Veynor MCP Server
Prediction market intelligence for AI agents, enabling real-time access to whale trades, market data, signals, and AI-synthesized analysis from Kalshi and Polymarket via a standardized protocol.
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veynor-xyz
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The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
get_whale_feedReturns recent large trades (≥$8,000 notional) across Polymarket and Kalshi. WHEN TO USE: User asks about "smart money", "whale activity", "large trades", "who's buying", "what are big traders doing", or wants to track directional conviction in any market. WHEN NOT TO USE: For market prices or disc…
get_top_marketsReturns the top 20 most actively traded prediction markets, ranked by 24-hour volume. Covers both Kalshi and Polymarket. Each market includes title, YES price, 24h volume, category, and direct trading URL. WHEN TO USE: User asks "what's hot right now", "most active markets", "biggest markets today"…
get_marketFetches full details for one specific prediction market by ID. Returns prices, volume, open interest, order book summary, and resolution rules. WHEN TO USE: You already have a specific market ID and want full details — price, liquidity, resolution criteria. Also use this before placing a trade to c…
get_alpha_signalsReturns three categories of alpha signals across Kalshi and Polymarket. Signal types: - wide_spreads: markets with unusually wide bid/ask (illiquid books — entry opportunity if you have a view) - price_movers: markets with the largest YES price moves in the last 24h (momentum or reversal setups) - …
search_marketsSearches prediction markets by keyword across Polymarket and Kalshi. Returns matching markets with current YES prices, 24h volume, and direct trading URLs. WHEN TO USE: User wants markets about a specific topic, person, event, or keyword. Any time the user names something specific — a country, pers…
get_usageReturns current credit balance, tier, quota, and per-tool credit costs. Always free (0 credits). WHEN TO USE: User asks "how many credits do I have", "what's my balance", "am I on free tier", "how much does X cost", or before running an expensive query to check headroom. Also useful at the start of…
get_price_historyReturns the rolling ~1-hour price history for one specific market (60-second snapshots). Includes pre-computed 5m, 15m, and 1h price moves. WHEN TO USE: User wants to see recent price trend, momentum, or whether a market is moving. Use after get_market or search_markets to drill into a specific mar…
place_kalshi_orderPlaces a limit or market order on Kalshi using the user's registered API credentials. WHEN TO USE: User explicitly asks to buy or sell a Kalshi market. Requires the user to have registered their Kalshi credentials first via POST /v1/credentials/kalshi. WHEN NOT TO USE: For Polymarket orders — use s…
submit_signed_orderRelays a pre-signed Polymarket order to the CLOB. No-custody: Veynor never holds private keys. The order must be signed client-side (EIP-712) before calling this tool. WHEN TO USE: User has already signed a Polymarket order and wants to submit it. This is step 3 of the Polymarket trading flow: get_…
get_market_pulseReturns a full AI-synthesized prediction market briefing. Covers top volume markets, whale activity, price movers, volume spikes, and wide spreads — all in one call. The 'summary' field is a ready-to-read paragraph written by Claude Haiku. Cost: 5 credits. WHEN TO USE: User wants a morning briefing…
query_intelligenceRuns a natural-language query through the Veynor intelligence engine. Finds relevant prediction markets across Kalshi and Polymarket, then returns an AI-synthesized analysis calibrated to the query intent. Cost: 5 credits. Intent routing (automatic): - Topic/search queries (e.g. "what are markets s…
get_topic_marketsReturns active markets for a curated topic tag, with an AI-synthesized summary of what the collective market is pricing in. Cross-venue: always includes both Kalshi and Polymarket. Cost: 3 credits. WHEN TO USE: User asks about a broad topic area — "geopolitics", "crypto markets", "Trump markets", "…
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
Nodemailer: Message-level raw option bypasses disableFileAccess/disableUrlAccess, enabling arbitrary file read and full-response SSRF in the delivered message
Nodemailer’s addressparser is vulnerable to DoS caused by recursive calls
ANTHROPIC_API_KEYsk-ant-... # Required for AI synthesis toolsCREDENTIAL_ENCRYPTION_KEYDB_PATHKALSHI_API_KEY_IDKALSHI_PRIVATE_KEYKALSHI_PRIVATE_KEY_PATHMCP_ADMIN_SECRETyour-secret-hereMCP_PORTPOLY_BUILDER_API_KEYPOLY_BUILDER_PASSPHRASEPOLY_BUILDER_SECRETSTRIPE_ADVANCED_PRICE_IDSTRIPE_PRO_PRICE_IDSTRIPE_SECRET_KEYSTRIPE_WEBHOOK_SECRETVEYNOR_API_URLThe server runs on port 3001 by default. The Next.js app must be running at — the MCP server reads data files from disk and calls the intelligence endpoint via localhost HTTP.WIDE_SPREADS_PATHTool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
24/24 tools missing one or more hints — get_whale_feed (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_top_markets (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_market (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +21 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
License file
No license file
Add a LICENSE file (MIT, Apache-2.0, etc.).
Tests exist
No test files found
Add tests that exercise each declared tool.
Shell command execution
1 child_process call — runs shell commands
Prefer library functions over shell-outs. If you must shell out, ensure all inputs are properly escaped.
Secrets not logged
3 secret values sent to console.log
Redact or omit secret values from log output.
Production dependencies are patched
0 critical, 5 high severity in production deps — @modelcontextprotocol/sdk@1.10.2 (high), @modelcontextprotocol/sdk@1.10.2 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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