DocuSign’s API is mature — and its production plans start around $50/month before you send a single envelope. SignForge gives you free sandbox test keys, live API access on the free plan, a one-call /quick-sign endpoint, and an MCP server so AI agents can send documents too.
DocuSign prices its API as a separate product with its own plans. SignForge includes the API in every plan — starting at $0.
| Plan level | SignForge API | DocuSign API |
|---|---|---|
| Sandbox / testing | Free sf_test_ keys — quota-exempt, no expiry (watermarked, no emails) | Free developer account — envelopes not valid for legal purposes |
| Entry (production) | Free plan — 5 API envelopes/mo included | From ~$50/mo — 40 envelopes (≈$1.25/envelope) |
| Growth | Pro $15/mo — 100 API envelopes/mo | ~$300/mo (Intermediate) — 100 envelopes |
| Scale | Business $80/mo flat — 500 API envelopes/mo | ~$480/mo (Advanced) — bulk send, PowerForms |
| Enterprise | Custom — envelope-volume pricing, custom rate limits, bulk signing | Custom pricing |
DocuSign does not publish all API plan prices; figures are from independent 2026 pricing analyses of DocuSign’s developer plans and may vary by region and negotiation. SignForge figures are our published plans. Both platforms reset monthly quotas — unused envelopes don’t roll over on either.
DocuSign’s send flow is OAuth consent, then an envelope definition, documents, recipients, and tabs — assembled across multiple objects before anything goes out. SignForge’s /quick-sign endpoint sends a document for signature in a single request:
curl -X POST https://signforge.io/api/v1/quick-sign \
-H "X-API-Key: sf_live_YOUR_KEY" \
-H "Content-Type: application/json" \
-d '{
"title": "NDA Agreement",
"pdf_base64": "<base64-encoded-pdf>",
"signer_email": "jane@example.com",
"signer_name": "Jane Doe"
}'Swap sf_live_ for a sf_test_ sandbox key and the same call runs quota-free: documents are watermarked and no emails are sent, so you can integrate and test without spending anything.
The API covers the full envelope lifecycle — create, place fields, send, track, download — plus the pieces that usually cost extra elsewhere.
POST /envelopes/{id}/anchor-fields places signature fields wherever a text anchor appears in the PDF — the same pattern as DocuSign anchor tabs, no coordinates needed.
POST /envelopes/{id}/embed-url returns a URL you can drop into an iframe for in-app signing — included free, not gated behind an API plan.
Register webhooks for envelope.created through envelope.expired. Payloads are HMAC-signed and failed deliveries can be redelivered.
List templates, fetch them with their fields, and create envelopes from a template with prefilled values in one call.
GET /envelopes/{id}/archive returns every document plus the audit trail JSON in one ZIP — no stitching downloads together.
Every signed PDF embeds an open-standards proof bundle (W3C Verifiable Credential + public transparency log) that verifies offline — a moat no API plan tier can buy at DocuSign.
SignForge publishes an MCP (Model Context Protocol) server with 18 tools, so AI agents like Claude and Cursor can create envelopes, place fields, send documents, and check signing status — without you writing any glue code. DocuSign has no MCP server. If your roadmap includes agent-driven workflows, this is the difference between an afternoon and a sprint. Read the MCP server docs.
The concepts map almost one-to-one — most integrations move over in a day or two.
| DocuSign concept | SignForge equivalent | Notes |
|---|---|---|
| Envelope | Envelope | Same concept, same lifecycle states |
| Recipients / signers | Recipients | Sequential signing supported |
| Tabs | Fields / anchor-fields | Coordinates or text anchors — your choice |
| Templates | Templates API | Create envelopes from templates with prefill |
| PowerForms | Templates + /quick-sign | One call replaces the form setup |
| Connect (event delivery) | Webhooks | HMAC-signed, with redelivery |
| Bulk send | Bulk create + bulk-sign sessions | One authority can execute N envelopes in one session |
Authentication is simpler too: a single X-API-Key header instead of OAuth consent flows and JWT grants. Full endpoint reference in the API docs.
DocuSign offers a free developer sandbox account for building and testing, but envelopes sent through it are not valid for legal purposes. Production API access requires a paid API plan — independent 2026 pricing analyses put the entry Starter plan at around $50/month for 40 envelopes. SignForge includes production API access on the free plan (5 API envelopes/month) plus unlimited quota-exempt sandbox testing with sf_test_ keys.
DocuSign does not publish all its API plan prices. Independent 2026 analyses report a Starter plan around $50/month (40 envelopes), an Intermediate plan around $300/month (100 envelopes), an Advanced plan around $480/month (adds bulk send and PowerForms), and custom enterprise pricing, with overage around $1–2 per extra envelope. SignForge's published pricing: free (5 API envelopes/month), Pro $15/month (100), Business $80/month flat (500), Enterprise custom with envelope-volume pricing.
Yes. SignForge's free plan includes real production API access — 5 API envelopes per month with webhooks, embedded signing, anchor-field placement, and template endpoints included. Sandbox testing with sf_test_ keys is unlimited and quota-exempt: documents are watermarked and no emails are sent, so you can build and test the full integration without paying anything.
With SignForge, yes. We publish an MCP (Model Context Protocol) server with 18 tools that lets AI agents like Claude and Cursor create envelopes, place fields, send documents for signing, and check status. DocuSign does not offer an MCP server. This makes SignForge a natural fit for agent-driven and automation-first workflows.
Sign up free, create a sandbox key, and call /quick-sign. No sales call, no paid API plan, no expiring trial.
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