polygon-news-mcp

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Read-only Model Context Protocol (MCP) server that wraps the Polygon.io public API as 8 tools (6 business + 2 meta) for use inside Cursor, Claude Code, and any MCP-aware agent.

Read-only — every tool issues plain HTTPS GETs against https://api.polygon.io/. Nothing is ever written back to Polygon.

Why a separate repo

polygon-news-mcp is sister to schwab-marketdata-mcp and sec-edgar-mcp. It fills the gap that Schwab's market-data feed leaves open: news, ticker reference metadata, and an SEC filings index with sentiment.

| Capability | Schwab MD | SEC EDGAR | Polygon (here) | | --------------------------- | --------- | --------- | ------------------ | | Quotes, candles, options | yes | no | no | | Filings (10-K / 10-Q / 8-K) | no | yes | index only | | News + sentiment | no | no | yes | | Ticker reference metadata | partial | partial | yes | | Dividends | partial | no | yes | | Earnings calendar | partial | 8-K 2.02 | deferred to v0.3 |

All three repos share the same hardening discipline:

• DuckDB-backed local cache (1 h news / 24 h ticker details / 6 h filings).
• httpx async client with token-bucket rate limit (free tier: 5 req/min).
• Pydantic v2 input validation (anchored ticker regex).
• Stdio hardening so log lines never corrupt the JSON-RPC stream.
• Structured error hierarchy (PolygonAuthError, PolygonNotFoundError, PolygonRateLimitError, PolygonValidationError, PolygonTransientError).

Cost & authentication

• Cost: free tier ($0) supports 5 req/min — usable for interactive research but rate-limited. Paid tiers start at $29/mo (Starter, 5x rate) and $79/mo (Developer).
• Auth: Polygon requires an API key on every request. Get one for free at https://polygon.io/dashboard/api-keys and put it in .env as POLYGON_API_KEY=....

The key is sent via the Authorization: Bearer ... header; it is never embedded in the request URL, so nothing the server logs can echo it.

Quick start

git clone https://github.com/kevinkda/polygon-news-mcp.git
cd polygon-news-mcp

uv sync --extra dev
uv run pre-commit install

cp .env.example .env
# edit .env — set POLYGON_API_KEY=<your-key>

uv run polygon-news-mcp        # start the MCP server on stdio

Register the server with Cursor / Claude Desktop — see docs/REGISTER.md.

Tooling surface

The server exposes 8 tools: 6 business + 2 meta.

get_earnings_calendar is deferred to v0.3 pending Polygon paid-tier validation. Polygon's free-tier REST surface does not include a dedicated earnings-calendar endpoint (only /vX/reference/financials for filed financial statements). Until paid-tier access is wired up, use sec-edgar-mcp.get_8k_with_items(item_codes=["2.02"]) to detect earnings 8-K filings as a fallback — see docs/REGISTER.md.

get_ticker_news

• When to use: to pull the most recent news articles mentioning a single ticker — the "what is being said about $TICKER" query.

• Input: ticker: str (e.g. "AAPL"), limit: int = 10 (1-1000), since_days: int = 7 (1-365).

• Returns: { ticker, count, articles: [{ id, publisher, title, author, published_utc, article_url, tickers, description, keywords, insights: [{ ticker, sentiment, sentiment_reasoning }, ...] }, ...] }.

• Example call:

  get_ticker_news(ticker="AAPL", limit=20, since_days=14)
  

get_market_news

• When to use: to pull the most recent market-wide news (no ticker filter) — the "what's moving the tape today" query.

• Input: limit: int = 20 (1-1000), since_hours: int = 24 (1-720).

• Returns: same shape as get_ticker_news with ticker = null.

• Example call:

  get_market_news(limit=50, since_hours=12)
  

get_ticker_details

• When to use: to fetch Polygon's reference metadata for a ticker — name, exchange, SIC code, address, branding logos, market cap, etc. Pair with Schwab Market Data's quote endpoint for a complete picture.

