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Polymarket Price History
x402
Polymarket Price History is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Returns historical implied probability samples for a Polymarket outcome token, including timestamped price series and first/last/min/max summary statistics.
Price / call$0.002
Success—
StatusUnknown
How this service works
Historical odds (implied probabilities) for a Polymarket outcome token. Returns timestamped price samples with first/last/min/max summary. Useful for: tracking probability shifts around events, computing realized volatility, backtesting prediction strategies.
Output
A list of timestamped price samples (implied probabilities between 0 and 1) for the specified Polymarket outcome token, plus a summary with first, last, minimum, and maximum values across the requested lookback window.
Example use cases
Example prompt
“Show me the hourly probability history for Polymarket token 12345678 over the past week — I want to see the first, last, min, and max prices and all the timestamped samples.”
Technical details
Endpoint
POSThttps://agent402.tools/api/polymarket-price-historyWhen to prefer
Use this endpoint when you need historical probability timeseries data for a specific Polymarket outcome token — particularly for analyzing how market sentiment shifted around events, computing volatility, or backtesting prediction strategies. Prefer this over the live orderbook endpoint when historical context matters rather than current bids/asks.
Side effects
- Invalid or unknown tokenId returns an error or empty result
- fidelity value outside 1-720 range rejected
- Unrecognized interval string returns an error
- Polymarket CLOB data unavailable for the requested window
- Network timeout or upstream API failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenId | string | CLOB token id (decimal string) from market.clobTokenIds. |
| fidelity | number | Sample granularity in minutes (1-720, default 60). |
| interval | string | Lookback window: 1h, 6h, 1d, 1w, 1m, max (default 1d). |
Output
Schema · Response
{
"type": "json",
"example": {
"max": 0.67,
"min": 0.55,
"last": 0.62,
"count": 24,
"first": 0.58,
"points": [
{
"price": 0.58,
"timestamp": 1751200000
},
{
"price": 0.59,
"timestamp": 1751203600
}
],
"source": "polymarket-clob",
"tokenId": "72909...",
"interval": "1d",
"fidelityMinutes": 60
}
}Tags
x402
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