Developer Documentation

Build with the eContract e-signature REST API and MCP server. Start with the quickstart, the AI agent guide, authentication, OAuth 2.1 and webhooks.

Welcome to the eContract developer portal. Send contracts for e-signature from your code or from an AI agent: create and send in one call, follow signing, hand out signing links, and download the signed PDF and the audit trail. eContract is free to use for now.

Start here

Quickstart: send a PDF to two signers and download the signed result
AI agents: the end-to-end flow for agents, and why signing stays human
MCP server: connect Claude, ChatGPT, Cursor or VS Code to https://api.econtract.online/mcp

Guides

Authentication: API keys, scopes, the machine role cap and rate limits
OAuth 2.1: let people connect your app to their workspace
Core concepts: workspaces, contract lifecycle, signers and templates
Webhooks: events, signatures, retries
Idempotency: safe retries with Idempotency-Key
Errors: the error envelope and codes
Limits and pricing: free mode and fair-use caps
Changelog
API reference: every endpoint

Base URL

https://api.econtract.online/api/v1

Authentication

Send an API key or an OAuth access token as a bearer token:

curl https://api.econtract.online/api/v1/contracts \
  -H "Authorization: Bearer cl_live_your_key_here"

Create API keys under Dashboard → API Keys (workspace owners and admins).

Machine-readable

OpenAPI: https://api.econtract.online/api/v1/openapi.json, or the YAML used by this portal, for Postman, Insomnia and code generators
MCP: https://api.econtract.online/mcp
OAuth discovery: https://api.econtract.online/.well-known/oauth-authorization-server
For LLMs: /llms.txt and /llms-full.txt