Oracle3 prediction-market arbitrage checks MCP Server

Oracle3 is an open-source paper-trading engine and MCP server for prediction markets. It maps logical relations between event contracts on Kalshi and Polymarket, checks whether quoted prices break the axioms of probability after each venue's fees, and paper-trades the baskets that survive under pre-trade risk limits. It runs locally over stdio via the published package.

People who work with algorithmic trading, kalshi and polymarket and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-28 · ★ 258 · #142 OF 344 MAINTAINED FINANCE · VERIFIED 2026-09-30

Apache-2.0 · Python servers · how we verify → /methodology

01 · Install Oracle3 prediction-market arbitrage checks

Claude Code

claude mcp add yichengyang-ethan-oracle3-prediction-mar -- uvx oracle3

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "yichengyang-ethan-oracle3-prediction-mar": {
      "command": "uvx",
      "args": [
        "oracle3"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license Apache-2.0 - declared in the repository

pypi package oracle3 - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.YichengYang-Ethan is GitHub-verified and matches the repo owner

03 · What Oracle3 prediction-market arbitrage checks can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v1.2.1 · 2026-09-28

Fixes the MCP server in fresh installs. If you tried 1.2.0 and it failed to start, upgrade to this release; uv users should run uvx --refresh oracle3 mcp once. · Fixed · openai-agents now allows the mcp SDK 2.x, where…

v1.2.0 · 2026-09-28

Oracle3 is now an MCP server as well as a paper-trading engine: agents can search Kalshi and Polymarket, read quotes with each market's own fee schedule, and check whether related contracts violate probability bounds…

v1.1.2 · 2026-05-07

What's new · First release published to PyPI via Trusted Publishing (OIDC, no API tokens). · Install · \\\bash · pip install oracle3 · \\\ · Highlights · Version sync fixed (\pyproject.toml\ ↔ \oracle3/__init__.py\)…

04 · Who maintains Oracle3 prediction-market arbitrage checks

Oracle3 prediction-market arbitrage checks is maintained by yichengyang-ethan. It's the only MCP server we track from this author; the repo dates to Feb 2026.

05 · Facts

repository: github.com/yichengyang-ethan/oracle3-prediction-market-agent
website: https://yichengyang-ethan.github.io/oracle3-prediction-market-agent/
category: finance - ranked #142 of 344 actively-maintained finance servers as of 2026-09-30.
release cadence: 2 releases in the last 90 days (latest 2026-09-28)
registry: io.github.YichengYang-Ethan/oracle3 (active, first published 2026-09-28 · 2 versions)
packages: pypi:oracle3

06 · Oracle3 prediction-market arbitrage checks FAQ

What is Oracle3 prediction-market arbitrage checks?

Is Oracle3 prediction-market arbitrage checks still maintained?

Yes - as of 2026-09-30, its last commit was 2026-09-28 and it shipped 2 releases in the last 90 days. We re-verify nightly.

How do I install Oracle3 prediction-market arbitrage checks?

Run `uvx oracle3`. You can also paste the ready-made client config above.

Does Oracle3 prediction-market arbitrage checks run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Oracle3 prediction-market arbitrage checks

Alternatives to Oracle3 prediction-market arbitrage checks

Maintained finance servers if Oracle3 prediction-market arbitrage checks isn't the fit.

Pairs well with

Servers that cover what Oracle3 prediction-market arbitrage checks doesn't - only shown when the pairing reason fits the companion.

More finance MCP servers · Yolfi Payments MCP · Tablecloth MCP · Stock Scanner MCP · D365fo Connector · Quant Context

More Python MCP servers · Fivetran MCP · Plaxis · Word MCP Live · Plctap · Markitai · see all