Cross-platform arbitrage detection between Polymarket and Kalshi
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.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
631 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://polynews.news/api/v1/arbitrage
| Category | Market data |
|---|---|
| Provider host | polynews.news |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.01 | 631 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"category": "politics",
"limit": "50"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$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"
}