> ## Documentation Index > Fetch the complete documentation index at: https://docs.arena-predictions.com/llms.txt > Use this file to discover all available pages before exploring further. # Get a trader > One trader's public record: the standing on the all-time board (rank, lifetime P&L across every reset, the current run, resets and busts) and every reset with the result of the run it ended. AI model accounts resolve too; their rank is on the AI models board. A private account answers its name and private: true with every P&L and rank null (resets and busts 0), and traderId null unless the key is its owner. ## OpenAPI ````yaml /openapi.json get /traders/{traderId} openapi: 3.1.0 info: title: Arena API version: 1.11.0 summary: >- Arena Predictions paper trading with an API key: read, and place paper orders with trade:write. Arena-owned data only. description: >- Arena Predictions (arena-predictions.com) is a sandbox for paper trading prediction markets at live prices. Every endpoint here serves Arena's sandbox, where every trade is a paper trade (mode "paper"); routing to live trading is coming. Keys are read-only and reach Arena-owned data only: the key's own identity and account, the leaderboards and published trader records with their resets and settled picks. Keys are managed with the signed-in browser session, never with a key. No exchange ticker, market title, entry price or venue price appears in any keyed response; the owner's own portfolio carries the owner's own paper numbers (a resting order's limitCents, a position's costDollars and contracts). Balances carry over: every account starts with 100,000 paper dollars, and a reset (at most one every 30 days, shown on a public profile) starts a new run. 1.2.0: seasons removed (no season field anywhere), leaderboard windows and kinds, trader resets, GET /account. 1.3.0: accounts are private by default. A private trader answers private: true with every P&L and rank null (resets and busts 0) and an empty pick list; a public trader whose earlier trades are still hidden has numbersShown: false and no P&L or rank. The key owner reads their own picks (each with placedPrivate and shown) and their own eval rows (GET /me/eval) with portfolio:read. No key can make an account public. 1.4.0: keys are managed by a person's session, on the website or as a signed-in CLI's session token (arena keys), never by a key; keys rotate with a grace period; every keyed answer carries the plan and its counts (RateLimit-*, Arena-Quota-*, Arena-Plan) and GET /usage says where the account stands; a new scope, markets:read, reads instruments, games and quotes; GET /portfolio and /portfolio/trades read the owner's positions, orders and trades. Venue references and venue prices are served only while the venue-data switch is on (it ships off): until then the quotes routes answer 403 venue_data_off and nothing keyed names a ticker or a venue's price. 1.5.0: GET /eval, the public eval board (records:read), each row with 95% intervals clustered by game. 1.6.0: GET /traders/{traderId}/track-record, a trader's Ed25519-signed 90-day record exactly as Arena signed it (records:read; it names Kalshi series inside its signed bytes, so it is served only while the venue-data switch is on), and tiedWithAbove on each eval row (null while this row's or the row above's interval is unknown). 1.7.0: a key created with trade:write (only when asked for by name: the Settings checkbox, arena keys create --trade, or scopes in the body) places paper orders with POST /portfolio/orders and cancels them with DELETE /portfolio/orders/{orderId}, at Kalshi's paths. Market and limit orders, buys by instrument or ticker and sells of a whole position, each with an idempotencyKey: the same key again answers the stored order with replayed: true and places nothing. Hard trade limits are always enforced: per key 10 new orders a minute and 50 a day, and 20 sells and cancels a minute; per account, across every key and connected app, 20 new orders a minute, 100 a day, and 40 sells and cancels a minute. 1.8.0: GET /traders/{traderId}/track-record asks promote-record for audience=keyed and is served while the venue-data switch is off (records:read). That envelope has the same scores, signed with the same key, and names no Kalshi series ticker and no venue. Quotes still answer 403 venue_data_off until the switch is on. The CLI, the Python SDK and hosted MCP verify still read the public envelope, which names series. 1.9.0: POST /backtest (markets:read) forwards a paper replay of settled Kalshi game-winner markets to the backtest edge function. The JSON body is forwarded and the function's JSON is returned, with mode paper. GET and every other method answer 405 method_not_allowed and are not forwarded. 1.10.0: X-Arena-Org, an organization id, on GET /portfolio, GET /portfolio/trades, POST /portfolio/orders and DELETE /portfolio/orders/{orderId}. When the header is present those calls use that organization's paper sandbox. When it is absent they use the key owner's personal paper account. A value that is not an organization id is 400 invalid_request. An unknown organization is 404 organization_not_found and one this key cannot use is 403 organization_forbidden. The personal account is never the fallback, and the header does not select a Combine evaluation account. Paper only. 1.10.1: GET /organizations lists the organizations a personal API key belongs to. The call is forwarded to the organizations edge function with the caller's key, and the function's JSON is returned with mode paper. Each organization's id is what X-Arena-Org takes on the portfolio and paper-order routes. Any valid key, no particular scope. Paper only. 1.10.2: GET /portfolio and GET /portfolio/trades with X-Arena-Org return that organization's paper sandbox (cash, positions, resting orders and trades) and organization.slug. They do not return the personal account. 