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markets

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Updated 10-15 15:27

About this skill

Markets Orchestration

Bridges ESPN live schedules (NBA, NFL, MLB, NHL, WNBA, CFB, CBB) with Kalshi and Polymarket prediction markets. Before writing queries, consult references/api-reference.md for supported sport codes, command parameters, and price normalization formats.

Quick Start

sports-skills markets get_todays_markets --sport=nba
sports-skills markets search_entity --query="Lakers" --sport=nba
sports-skills markets compare_odds --sport=nba --event_id=401234567
sports-skills markets compare_market_url --url=https://polymarket.com/event/nfl-sf-sea-2026-10-11
sports-skills markets get_sport_markets --sport=nfl
sports-skills markets get_sport_schedule --sport=nba
sports-skills markets normalize_price --price=0.65 --source=polymarket
sports-skills markets evaluate_market --sport=nba --event_id=401234567 --fee_per_contract=<verified fee>
sports-skills markets match_markets --sport=mlb --date=2026-06-06
sports-skills markets get_market_price --venue=kalshi --ticker=KXMENWORLDCUP-26-FR
sports-skills markets get_price_history --venue=kalshi --ticker=KXMENWORLDCUP-26-FR --interval=1d

Python SDK:

from sports_skills import markets

markets.get_todays_markets(sport="nba")
markets.search_entity(query="Lakers", sport="nba")
markets.compare_odds(sport="nba", event_id="401234567")
markets.compare_market_url(url="https://kalshi.com/markets/kxnflgame/sf-vs-sea/kxnflgame-26oct11sfsea")
markets.get_sport_markets(sport="nfl")
markets.get_sport_schedule(sport="nba", date="2025-02-26")
markets.normalize_price(price=0.65, source="polymarket")
markets.evaluate_market(sport="nba", event_id="401234567", fee_per_contract=fee)  # fee: verified (user-stated or documented venue fee)
markets.match_markets(sport="mlb", date="2026-06-06")
markets.get_market_price(venue="kalshi", ticker="KXMENWORLDCUP-26-FR", at_time="2026-05-01T12:00:00+00:00")
markets.get_price_history(venue="polymarket", token_id="<token_id>", interval="1h")

CRITICAL: Before Any Query

CRITICAL: Before calling any orchestration command, verify:

  • A sport code is provided for sport-aware commands (get_todays_markets, compare_odds, get_sport_markets, evaluate_market).
  • Price sources are identified correctly before normalization: espn = American odds, polymarket = 0-1 probability, kalshi = 0-100 integer.

Important Notes

  • Sport context is passed through. --sport=nba maps automatically to the correct Polymarket sport code and Kalshi series ticker.
  • Venues differ by command. get_todays_markets, search_entity and compare_odds search Kalshi, Polymarket, ProphetX and Novig. get_sport_markets, match_markets and evaluate_market use Kalshi and Polymarket only.
  • Sport-aware search. Polymarket uses sport → series_id; Kalshi searches every series mapped for the sport (game winners, spreads, totals, futures).
  • Prices are normalized. Everything is converted to implied probability for comparison.
  • Discovery is not verification. Raw market lists (*_markets, get_sport_markets, search_entity) are search hits, not verified equivalents of a given game's contract. Only compare_odds side_prices (and evaluate_market) are identity-checked.

Workflows

Today's NBA Dashboard

sports-skills markets get_todays_markets --sport=nba

Returns each game with ESPN info, DraftKings odds, and matching Kalshi, Polymarket, ProphetX and Novig markets.

Find Arb on a Specific Game

  1. Get the ESPN event ID: get_sport_schedule --sport=nba
  2. Compare odds: compare_odds --sport=nba --event_id=<id>
  3. If arbitrage detected, response includes allocation percentages and ROI — computed from reference prices (price_basis: "reference"), so confirm both legs on each venue's order book before trading it.
  4. sources and completeness say which venues actually priced this game; a provider error is reported as error, not as "no markets".
  5. For a direct price comparison read side_prices.home / side_prices.away: each lists quotes (venue, implied_probability, price_basis: "reference", execution_guaranteed: false) admitted as this game's full-game moneyline, plus lowest_reference (null when a side has no quote; ties keep the first-listed venue). The lowest reference is not an executable quote, not fee-adjusted, and not a bet recommendation. Check warnings and completeness.complete before calling a comparison complete.
  6. Venues searched: Kalshi, Polymarket, ProphetX and Novig. Novig counts only when the event date matches and a full-game MONEY market has a two-way order book. Its price is the derived ask (1 − best opposite bid), a cached snapshot. Catalog-only markets, spreads and period markets show up in novig_markets but never price a side. search_entity and get_todays_markets also include a novig section with the same results.

Compare a Pasted Market Link

compare_market_url

  1. compare_market_url --url=<link>. Supported links: https://polymarket.com/event/<event-slug>[/<market-slug>] and https://kalshi.com/markets/<series>/<slug>/<event-ticker> (www. allowed), for single games of nfl, nba, mlb, nhl, wnba, cfb, cbb.
  2. The link is never fetched. The host must match exactly. Credentials, ports, fragments, encoded or odd path segments, and unknown query keys are refused before any call (only utm_* and other click-tracking keys are ignored).
  3. The venue API resolves exactly one open full-game two-way moneyline (Polymarket) or the two open game-winner contracts (Kalshi). Closed, non-moneyline, three-way or ambiguous sources are refused, and so is a provider answer that names another slug/ticker.
  4. ESPN scoreboards for the source date ±1 day must yield exactly one game whose teams and date validate. Doubleheaders and multiple matches are refused, and a scoreboard failure is reported as a failure, not as "no game".
  5. Returns the compare_odds payload unchanged (side_prices, sources, warnings, …) plus source_market (venue, canonical url, event/market ids, espn_event_id, in_downstream_search). When the source contract is missing from the comparison's venue search, a warning says so and no price is invented.
  6. This matches the same game's moneyline only. It does not mean the venues settle identically, and it guarantees no execution. Novig and ProphetX links are not accepted yet, though both venues still appear in the comparison.