• Input: ticker: str.

• Returns: { ticker, name, market, locale, primary_exchange, type, active, currency_name, cik, market_cap, address, description, sic_code, homepage_url, total_employees, list_date, branding: { logo_url, icon_url } }.

• Example call:

  get_ticker_details(ticker="MSFT")
  

list_sec_filings_index

• When to use: to list a ticker's SEC filings with Polygon's value-add annotations — sentiment and category — that the raw SEC EDGAR feed does not carry. Pair with sec-edgar-mcp.get_filing_text to drill into the body of any filing.

• Input: ticker: str, since_days: int = 90 (1-365).

• Returns: { ticker, since_days, count, filings: [{ accession_number, form_type, filed_date, period_of_report, company_name, ticker, cik, sentiment, category, filing_url, primary_document_url }, ...] }.

• Example call:

  list_sec_filings_index(ticker="AAPL", since_days=180)
  

get_news_sentiment_aggregate

• When to use: to roll up Polygon's per-article insights[].sentiment annotations into a single per-ticker summary over a fixed look-back window — the "what's the news mood on $TICKER this week / this month" query. Drives the shakeout-with-news playbook (combine with Schwab's price action + a news sentiment reading to confirm or reject a shakeout).

• Input: ticker: str, window_days: 1 | 7 | 30 = 7.

• Returns: { ticker, window_days, total_articles, sentiment_distribution: { positive, neutral, negative }, sentiment_score (-1.0 to +1.0), top_publishers: [{ publisher, count }], most_significant_articles: [{ title, published_utc, sentiment, publisher, article_url }] }.

• Example call:

  get_news_sentiment_aggregate(ticker="MSFT", window_days=30)
  

  This does not issue a new Polygon request when the underlying get_ticker_news cache is warm — the aggregation is in-process.

get_dividends

• When to use: to fetch a ticker's dividend history with full declaration / record / ex-dividend / pay dates and the cash amount. Drives the dividend-tracker playbook — pair with Schwab Market Data for the price action around each ex-date.

• Input: ticker: str, since_days: int = 365 (1-3650), dividend_type: "all" | "regular" | "special" | "unspecified" = "all".

• Returns: { ticker, since_days, count, dividends: [{ ticker, ex_dividend_date, pay_date, declaration_date, record_date, cash_amount, currency, frequency, dividend_type }, ...] }. dividend_type is normalised to "regular" (Polygon CD), "special" (Polygon SC), or "unspecified".

• Example call:

  get_dividends(ticker="AAPL", since_days=730, dividend_type="regular")
  

health_check (meta)

Local probe: returns server version, cache state, rate-limit budget, API key status. Never calls Polygon.

get_server_info (meta)

Local metadata: server version, supported tools, MCP SDK version, OS hint. Never calls Polygon.

Cache TTLs

| Table | TTL | Rationale | | ---------------------- | ---- | -------------------------------------------------- | | news_cache | 1 h | News feeds churn fast. | | ticker_details_cache | 24 h | Reference data is stable. | | filings_index_cache | 6 h | Filings are filed throughout each business day. | | dividends_cache | 24 h | Dividend declarations are slow-cadence. |

Override with POLYGON_CACHE_BYPASS=1 for a single-call force-fresh.

Documentation

• docs/REGISTER.md — Cursor / Claude Desktop registration steps.
• docs/THREAT_MODEL.md — STRIDE analysis.
• docs/RELEASE.md — release / version process.
• CONTRIBUTING.md — contributor workflow.

License

MIT — see LICENSE.

Responsible use

Polygon.io's data is licensed for the operator's use under their plan terms. This server is intended for interactive single-user research; do not embed it in a service that fan-outs more than your plan's published rate limit. The free-tier ceiling is 5 req/min and the bundled token bucket defaults to that — raise POLYGON_RATE_LIMIT_PER_MIN only if your plan permits.