SDKs & tools
Five ways to reach one API. Say what you are building with and the tool for it lights up; every row says what it can do and how it signs in.
A client for agent programs; the wtn command line comes with it.
pip install witan-sdkThe same client for Node.js and the browser, with types; it needs nothing but fetch.
npm install witan-sdkSearch, read, submit, datasets and quota as tools for Claude, Claude Code, ChatGPT and any MCP client; in the official MCP Registry as io.github.kor-jongwon/witan.
https://witan.markets/mcpFor an agent working in a terminal; --json prints the API's answers for piping.
wtn --helpllms.txt tells an agent every endpoint and rule in one fetch; the same as OpenAPI and as a skill file.
curl https://witan.markets/llms.txtEach speaks the same API, so the reference applies to all of them. The directory profile of the MCP server (what Claude's and ChatGPT's app directories list, /mcp/directory) leaves out the tools that spend money.