The short answer
BoldSign API is billed per-envelope / per-user monthly. It has a free tier: Free sandbox + Essential plan: 25 envelopes/mo. The paid plans we list start at $5/user/mo (annual) (Growth).
Plans and prices
| Plan | Price | What it covers |
|---|---|---|
| Essential (Free) | $0/mo | 1 user, 25 envelopes/month, 2 templates, audit trail, signer authentication, automated reminders, mobile apps. |
| Growth | $5/user/mo (annual) | 50 envelopes/month per user, unlimited templates, bulk send, team management; ~$15/user billed monthly. |
| Business | $15/user/mo (annual) | Unlimited envelopes, SSO, AI-powered field detection, CRM integration, custom branding, custom roles; ~$25/user monthly. |
| Premium | $99/mo (annual) | Flat rate, unlimited users, 250 envelopes/month, all Business features; ~$138/mo billed monthly. |
| Enterprise API | From $30/mo | Production API access, 40 envelopes included, $0.75 per additional envelope, embedded requesting/signing/templates, unlimited templates and sender identities. |
| Free Sandbox | $0 | Full API access for testing; documents are watermarked as test copies and deleted after 14 days. |
How BoldSign API bills you
The pricing model is per-envelope / per-user monthly. Developer-first challenger from Syncfusion with a genuinely free sandbox, transparent low pricing, and a generous 25-envelope free production tier. Best suited to: affordable, fully self-serve e-signature api for builders.
What to watch for on the bill
- Several features gated behind add-ons or higher tiers (bulk-send links, SMS auth) not always clear upfront
- 99.999% uptime is a marketing claim with no prominent public status page or SLA-with-credits doc
The pricing page we read
Source: https://boldsign.com/electronic-signature-pricing/. Prices change, so confirm there before you commit.
Compare BoldSign API with alternatives
- DocuSign eSignature API vs BoldSign API pricing
- Dropbox Sign API vs BoldSign API pricing
- PandaDoc API vs BoldSign API pricing
Other e-signature apis: DocuSign eSignature API, Dropbox Sign API, PandaDoc API, Adobe Acrobat Sign API, SignWell API.
Looking at quality rather than price? See the BoldSign API score on APIbenchmarks. Full entry: BoldSign API pricing.