Cross-platform arbitrage detection between Polymarket and Kalshi: matched markets, price s
Cross-platform arbitrage detection between Polymarket and Kalshi: matched markets, price spreads, fee-adjusted EV. Coverage: liquid Polymarket markets in politics/geopolitics/elections/tech/economy/finance; low-volume long-tail, sports, culture, and weather are not included.
10000 (raw units)
price
2
calls / 30d
2
unique payers
2026-09-01
updated
Provider
polynews.news · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x6ee49a7872844397Fb52870Cc07b308fFADC9427",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "10000",
"maxTimeoutSeconds": 300
},
{
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "76xzzgua9K8985GqGMwB946zTFtHvjTd9MfGoTYfys3d",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"amount": "10000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"category": "politics",
"limit": "50"
},
"type": "http"
},
"output": {
"example": {
"data": {
"computedAt": "2026-05-12T04:25:00.000Z",
"kalshiDataAgeSec": 45,
"matchedMarkets": 73,
"opportunities": [
{
"arbitrage": {
"confidence": "high",
"feeEstimate": 0.038,
"impliedProfit": 0.052,
"spreadNet": 0.052,
"spreadRaw": 0.09,
"type": "BUY_YES_POLY_NO_KALSHI"
},
"categoryPoly": "finance",
"id": "0xpoly__BTC200K-26DEC31",
"kalshiTitle": "BTC at or above $200,000 by Dec 31, 2026",
"kalshiYesAsk": 0.41,
"kalshiYesBid": 0.39,
"matchConfidence": 0.87,
"polymarketNoPrice": 0.68,
"polymarketQuestion": "Will Bitcoin reach $200K by Dec 31, 2026?",
"polymarketYesPrice": 0.32
}
],
"polymarketDataAgeSec": 30,
"totalKalshiMarkets": 13802,
"totalPolymarkets": 1074
},
"meta": {
"endpoint": "/api/v1/arbitrage",
"latencyMs": 1240,
"tier": "alpha",
"timestamp": "2026-05-12T04:30:00.000Z",
"version": "v1"
}
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"category": {
"type": "string"
},
"limit": {
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"properties": {
"matchedMarkets": {
"type": "number"
},
"opportunities": {
"items": {
"properties": {
"arbitrage": {
"description": "Fee-adjusted arb calc",
"properties": {
"confidence": {
"description": "high | medium | low",
"type": "string"
},
"impliedProfit": {
"description": "Fee-adjusted EV",
"type": "number"
},
"spreadNet": {
"description": "After fees",
"type": "number"
},
"spreadRaw": {
"type": "number"
},
"type": {
"description": "e.g. BUY_YES_POLY_NO_KALSHI",
"type": "string"
}
},
"type": "object"
},
"kalshiTitle": {
"type": "string"
},
"kalshiYesAsk": {
"type": "number"
},
"matchConfidence": {
"type": "number"
},
"polymarketQuestion": {
"type": "string"
},
"polymarketYesPrice": {
"type": "number"
}
},
"type": "object"
},
"type": "array"
}
},
"type": "object"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://polynews.news/api/v1/arbitrage" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://polynews.news/api/v1/arbitrage");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://polynews.news/api/v1/arbitrage")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/4879.json, and this resource appears in /discovery/resources and /discovery/search.