(6), 901(b)(9), 902(11), and 902(14), with a 26-term technical glossary for the Court. Structured for use as a court exhibit, subject to counsel and local rules.
What does the Declaration of Custodian of Records include?
The declaration is a 13-section sworn PDF document with a 26-term technical glossary, digitally signed by Abundera with a PAdES-LTA signature. It covers: (1) named declarant with personal knowledge statement, (2) platform security measures including 9 verification layers, (3) document details, (4) signing process and email link delivery, (5) per-signer authentication evidence with signer evidence scoring, (6) audit chain integrity verification, (7) cryptographic hashes and anchors including dual RFC 3161 timestamps and Bitcoin blockchain proof, (8) data integrity and WORM immutability with five independent external verification systems, (9) public verification with QR code, (10) system reliability under FRE 901(b)(9), (11) records custodian statement citing FRE 803(6), 902(11), and 902(14), (12) declaration under penalty of perjury per 28 U.S.C. § 1746, and (13) venue for challenges. Third parties can also request a declaration via the public verification page.
Do you charge per user?
No. Abundera Sign charges per envelope, not per seat. Each plan includes a generous number of users — Starter includes 2 users, Professional includes 5, and Business includes 15. Additional users can be added at a low per-user cost ($10, $8, or $5/mo respectively). There are no hidden fees and no annual contracts required.
Can I use the API to send documents programmatically?
Yes. Every plan includes full API access. Create envelopes, manage templates, check status, download signed PDFs, and receive HMAC-signed webhooks on every event — all with a single API call. See the API documentation for examples.
How long are signed documents stored?
Retention depends on your plan: Starter includes 3 years, Professional includes 7 years, and Business includes customizable retention up to 99 years. Documents are stored in write-once immutable storage on Cloudflare’s global infrastructure. Once sealed, the evidence package cannot be modified without invalidating the hash chain.
What templates are available?
Abundera Sign includes 311 legally-reviewed templates across 30+ categories including real estate, employment, corporate, finance, healthcare, technology, creative, and more. All plans include access to the full template library. Business plan subscribers can also create and manage custom templates via the API.
What are the Audio and Video Statement features?
Audio and Video Statements are optional biometric verification features available on Professional and Business plans. When enabled, the signer is prompted to record themselves reading a sworn statement aloud — “I confirm that I have read and understood this document, and I voluntarily agree to its terms.” Audio captures voice biometrics (50–100KB), while Video captures both face and voice (500KB–2MB). Recordings are stored as part of the tamper-evident evidence package with SHA-256 hashes. Provides richer evidence than a standard click-to-sign flow, when appropriate for the transaction. Use only with clear disclosure, informed consent, and retention policies appropriate to the document.
What are Signing Links, Delegation, Embedded Signing, and In-Person Signing?
Signing Links (Professional+) let you create a reusable URL — each visitor gets their own envelope, perfect for waivers or onboarding forms. Signer Delegation allows a signer to hand off signing authority to someone else, with a full audit trail and chain limit. Embedded Signing lets you embed the signing experience in your own app via iframe with postMessage callbacks. In-Person Signing enables kiosk mode for face-to-face signing on a shared device — each signer sees only their own fields.
Ready to get started?
See all features in action or send yourself a demo document in under 30 seconds.