Full Bet Evaluation

  1. evaluate_market --sport=nba --event_id=<id> --outcome=0 --fee_per_contract=<dollars per $1 contract>
  2. Verifies the market is this game's full-game winner market for the chosen side, then reads the ask off the order book
  3. Pipes ask + fee through betting.evaluate_bet: devig → edge → Kelly
  4. Returns fair probability, edge, EV, Kelly fraction, and recommendation

Without fee_per_contract the ask is reported but evaluation is null — the net numbers are refused rather than assumed free. A ticker or token_id that names another team, another date, or a derivative (first-half, spread) market is refused, not substituted. Pass the fee via the CLI (--fee_per_contract=<dollars>) or the Python wrapper. The fee must be an explicit, verified assumption: one the user stated, or the venue's officially documented fee schedule (say which). Never silently assume 0. If no fee can be verified, evaluation stays null.

Same Game on Both Venues

  1. match_markets --sport=mlb --date=2026-06-06
  2. Each match pairs the Kalshi event (with market tickers) and the Polymarket event (with moneyline token IDs) for the same game — joined deterministically on date + team codes, fuzzy title match as fallback.
  3. Feed kalshi.market_tickers[i] and polymarket.markets[i].token_ids[j] straight into get_market_price to compare prices.

Price Movement Over Time

  1. get_market_price --venue=kalshi --ticker=<ticker> --at_time=2026-05-01 for a single point-in-time price (both yes/no sides, 0-1).
  2. get_price_history --venue=kalshi --ticker=<ticker> --interval=1d for the full series — same {timestamp, price} shape on either venue.

Examples

Example 1: Today's games with prediction market odds User says: "What NBA games are on today and what are the prediction market odds?" Actions:

  1. Call get_todays_markets(sport="nba") Result: Unified dashboard with each game's ESPN info and Kalshi/Polymarket/ProphetX/Novig markets

Example 2: Cross-platform team search User says: "Find me Lakers markets on Kalshi and Polymarket" Actions:

  1. Call search_entity(query="Lakers", sport="nba") Result: Lakers search hits from Kalshi, Polymarket, ProphetX and Novig (discovery only — not verified as the same contract)

Example 3: Odds comparison for a specific game User says: "Compare the odds for this Celtics game across ESPN and Polymarket" Actions:

  1. Get event_id from get_sport_schedule(sport="nba")
  2. Call compare_odds(sport="nba", event_id="<id>") Result: side_prices per side (admitted reference quotes + lowest_reference) and an arbitrage check on reference prices

Example 4: Full market evaluation User says: "Is there edge on the Chiefs game?" Actions:

  1. Get event_id from get_sport_schedule(sport="nfl")
  2. Establish a verified fee (user-stated or the venue's documented fee), then call evaluate_market(sport="nfl", event_id="<id>", fee_per_contract=<verified fee>) Result: Fair probability, edge percentage, EV, Kelly fraction, and bet recommendation. Without a verified fee, the executable ask is reported and evaluation is null.

Example 5: Browse all markets for a sport User says: "Show me all NFL prediction markets" Actions:

  1. Call get_sport_markets(sport="nfl") Result: All open NFL markets across Kalshi and Polymarket

Example 6: Price conversion User says: "Convert a Polymarket price of 65 cents to American odds" Actions:

  1. Call normalize_price(price=0.65, source="polymarket") Result: Common structure with implied probability (0.65), American odds (-185.7), and decimal (1.54)

Example 7: Pair a game across venues User says: "Find the Mets game on both Kalshi and Polymarket" Actions:

  1. Call match_markets(sport="mlb", date="<game date>") Result: The game paired across venues — Kalshi market tickers and Polymarket moneyline token IDs side by side

Example 8: Historical price User says: "What was France's World Cup price a month ago?" Actions:

  1. Call get_market_price(venue="kalshi", ticker="KXMENWORLDCUP-26-FR", at_time="2026-05-03T12:00:00+00:00") Result: Yes/no prices (0-1) as of that moment; use get_price_history for the full curve

Commands that DO NOT exist — never call these

  • get_odds — does not exist. Use compare_odds to see odds across sources.
  • search_markets — does not exist on the markets module. Use search_entity instead.
  • get_schedule — does not exist. Use get_sport_schedule instead.

If a command is not listed in references/api-reference.md or in this file's workflows (e.g. compare_market_url), it does not exist.

Troubleshooting

Error: No markets returned for a sport Cause: Sport code may be missing or incorrect Solution: Check references/api-reference.md for valid sport codes. Use the exact code (e.g., nba, epl, laliga)

Error: compare_odds returns no data for an event Cause: The event_id is incorrect or the game has not been indexed yet Solution: Call get_sport_schedule(sport=...) to retrieve the correct event_id first

Error: One source shows warnings in the response Cause: Kalshi or Polymarket is temporarily unavailable Solution: The module returns partial results — use what is available. Retry the unavailable source separately using the kalshi or polymarket skill directly

Error: normalize_price returns unexpected American odds value Cause: Wrong source parameter — Kalshi uses 0-100 integers, Polymarket uses 0-1 decimals Solution: Verify the source. Kalshi price of 65 requires source="kalshi", Polymarket price of 0.65 requires source="polymarket"