# Polymarket Us (npm · @pipeworx/mcp-polymarket-us)

Polymarket US MCP — market data for Polymarket US (polymarket.us), the CFTC-regulated, US-licensed…

- Trust score: 80/100 (high trust)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `gateway.pipeworx.io`: 77/100, [markdown](https://verifymcp.io/servers/pipeworx-io-polymarket-us/polymarket-us-mcp.md), [page](https://verifymcp.io/servers/pipeworx-io-polymarket-us/polymarket-us-mcp)
- npm · `@pipeworx/mcp-polymarket-us`: 80/100 (this document), [markdown](https://verifymcp.io/servers/pipeworx-io-polymarket-us/pipeworx-mcp-polymarket-us.md), [page](https://verifymcp.io/servers/pipeworx-io-polymarket-us/pipeworx-mcp-polymarket-us)

## Channel facts

- Registry: `npm`
- Package: `@pipeworx/mcp-polymarket-us`
- Version: `0.2.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to pipeworx-io/mcp-polymarket-us).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 0 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 67/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1078 tokens (~215/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Polymarket Us MCP server?

Polymarket Us runs locally as an npm package, launched with npx -y @pipeworx/mcp-polymarket-us. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add pipeworx-io-polymarket-us -- npx -y @pipeworx/mcp-polymarket-us
```

### Cursor

```json
{
  "mcpServers": {
    "pipeworx-io-polymarket-us": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-polymarket-us"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "pipeworx-io-polymarket-us": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-polymarket-us"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add pipeworx-io-polymarket-us -- npx -y @pipeworx/mcp-polymarket-us
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "pipeworx-io-polymarket-us": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@pipeworx/mcp-polymarket-us"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add pipeworx-io-polymarket-us --command npx --arg -y --arg @pipeworx/mcp-polymarket-us
```

### Hermes

```yaml
mcp_servers:
  pipeworx-io-polymarket-us:
    command: "npx"
    args: ["-y", "@pipeworx/mcp-polymarket-us"]
```

### Netclaw

```json
{
  "McpServers": {
    "pipeworx-io-polymarket-us": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@pipeworx/mcp-polymarket-us"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add pipeworx-io-polymarket-us -t stdio -c npx -a -y @pipeworx/mcp-polymarket-us
```

### Other

```json
{
  "mcpServers": {
    "pipeworx-io-polymarket-us": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-polymarket-us"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 0 to 3. That category is still filling its 30-day observation window: 0 days of observed history at the previous scan, 1 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-04 (score 79)

First indexed and scored.

## MCP tools (5)

### `polymarket_us_search` (~340 tokens)

Market search/discovery on Polymarket US (polymarket.us) — the SEPARATE, CFTC-regulated, US-licensed venue, distinct from the offshore `polymarket` pack and from `kalshi`. Pass `query` for a keyword search across the full market corpus (returns matching events, each with its child markets and live prices). Omit `query` to BROWSE instead — the highest-volume open markets right now, optionally filtered by `category` (e.g. "macro", "sports", "politics"). Use for "what does Polymarket US have on X", "biggest markets trading right now on the regulated US venue", or as a first step before polymarket_us_bbo / polymarket_us_book / polymarket_us_price_history / polymarket_us_settlement, all of which need a market `slug` this tool returns. Every market price is YES-side implied probability in [0,1].

Input parameters:

- `category` (string): Browse-only filter, e.g. "macro", "sports", "politics", "crypto". Ignored when `query` is set (Polymarket US search has no category filter).
- `limit` (number): 1–50 results (default 10)
- `query` (string): Keyword search, e.g. "fed rate", "election", "nfl". Omit to browse the highest-volume open markets instead.
- `status` (string): open | closed (default open). With a query, filters the search; without one, "open" means active & not closed, "closed" means closed.

### `polymarket_us_bbo` (~140 tokens)

Best bid/offer (lightweight top-of-book) for one Polymarket US market by slug — current price, last trade price, best bid, best ask, bid/ask depth (number of price levels), open interest, shares traded, and market state. Use before quoting a price when you need just the top of book, not the full depth ladder (for that, see polymarket_us_book). Get a slug from polymarket_us_search.

