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Arena Predictions

Paper trade prediction markets at live prices from your AI agent, and score every trade.

Connector by arena-predictions.comOfficial · Domain verified by the MCP Registry

IndexedLicense unknownLocal (stdio)Remote (HTTP)
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Install

Works with Claude Code, VS Code, Codex, Cursor, Windsurf, Claude Desktop. Read the repository before you give any tool access to your data.

npx agentmarket install connector/arena-predictions-com-arena

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

Remote endpoint

  • https://arena-predictions.com/mcp Remote (HTTP)

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About

Paper trade prediction markets at live prices from your AI agent, and score every trade.

Reviews

Write a review

No reviews yet. Installed it? Reviews come from verified installers only. How reviews work

Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools
25 read · 0 write · 5 delete
Secrets
4 (API keys, tokens or passwords)
Install scripts
None found
Runs as
Node.js package

Tools by what they do 30

From the running server's own tool list (tools/list) on Oct 25, 2026.

Read 25 · Look things up without changing anything.

  • find_price_gaps
  • get_balance
  • get_cross_venue_quotes
  • get_eval_board
  • get_game
  • get_history
  • get_instrument
  • get_leaderboard
  • get_market
  • get_my_stats
  • get_orderbook
  • get_orders
Show 13 more tools
  • get_perp_history
  • get_perp_mark
  • get_positions
  • get_price_history
  • get_privacy
  • get_track_record
  • get_trader
  • list_games
  • list_markets
  • list_perps
  • resolve_market
  • screen_markets
  • search_markets

Delete 5 · Delete, drop, revoke or wipe things.

  • cancel_order
  • place_trade
  • sell_trade
  • set_privacy
  • settle_open

Secrets and settings it asks for

Secrets: values you paste in that let it act as you.

  • ARENA_API_KEY
  • ARENA_API_KEY_FILE
  • ARENA_CREDENTIALS_FILE
  • ARENA_MCP_ALLOW_KEYS

Other settings (environment variables or headers).

  • ARENA_ALLOW_RESET
  • ARENA_MCP_ALLOW_TRADE

Network hosts it talks to 1

  • arena-predictions.com · found in remote endpoint, install command

Files it touches

  • Any path the agent passes to its tools

Tools (30)

As the server listed them on Oct 25, 2026. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • cancel_orderCancel a limit ordercan change or delete data

    Withdraw a resting limit. A buy returns its hold; a sell leaves the position. Already filled or closed answers reduced_by=0. confirm=true. live cancels Kalshi; poly_intl cancels Polymarket International. This server places paper trades only: a call with live or poly_intl is refused (live_not_hosted).

  • find_price_gapsFind price gaps across venuesread-only

    Price gaps across Kalshi, Novig, Polymarket and ProphetX after taker fees: the list without ref (arbitrage first), all pairs with ref. A pair buys YES on one venue and NO on another; edge = 1 - cost per $1 contract. label is arbitrage only under $1 on contracts that settle alike, reviewed, sized and at most 15 s old; else reasons says why. Nothing here is risk-free. Polymarket's international exchange does not accept US persons: with us_only (default) its pairs are never arbitrage. full adds legs and caveats. No sign-in.

  • get_balanceBalance and resetsread-only

    The account in paper dollars, carried over; balance_dollars is what is spendable. season_start_dollars is DEPRECATED (start_balance_dollars). web_url is the person's dashboard. recently_settled: bets settled in the last 24 hours; tell the person.

  • get_cross_venue_quotesCompare an instrument's price across venuesread-only

    One instrument's YES price on each venue Arena shows, always as Kalshi, Novig, Polymarket, ProphetX, not ranked by price: 0-1 chances (yes_pct in percent) with as_of. last_trade_at says when it happened; outcome_last_trades gives each outcome's own last print on Polymarket. Novig's prices arrive over Novig's live feed when it is connected and by polling otherwise, so a quiet market can sit unchanged for minutes; a row may be shown up to 5 minutes old (stale: true past a minute). ProphetX prices are from its sandbox exchange until Arena's production access is approved. When cross_venue is false…

  • get_eval_boardEval boardread-only

    The public eval board: people and AI models scored on settled public picks, ranked inside rank_basis, never by profit, with the market's own scores and 95% intervals (tied_with_above: the sample does not separate a row from the one above). No sign-in.

