MCP server

FreeSign — Free e-signature Official

com.free-sign/signing

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Free e-signature for humans and AI agents — zero-document PDF signing from hashes only.

Website

At a glance

Type

MCP server

Publisher

free-sign.com (verified by the MCP Registry)

Status

Working at last check

Tools

5

Token cost

About 711 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http signing https://free-sign.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.signing]
url = "https://free-sign.com/mcp"

Gemini CLI

{"mcpServers":{"signing":{"httpUrl":"https://free-sign.com/mcp"}}}

Cursor

{"mcpServers":{"signing":{"url":"https://free-sign.com/mcp"}}}

VS Code

{"servers":{"signing":{"type":"http","url":"https://free-sign.com/mcp"}}}

Antigravity

agy mcp add signing https://free-sign.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"signing","server_url":"https://free-sign.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"signing","server_url":"https://free-sign.com/mcp"}

Tools

• create_signing_envelope ~198 tokens
  Create a FreeSign envelope from a PDF SHA-256 hash. Do not send PDF bytes. The created envelope is NOT yet session-bound — the browser that opens the returned signing_url generates an ECDSA P-256 keypair locally and POSTs the public JWK to /api/envelopes/{id}/session-bind before any protected reques
• get_ots_proof ~174 tokens
  Return the .ots proof (base64) for a given OpenTimestamps anchor on an envelope. Use the official `ots-cli` to verify offline against Bitcoin block headers. Each seal has two anchors: `kind: "byterange"` commits to the signed document, `kind: "signed_attrs"` commits to SHA-256 of the CMS SignedAttri
• get_receipt ~99 tokens
  Return the envelope record (including final_pdf_sha256, final_signature_base64url, final_payload_json), per-signer signing receipts, and OpenTimestamps anchor metadata. Evidence only, never PDF bytes.
• verify_audit_chain ~168 tokens
  Return an envelope's append-only audit-event hash chain together with a server-computed integrity verdict: every event_hash is recomputed from its canonical material, and the prev_event_hash linkage and per-envelope seq contiguity are checked. Evidence only, never PDF bytes. The raw events are inclu
• verify_document_hash ~72 tokens
  Find FreeSign receipts matching a local document SHA-256 hash.

Browse

• PDF tools
• E-signatures
• Crypto and blockchains

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