Input parameters:

- `slug` (string, required): Polymarket US market slug (e.g. "aec-nfl-lac-ten-2025-11-02"), from polymarket_us_search.

### `polymarket_us_book` (~113 tokens)

Full order book (bid/ask depth ladder with size at every visible price level) plus session stats — open/high/low/last-trade price, shares traded, notional traded, open interest — for one Polymarket US market by slug. Use to check actual tradable depth before sizing a trade; polymarket_us_bbo gives only the top of book. Get a slug from polymarket_us_search.

Input parameters:

- `slug` (string, required): Polymarket US market slug, from polymarket_us_search.

### `polymarket_us_price_history` (~219 tokens)

Historical Yes/No display-price time series for one Polymarket US market by slug. `interval` picks a fixed lookback window (1h | 6h | 1d | 1w | 1m | all); `fidelity` is the spacing between points in minutes (default 60). Returns an array of {timestamp, yes_price, no_price} — these are DISPLAY prices (yes normally derived from the best ask, no from one minus the best bid) and preserve the bid/ask spread, so yes_price + no_price can exceed 1.0 — that is not a data error. Get a slug from polymarket_us_search.

Input parameters:

- `fidelity` (number): Minutes between data points, minimum 1 (default 60).
- `interval` (string): 1h | 6h | 1d | 1w | 1m | all (default 1d)
- `slug` (string, required): Polymarket US market slug, from polymarket_us_search.

### `polymarket_us_settlement` (~211 tokens)

Settlement (resolution) result for one Polymarket US market by slug — the final settlement price, which is 1 for the winning side / 0 for the losing side on a binary market (and can be a fractional value for a 50/50 or partial settlement). Three distinguishable outcomes: a settled market returns `settled: true` with the price; an open market that exists but has not resolved returns `settled: false` with no price and a "still open" message; a slug that does not exist on Polymarket US returns `error: "not_found"` with `settled: null` — it is NEVER reported as "still open". Use after polymarket_us_search / a known slug to check how a market actually resolved. NOTE: this tool returns a price only, no settlement timestamp — Polymarket US does not publish one on this endpoint.

Input parameters:

- `slug` (string, required): Polymarket US market slug, from polymarket_us_search.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/pipeworx-io-polymarket-us/pipeworx-mcp-polymarket-us#diagnostics

## Score history

- 2026-11-05: 80
- 2026-11-04: 79

## Common questions

### What is the Polymarket Us MCP server?

Polymarket Us is an MCP server listed in the public MCP registry as io.github.pipeworx-io/polymarket-us. Polymarket US MCP, market data for Polymarket US (polymarket.us), the CFTC-regulated, US-licensed… This page covers its npm package (@pipeworx/mcp-polymarket-us).

### Is the Polymarket Us MCP server safe to use?

Polymarket Us scores 80 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Polymarket Us MCP server expose?

Polymarket Us exposes 5 tools: polymarket_us_search, polymarket_us_bbo, polymarket_us_book, polymarket_us_price_history, polymarket_us_settlement. Their descriptions and schemas cost roughly 1,023 tokens of context every time the server is loaded.

### Is the Polymarket Us MCP server still maintained?

Polymarket Us is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Polymarket Us MCP server under?

Polymarket Us declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@pipeworx/mcp-polymarket-us
- Socket report: https://socket.dev/npm/package/@pipeworx/mcp-polymarket-us
- Repository: https://github.com/pipeworx-io/mcp-polymarket-us
- Website: https://pipeworx.io/packs/polymarket-us
- Changelog RSS feed: https://verifymcp.io/servers/pipeworx-io-polymarket-us/pipeworx-mcp-polymarket-us.xml
- Changelog JSON feed: https://verifymcp.io/servers/pipeworx-io-polymarket-us/pipeworx-mcp-polymarket-us.json
- HTML version of this page: https://verifymcp.io/servers/pipeworx-io-polymarket-us/pipeworx-mcp-polymarket-us