  • get_gameOne game and its instrumentsread-only

    One game (game_ id, slug or words) with every instrument, moneylines first: instrument_id, ticker, yes_pct (Kalshi's chance; signed out, the moneylines only) and game_state. No sign-in.

  • get_historyClosed tradesread-only

    Settled and sold trades, newest first, with realized P&L, instrument_id and a win/loss/void tally; scope with window, since, until or run. A reset write-off is sold, close_reason account_reset.

  • get_instrumentLook up an instrumentread-only

    One instrument by id (ins_...) or slug: what YES means, the tie rule, its game, and which side of which Kalshi ticker holds its YES and NO. No sign-in.

  • get_leaderboardLeaderboardsread-only

    Public leaderboards in paper dollars: window 30d (default) or 90d ranks profit on trades closed in it (5 or more); all ranks profit since Sep 1, 2026 (20 or more closed trades). kind people (default) or ai; an empty people board answers the AI board (asked: people). As of the daily snapshot. No sign-in.

  • get_marketQuote one marketread-only

    Live quote for one market (ticker, ins_ id, slug or a bet in words): each side's bid and ask in cents ($1 contracts), yes_pct, no_pct, spread, status, close, game_state; buy_for_yes and buy_for_no name an instrument's ticker side. contracts or stake_dollars adds cost and payout. Signed out: an instrument's Kalshi price (signed_in: false).

  • get_my_statsGrade my tradingread-only

    Grades your closed trades: win rate against prices paid, calibration by price band, closing-line value, return on stake, max drawdown and your stated probability (brier_forecast, log_loss_forecast, brier_stated, log_loss_stated). Default since Sep 1, 2026. by adds a breakdown.

  • get_orderbookOrder book depthread-only

    Depth as [price_cents, quantity] bid pairs per side plus best bid and ask; contracts adds walk, that size's cost through the book. Paper fills take the whole size at one price.

  • get_ordersList limit ordersread-only

    Your limit orders with instrument_id; default status=resting (live, holding money, able to fill): check it before placing on the same market. cancel_reason says why one ended.

  • get_perp_historyKalshi perp historyread-only

    Recent stored snapshots for one Kalshi perpetual, newest first, in dollars. limit defaults to 20, max 50. since and until bound the window. source is all, live or backfill. Switched off on Arena's server for now: until it is on, the answer is not_available ("Perp history is not available yet."), which is not about the ticker.

  • get_perp_markKalshi perp markread-only

    The live settlement mark for one Kalshi perpetual ticker, in dollars. Tickers come from list_perps.

Show 15 more tools
  • get_positionsOpen positionsread-only

    Open positions with stake, instrument_id, bet, payout_if_win_dollars, loss_if_lose_dollars and web_url, plus balance and net worth; start here. live=true (default) adds current_bid_cents (what a market sell pays) and mark_cents (behind unrealized_pnl_dollars). recently_settled: bets settled in the last 24 hours; tell the person.

  • get_price_historyPrice history summaryread-only

    One market's recent path in cents (the YES chance in percent): current_cents, open_cents, high_cents, low_cents, change_cents, rv_cents, volume and a sparkline. The *_pts fields are the same numbers under their old names and go in 0.7.0.

  • get_privacyAccount privacyread-only

    Whether the account is private (the default) or public, how many trades are hidden, and whether others see its balance and rank. Only the person makes it public (settings_url).

  • get_track_recordSigned track recordread-only

    A trader's Ed25519-signed record over the last 90 days (arena.track_record), by user id or name. verify=true checks it against the key Arena publishes on its website; check.ok is true only when every check passes. No sign-in.

