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Vextorium Polymarket History
x402
Vextorium Polymarket History is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-15).
Fetches historical probability time-series data for a Polymarket prediction market by slug, including current probability, min/max, and change over a chosen interval.
Price / call$0.004
Success—
StatusUnknown
How this service works
558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.
Output
Returns a JSON object with the market question text, the outcome label (e.g. 'Yes'), a time-series array of {date, probability_pct} objects, the current probability percentage, min/max probabilities over the period, the interval used, and the change in percentage points.
Example use cases
Tracking election odds over time
“Get me the weekly probability history for the Polymarket market slug 'will-donald-trump-win-the-2024-us-presidential-election', outcome 0, so I can see how the odds have moved over time.”
Monitoring a crypto event prediction
“Fetch the hourly Polymarket probability data for 'will-bitcoin-reach-100k-by-end-of-2025', outcome index 0, using the 1h interval — I want to see the current probability and how much it's shifted recently.”
Comparing current vs historical market probabilities
“Check the max interval history for Polymarket slug 'will-the-fed-cut-rates-in-march-2025', outcome 0 — give me the all-time high and low probabilities and the current reading.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/polymarket-history?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need historical probability data for a specific Polymarket prediction market, particularly for time-series charting, trend analysis, or monitoring how crowd-sourced event probabilities have evolved. Prefer this over generic DeFi data endpoints when the user explicitly references Polymarket markets or prediction market odds.
Side effects
- Invalid or non-existent slug returns an error or empty result
- Outcome index out of range returns null or error
- Unsupported interval value rejected at schema validation
- Market with insufficient history may return a sparse or empty series
- Network timeout or upstream Polymarket API unavailability
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| slug | string | |
| result | integer | Outcome index (0 = first) |
| interval | string |
Output
Schema · Response
{
"type": "json",
"example": {
"result": "Yes",
"series": [
{
"date": "2026-10-01T20:30+00:00",
"probability_pct": 0.05
},
{
"date": "2026-10-01T21:00+00:00",
"probability_pct": 0.05
}
],
"max_pct": 0.05,
"min_pct": 0.05,
"interval": "1d",
"question": "Will Oprah Winfrey win the 2028 Democratic presidential nomination?",
"change_pp": 0,
"current_probability_pct": 0.05
}
}Tags
x402
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