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Polymarket Open Interest Lookup
web-searchfinancial-dataprediction-marketsweathertraveldata
Polymarket Open Interest Lookup is a paid API for AI agents from AIsa MPP Data APIs at api.aisa.one, paid per call via MPP, $0.00044/call, status unknown (last checked 2026-10-18).
Retrieves open interest values for one or more Polymarket prediction markets by their market IDs.
Price / call$0.00044
Success—
StatusUnknown
How this service works
Get open interest for one or more markets. <!-- aisa-pricing:start --> Published reference price: $0.00044 USD per successful request. Account-specific pricing and final settlement may differ. <!-- aisa-pricing:end -->
Output
Returns an array of objects, each containing a market ID (0x-prefixed 64-hex string) and its corresponding open interest value as a number. If multiple market IDs are queried, one object is returned per market.
Example use cases
Check liquidity before trading
“Before I take a position, can you tell me the open interest on Polymarket market 0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917 so I know how liquid it is?”
Compare OI across multiple markets
“Can you pull the open interest for these three Polymarket markets — 0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917, 0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890ab, and 0x1111111111111111111111111111111111111111111111111111111111111111 — so I can compare how much is at stake in each?”
Monitor market size over time
“Keep an eye on the open interest for Polymarket market 0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917 and let me know if it changes significantly.”
Technical details
Endpoint
GEThttps://api.aisa.one/apis/v1/polymarket/oi?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need open interest data specifically from Polymarket prediction markets, identified by their 0x-prefixed market contract addresses. It supports batch queries for multiple markets in a single call, making it efficient for comparing OI across markets. Prefer this over general market data APIs when you need Polymarket-specific OI figures for trading analysis, liquidity assessment, or monitoring.
Side effects
- Invalid market ID format (not a 0x-prefixed 64-hex string) returns a validation error
- Market ID not found on Polymarket returns no data or zero value
- Empty market array or missing parameter returns an empty array
- Network or upstream Polymarket API unavailability causes request failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| market | array |
Output
Schema · Response
{
"type": "array",
"items": {
"type": "object",
"properties": {
"value": {
"type": "number"
},
"market": {
"type": "string",
"example": "0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917",
"pattern": "^0x[a-fA-F0-9]{64}$",
"description": "0x-prefixed 64-hex string"
}
}
}
}Tags
web-searchfinancial-dataprediction-marketsweathertraveldatasearch
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