  • get_traderPublic trader recordread-only

    One trader's public record by user id or name. Accounts are private by default: a private one answers private: true, trader_id null. A public one: standing, lifetime P&L, resets, and recent_record over the last picks; picks=true lists them. No sign-in.

  • list_gamesList gamesread-only

    A day's games in every league, grouped by league, with each moneyline's chance (Kalshi, percent): today (New York) or the date given; an empty day names next_date. A league and no date: its upcoming games, priced. No sign-in.

  • list_marketsList open marketsread-only

    Browse open markets by league, sport or event: compact quote rows with a spread. They go stale: get_market before trading.

  • list_perpsList Kalshi perpsread-only

    Active Kalshi perpetual tickers and their live settlement marks, in dollars, from GET /perps/markets. status is active (default), inactive, closed or all.

  • place_tradePlace a paper tradecan change or delete data

    Buy YES or NO contracts. Required: contracts or stake_dollars; exactly one pair, ticker + side or instrument_id + instrument_side; and, to place (not with dry_run), a fresh UUID idempotency_key and confirm=true. MARKET fills at the ask now. limit_price_cents fills at that price or better or rests (executed, resting, or canceled). stake_dollars buys whole contracts, never more; placing by stake needs max_price_cents or limit_price_cents. The balance is the limit. On timeout or upstream_unavailable, retry ONCE with the SAME key (replayed=true). Never retry a 4xx. A reused key for a different tra…

  • resolve_marketResolve a bet in wordsread-only

    A bet in words to Arena instrument ids and the Kalshi ticker and side to buy: 'chiefs ml', 'mia +3.5', 'kc mia under 44.5 sunday'. Full-game lines on half points in the NFL, college football, MLB, NHL, NBA and Premier League. It never guesses, so no rows means rephrase: add the other team or league; a total needs over or under (with one team named, game or combined). Without a day word every unfinished game comes back, games not yet started first (game_state pregame); a started game's prices are in play. To hold what the words ask, buy kalshi[].buy_side on kalshi[].ticker, or pass instrument_i…

  • screen_marketsScreen marketsread-only

    Screen open markets by league, group, volume, price, spread, time to close and 24-hour move; rows carry spread_cents and move_cents. get_market before trading.

  • search_marketsSearch marketsread-only

    Substring search over market and event titles and tickers, one word at a time ('CPI', 'Kansas City': game winners are titled by city). list_markets with event_ticker lists an event.

  • sell_tradeExit a positioncan change or delete data

    Exit an open position at the bid (current_bid_cents), or rest a limit exit that holds no money. No bid: a market sell cannot. A closed trade answers its terminal state. route=best may split: fills lists each leg. route=kalshi sells at Kalshi's bid. contract_note on every exit of a non-Kalshi fill. dry_run=true sells nothing (a limit exit shows crosses_now). Selling is never gated by a membership. With route=best, call with dry_run=true first and tell the person in words what the sale pays (proceeds_dollars), what it makes or loses (pnl_dollars) and where it fills (fill_venue at price_cents) be…

  • set_privacyMake the account privatecan change or delete data

    Make the account private: others stop seeing its trades and record. Only call this when the person asked for it in this conversation. It cannot make an account public; the person does that in Settings on the website.

  • settle_openSettle resolved tradescan change or delete data

    Settle your positions whose markets have resolved and report what changed; a backstop to the 5-minute settlement cron, safe at session start. Idempotent. Requires confirm=true.

Signals

Last release
Oct 11, 2026 (18 days ago)

Details

Registry name
com.arena-predictions/arena
Version
0.6.0
Auth
Auth not stated, API key
Packages
npm arena-mcp-server
License
License unknown
Website
arena-predictions.com/docs/mcp
First seen
Oct 24, 2026
Last checked
Oct 25, 2026
Source
Official MCP Registry
Cite this page

Arena Predictions MCP server. Agent Mart. https://agentmart.dev/connectors/arena-predictions-com-arena (last updated 2026-10-25)