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SignWith API changelog

Changes to the SignWith API, webhooks and MCP server, newest first. The API is versioned in its path (/api/v1); changes listed here keep existing v1 calls working unless they say otherwise.

MarkdownAsk ChatGPTAsk Claude

Updated

2 October 2026: API v1

The first public release of the SignWith API.

  • REST API v1 at https://app.signwith.co/api/v1: templates, signature requests, signers, verifying signed PDFs, credits and checkouts, and feedback.
  • API keys for live and test accounts, with full-access or read-only permission and an optional expiry date. See authentication.
  • Idempotency for every POST with the Idempotency-Key header, and rate limits of 300 requests per minute per key.
  • Webhooks for signature requests, signers and templates, signed with HMAC-SHA256. See webhook events.
  • MCP server at https://app.signwith.co/mcp with 18 tools, for Claude, ChatGPT, Cursor and other AI assistants. See AI assistants.
  • OAuth sign-in for AI assistants, with View only or Full access, managed in Settings → Connected apps.

The full spec is available as openapi.yaml.

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