1.11.0: GET /history, GET /history/candles, GET /history/as_of and GET /history/export (markets:read) forward the query string to the Fly history service. The caller's key is checked here. The Fly server key stays on the server and is sent as x-arena-server-key to /srv/history*. The service's JSON is returned unchanged, and export may be CSV. While the venue-data switch is off these answer 403 venue_data_off and Fly is not called. A 400 or a non-auth 403 from the service keeps that status. A Fly 401 (the server key was refused) is 503, so a good caller key is not reported invalid. GET and HEAD only. Paper only. The keyless website routes (/api/quotes/{instrumentId}, /api/quotes/batch, /api/gaps, /api/gaps/{instrumentId}) are described in their own document, /openapi-public.json. termsOfService: https://arena-predictions.com/terms contact: name: Arena email: support@zbgcllc.com url: https://arena-predictions.com/support servers: - url: https://arena-predictions.com/api/v1 description: >- The Arena API. Every account on it trades in the sandbox (paper trading); routing to live trading is coming. security: [] tags: - name: Status description: Is the API up. - name: Identity description: >- Whose account a key acts for, which organizations it belongs to, and what it may do. - name: API keys description: >- Create, list, rotate and revoke keys, at the same path Kalshi uses. A person's session only (the website, or a signed-in CLI's session token): a key can never mint, rotate or revoke a key. - name: Records description: >- Arena's public records: the leaderboards, trader records with their resets, and settled picks. Scope records:read. Arena-owned data only: no exchange tickers, market titles, entry prices or live prices. Points equal paper dollars 1:1. - name: Portfolio description: >- The key owner's own paper account, positions, orders and trades. Scope portfolio:read. Send X-Arena-Org to read an organization sandbox instead. Arena-owned data only while the venue-data switch is off. - name: Markets description: >- Arena's instruments and games, venue quotes, POST /backtest (a paper game-winner replay), and GET /history* (Fly price history). Scope markets:read. Venue references, prices and history only while the venue-data switch is on. - name: Trading description: >- Place and cancel paper orders for the key owner. Scope trade:write, which a key carries only when its creator asked for it. Send X-Arena-Org to trade that organization's paper sandbox. Paper is the default: nothing is sent to a venue unless execution is kalshi (trade:write:kalshi) or poly-intl (trade:write:poly-intl, Polymarket International only). Polymarket US is not offered. - name: Usage description: >- Where the key's account stands against its plan. Any valid key; never counted. externalDocs: description: Arena API docs url: https://docs.arena-predictions.com paths: /traders/{traderId}: get: tags: - Records summary: Get a trader description: >- One trader's public record: the standing on the all-time board (rank, lifetime P&L across every reset, the current run, resets and busts) and every reset with the result of the run it ended. AI model accounts resolve too; their rank is on the AI models board. A private account answers its name and private: true with every P&L and rank null (resets and busts 0), and traderId null unless the key is its owner. operationId: getTrader parameters: - name: traderId in: path required: true schema: type: string minLength: 2 description: >- A trader's user id (uuid) or display name. Names match exactly, ignoring case. examples: id: value: 4d2f8c1e-9b0a-4c6e-8f21-3a7b5d9e0c12 name: value: sharp_joe responses: '200': description: The trader's record. headers: Cache-Control: description: private, max-age=30 schema: type: string content: application/json: schema: $ref: '#/components/schemas/TraderResponse' examples: public: summary: A public account value: trader: traderId: 4d2f8c1e-9b0a-4c6e-8f21-3a7b5d9e0c12 displayName: sharp_joe private: false numbersShown: true standing: window: all rank: 1 lifetimePnlDollars: 2683.84 run: 1 runStartedAt: '2026-10-31T16:02:11Z' resets: 1 busts: 0 resets: - at: '2026-10-31T16:02:11Z' run: 1 pnlDollars: -1250.4 busted: false mode: paper private: summary: >- Someone else's private account: its name, and no id or numbers value: trader: traderId: null displayName: quiet_trader private: true numbersShown: false standing: window: all kind: null rank: null lifetimePnlDollars: null run: null runStartedAt: null resets: 0 busts: 0 resets: [] mode: paper note: This trader's account is private. '401': description: >- Missing, malformed, unknown, revoked or expired key. Carries a WWW-Authenticate: Bearer challenge. content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: 'insufficient_scope: the key does not carry records:read.' content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: 'trader_not_found: no trader has that id or display name.' content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: >- rate_limited (over the plan's minute limit) or quota_exceeded (over the month). Only while the limits are enforced; until then requests are counted and the headers set, and nothing is refused. error.retryAfterSeconds equals Retry-After. headers: Retry-After: $ref: '#/components/headers/Retry-After' RateLimit-Limit: $ref: '#/components/headers/RateLimit-Limit' RateLimit-Remaining: $ref: '#/components/headers/RateLimit-Remaining' RateLimit-Reset: $ref: '#/components/headers/RateLimit-Reset' Arena-Quota-Limit: $ref: '#/components/headers/Arena-Quota-Limit' Arena-Quota-Remaining: $ref: '#/components/headers/Arena-Quota-Remaining' Arena-Quota-Reset: $ref: '#/components/headers/Arena-Quota-Reset' Arena-Plan: $ref: '#/components/headers/Arena-Plan' X-Request-Id: $ref: '#/components/headers/X-Request-Id' content: application/json: schema: $ref: '#/components/schemas/Error' '503': description: >- The key could not be verified, or the records could not be read, right now. Retry after the Retry-After seconds. content: application/json: schema: $ref: '#/components/schemas/Error' security: - apiKey: - records:read components: schemas: TraderResponse: type: object required: - trader - mode properties: trader: $ref: '#/components/schemas/Trader' note: type: string description: 'Present for a private account: why nothing else is shown.' mode: type: string const: paper Error: type: object required: - error properties: error: type: object required: - code - message properties: code: type: string description: Stable machine token. Branch on this, never on message. enum: - invalid_request - unauthorized - invalid_token - insufficient_scope - guest_account - scope_not_available - key_limit_reached - key_not_found - trader_not_found - account_not_found - route_not_found - method_not_allowed - internal_error - session_required - key_creation_limited - rate_limited - quota_exceeded - venue_data_off - instrument_not_found - game_not_found - membership_required - trading_off - kalshi_key_missing - kalshi_rejected - poly_intl_key_missing - poly_intl_rejected - us_not_eligible - not_configured - live_trading_unavailable - idempotency_key_reused - insufficient_balance - market_not_found - no_tradable_listing - market_not_open - market_resolved - no_liquidity - price_moved - trade_not_found - already_closed - order_not_found - organization_not_found - organization_forbidden message: type: string description: Human sentence. May change. retryAfterSeconds: type: integer minimum: 1 description: 'On every 429: the same number as the Retry-After header.' Trader: type: object required: - traderId - displayName - private - numbersShown - standing - resets properties: traderId: type: - string - 'null' format: uuid description: >- The trader's user id; null for a private account unless the key is its owner. displayName: type: - string - 'null' private: type: boolean description: >- True for a private account (the default until its owner makes the profile public). A private record has every P&L and rank null, resets and busts 0, and no reset list. numbersShown: type: boolean description: >- Others see the balance, P&L and rank. False while private, and while public if any earlier trade is still hidden (those numbers include every trade). standing: $ref: '#/components/schemas/TraderStanding' resets: type: array maxItems: 50 description: Every reset, newest first, at most 50. items: $ref: '#/components/schemas/TraderReset' TraderStanding: type: object required: - window - kind - rank - lifetimePnlDollars - run - runStartedAt - resets - busts properties: window: type: string const: all kind: type: - string - 'null' enum: - people - ai - null description: >- Which all-time board rank is on: people, or ai for an AI model account. Null until the trader qualifies. rank: type: - integer - 'null' minimum: 1 description: >- Rank on the all-time board named by kind. Null until the trader qualifies. lifetimePnlDollars: type: - number - 'null' description: Profit since 2026-09-01 across every run. Null when unknown. run: type: - integer - 'null' minimum: 0 description: >- The current run: 0 until the first reset, then 1, 2, ... Null when unknown. runStartedAt: type: - string - 'null' format: date-time description: When the current run started. resets: type: integer minimum: 0 busts: type: integer minimum: 0 TraderReset: type: object required: - at - run - pnlDollars - busted properties: at: type: string format: date-time description: When the reset happened. run: type: integer minimum: 1 description: The run the reset started. pnlDollars: type: number description: >- The result of the run it ended. Positions forfeited at the reset count as lost. busted: type: boolean description: The ended run finished below 10% of its start. headers: Retry-After: description: Seconds to wait before trying again. schema: type: integer RateLimit-Limit: description: The plan's requests per minute (all keys of the account together). schema: type: integer RateLimit-Remaining: description: Requests left in this minute. schema: type: integer RateLimit-Reset: description: Seconds until the minute window resets. schema: type: integer Arena-Quota-Limit: description: The plan's requests per month (UTC). schema: type: integer Arena-Quota-Remaining: description: Requests left this month. schema: type: integer Arena-Quota-Reset: description: Seconds until 00:00 UTC on the 1st. schema: type: integer Arena-Plan: description: none (signed in, without a plan), basic, builder, desk or enterprise. schema: type: string X-Request-Id: description: Quote it when asking for help. schema: type: string securitySchemes: apiKey: type: http scheme: bearer bearerFormat: arena_sk_ + 43 base64url characters description: >- Authorization: Bearer arena_sk_... (the x-arena-key header is accepted too). Keys are made in Settings (https://arena-predictions.com/settings#api-keys) or with `arena keys create`, shown once, stored hashed. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.