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Prediction Market Price History
x402
Prediction Market Price History is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-14).
Returns a normalized implied-probability time series and momentum summary (change, min/max, trend) for one outcome of a prediction market, identified by id, conditionId, or slug.
Price / call$0.015
Success—
StatusUnknown
How this service works
Odds/price history for ONE outcome of a prediction market (by id, 0x conditionId or slug): a normalized implied-probability time series plus a momentum summary — change, percent change, min/max, current and trend.
Output
Returns a normalized implied-probability time series (array of timestamp + probability pairs) for the specified outcome, along with a momentum summary including current price, price change, percent change, min and max prices over the window, and a trend direction label.
Example use cases
Monitoring a political election market
“What does the price history look like for the 'Will the Democratic candidate win the 2026 midterms?' market on Polymarket? Show me the Yes outcome over the last month and tell me the current implied probability and how much it has moved.”
Detecting momentum spikes on a crypto market
“Has there been any big momentum shift in the last 6 hours on the 'Will ETH reach $5000 in 2025?' Polymarket market? Give me the Yes price change, percent change, and trend direction.”
Comparing current vs historical odds for a sports event
“Pull the full price history for the Polymarket market with slug 'super-bowl-2026-chiefs-win' — I want the Yes outcome over the max available window so I can see the min and max implied probabilities it has ever hit.”
Technical details
Endpoint
GEThttps://api.agentstools.dev/prediction/pricesWhen to prefer
Choose this endpoint when you need historical implied-probability data or momentum analytics for a single Polymarket prediction market outcome — especially when you need a normalized time series rather than raw order book data, or when you want pre-computed momentum signals (change, trend, min/max) without doing the math yourself. Prefer this over generic market data APIs when working specifically with Polymarket conditionIds or slugs.
Side effects
- Invalid or unknown market id/slug returns a 404 or empty result
- Outcome name or index not found for the given market returns an error
- Unsupported venue parameter returns a validation error
- Fidelity value below 1 triggers a schema validation error
- Market with no trading history may return an empty time series
- Network or upstream Polymarket data unavailability causes a 5xx error
- Payment not included or insufficient USDC causes a 402 payment required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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