// Find and analyze arbitrage opportunities across prediction markets like Polymarket and Kalshi. Use when you need to match equivalent markets, compare prices, and verify liquidity before acting on a spread.
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| name | prediction-market-arbitrage |
| description | Find and analyze arbitrage opportunities across prediction markets like Polymarket and Kalshi. Use when you need to match equivalent markets, compare prices, or verify liquidity before acting on a spread. |
| license | MIT |
| compatibility | Designed for Agent Skills compatible clients such as OpenClaw, Claude Code, Hermes, and GitHub-backed skill catalogs. Requires system binaries curl, python3, environment variables AISA_API_KEY and internet access to api.aisa.one. |
| metadata | {"author":"AIsa","version":"1.0.0","homepage":"https://aisa.one","repository":"https://github.com/baofeng-tech/agent-skills","tags":"market,prediction","platforms":"agentskills.io,agentskill.sh,github","primary_env":"AISA_API_KEY"} |
| allowed-tools | Read Bash Grep |
Find and analyze arbitrage opportunities across prediction markets such as Polymarket and Kalshi using the AIsa API.
Use when you need to:
One API key gives agents a unified way to query market matching, pricing, and liquidity data across supported prediction markets.
Works with any agentskills.io-compatible harness, including:
Requires Python 3, a POSIX shell, and AISA_API_KEY (available from aisa.one).
"Find the current price difference for the US election market between Polymarket and Kalshi."
"Find the Kalshi equivalent for this Polymarket sports event."
"Monitor the price spread for the upcoming NBA game across all supported prediction markets."
"Check the orderbook depth on both platforms to see if the arbitrage opportunity is actionable."
export AISA_API_KEY="your-key"
Most endpoints require an ID from the /markets or /matching-markets responses. Query markets first, then pass the relevant ID to downstream endpoints.
token_id: Query /polymarket/markets, find side_a.id or side_b.id in the response, then use that value in the market price and orderbook endpoints.market_ticker: Query /kalshi/markets, find market_ticker in the response, then use that value in the market price and orderbook endpoints.The first step in arbitrage analysis is finding the same event on multiple platforms.
# Find equivalent markets across platforms using a Polymarket slug
curl -X GET "https://api.aisa.one/apis/v1/matching-markets/sports?polymarket_market_slug={polymarket_market_slug}" \
-H "Authorization: Bearer $AISA_API_KEY"
# Or find equivalent markets using a Kalshi event ticker
curl -X GET "https://api.aisa.one/apis/v1/matching-markets/sports?kalshi_event_ticker={kalshi_event_ticker}" \
-H "Authorization: Bearer $AISA_API_KEY"
# Find all matching sports markets across platforms for a specific date
curl -X GET "https://api.aisa.one/apis/v1/matching-markets/sports/{sport}?date={date}" \
-H "Authorization: Bearer $AISA_API_KEY"
Once matching markets are found, fetch the current prices on both platforms to calculate the spread.
# token_id comes from side_a.id or side_b.id in /polymarket/markets response
curl -X GET "https://api.aisa.one/apis/v1/polymarket/market-price/{token_id}" \
-H "Authorization: Bearer $AISA_API_KEY"
# market_ticker comes from /kalshi/markets response
curl -X GET "https://api.aisa.one/apis/v1/kalshi/market-price/{market_ticker}" \
-H "Authorization: Bearer $AISA_API_KEY"
A price discrepancy is only actionable if there is enough liquidity to execute the trades.
# token_id comes from side_a.id or side_b.id in /polymarket/markets response
curl -X GET "https://api.aisa.one/apis/v1/polymarket/orderbooks?token_id={token_id}" \
-H "Authorization: Bearer $AISA_API_KEY"
# ticker is the same value as market_ticker from /kalshi/markets response
curl -X GET "https://api.aisa.one/apis/v1/kalshi/orderbooks?ticker={ticker}" \
-H "Authorization: Bearer $AISA_API_KEY"
| Endpoint | Description | Key Params |
|---|---|---|
/matching-markets/sports | Find matching sports markets | polymarket_market_slug or kalshi_event_ticker |
/matching-markets/sports/<sport> | Find sports markets by date | sport, date |
| Endpoint | Description | Key Params |
|---|---|---|
/polymarket/market-price/<token_id> | Get Polymarket price | token_id, at_time |
/kalshi/market-price/<market_ticker> | Get Kalshi price | market_ticker, at_time |
/polymarket/orderbooks | Get Polymarket orderbook | token_id, start_time, end_time |
/kalshi/orderbooks | Get Kalshi orderbook | ticker, start_time, end_time |
The {...} values in the cURL examples are product-level placeholders and must be replaced before execution.
Execution constraint:
curl, the agent or runner must verify that every {...} placeholder has been replaced with a concrete value.{token_id}, {market_ticker}, {sport}, or {date} is still present in the final command, do not execute the command. Fail fast and surface a missing-parameter error instead.This constraint is required because a literal brace placeholder may be interpreted by curl as URL globbing syntax rather than as plain text.
0.65 means a 65% implied probability.1.0. For example, if "Yes" is trading at 0.40 on Polymarket and "No" is trading at 0.55 on Kalshi, buying both guarantees a payout of 1.00 for a total cost of 0.95, before fees and slippage./orderbooks endpoints. A price difference might exist, but if the orderbook lacks depth, executing the trade may eliminate the profit.| API | Cost |
|---|---|
| Prediction market read query | $0.01 |
export AISA_API_KEY="your-key"See API Reference for complete endpoint documentation.