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Polymarket Midpoint Price
web-searchfinancial-dataprediction-marketsweathertraveldata
Polymarket Midpoint Price is a paid API for AI agents from AIsa MPP Data APIs at api.aisa.one, paid per call via MPP, $0.012/call, status unknown (last checked 2026-10-18).
Retrieves the midpoint price (average of best bid and best ask) for a single Polymarket prediction market token by its token ID.
Price / call$0.012
Success—
StatusUnknown
How this service works
Retrieves the midpoint price for a specific token ID. The midpoint is calculated as the average of the best bid and best ask prices. <!-- aisa-pricing:start --> Published reference price: $0.012 USD per successful request. Account-specific pricing and final settlement may differ. <!-- aisa-pricing:end -->
Output
Returns a JSON object with a single field 'mid_price' as a string (e.g. '0.45'), representing the average of the current best bid and best ask prices for the specified token. This value implicitly reflects the market's consensus probability for the outcome.
Example use cases
Check implied probability of election outcome
“What's the current midpoint price for Polymarket token 52114319501245915516055106046884209969926127482827954674443846427813813222426? I want to know the market's implied probability.”
Track arbitrage spread across markets
“Get me the midpoint price for Polymarket token ID 71321045679252212594626385532706912750332728571942532289631379312455583992563 so I can compare it against another exchange.”
Monitor fair value before placing order
“Before I trade, can you pull the midpoint price for token 16678291189211314787145083999015737376658799626183230671758641503291735614088 on Polymarket so I know what the fair mid-market value is right now?”
Technical details
Endpoint
GEThttps://api.aisa.one/apis/v1/polymarket/midpoint?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a single neutral price reference for a Polymarket token without committing to buy or sell side — ideal for fair-value estimation, implied probability calculation, or pre-trade analysis. Prefer this over the bid or ask price endpoints when you want a balanced price signal. Use the batch 'Midpoints' endpoint instead if you need prices for multiple tokens at once.
Side effects
- Invalid or unknown token_id returns an error or null mid_price
- Token ID for a closed or resolved market may return stale or unavailable data
- Network latency may cause slightly outdated midpoint if markets are moving fast
- Missing required token_id parameter results in a 400 bad request error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token_idrequired | string | Token ID (asset ID) |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| mid_pricerequired | string | Midpoint price as a string |
Tags
web-searchfinancial-dataprediction-marketsweathertraveldatasearch
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