# zSign (zsign.io)

Sends, tracks and collects signatures on PDF documents through a REST API, with a tamper-evident audit trail and hashed documents.

- Atlas card: https://inite.ai/en/atlas/zsign.io
- Site: https://zsign.io
- For: Developers and AI agents who need e-signatures sent through an API without seat fees.
- Categories: documents
- Use 0/100 · alive 100/100

## Used for

- Send a document for signature with one API call
- Check envelope status and download signed PDFs
- Top up signing credits from a CI pipeline

## Price

- from 27 USD/one-time, no free plan (read 2026-10-24 on https://zsign.io/pricing)

## For developers

- OpenAPI: https://zsign.io/openapi.json (163 paths)
- API docs: https://zsign.io/docs/api
- MCP server: io.zsign/zsign (namespace; auth on 2026-10-24)
- Read 2026-10-24

## MCP server, measured daily

Server: https://zsign.io/mcp, checked every day since 2026-10-24 (3 checks).

- Answered: measuring, 3 daily checks so far
- Median first answer: 485 ms
- Sign-in: OAuth (the client signs the user in)
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-24

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Source: INITE Atlas, https://inite.ai/en/atlas/zsign.io. JSON: https://inite.ai/api/atlas/zsign.io. MCP: https://inite.ai/api/mcp (atlas_lookup).