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Polymarket Bid-Ask Spread
x402
Polymarket Bid-Ask Spread is a paid API for AI agents from proxy.suverse.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Returns the current bid-ask spread for a specific Polymarket outcome token from the live CLOB order book, serving as a liquidity and uncertainty gauge.
Price / call$0.05
Success—
StatusUnknown
How this service works
Current bid-ask spread for a Polymarket outcome token from the live order book - a liquidity/uncertainty gauge. Free Polymarket CLOB data. token_id from market detail.
Output
Returns the current best bid price, best ask price, and the calculated bid-ask spread (ask minus bid) for the specified Polymarket outcome token from the live Central Limit Order Book. A narrow spread indicates high liquidity and market confidence; a wide spread indicates thin liquidity or high uncertainty.
Example use cases
Pre-trade liquidity check
“Before I place a bet on that Polymarket election market, can you pull the current bid-ask spread for token ID 0xabc123 so I know how much slippage to expect?”
Uncertainty gauge for event monitoring
“I'm tracking a Polymarket market on the Fed rate decision — fetch the bid-ask spread for token 0xdef456 so I can see how uncertain traders are right now.”
Arbitrage opportunity detection
“Check the bid-ask spread on Polymarket outcome token 0x789xyz — I'm looking for wide spreads that might signal an arbitrage opportunity across prediction platforms.”
Technical details
Endpoint
POSThttps://proxy.suverse.io/v1/data/polymarket-bid-ask-spreadWhen to prefer
Choose this endpoint when you need real-time bid-ask spread data specifically from Polymarket's CLOB for a known outcome token ID. It is ideal for pre-trade analysis, liquidity screening, or uncertainty measurement on prediction market positions. Prefer this over general market data APIs when working within the Polymarket ecosystem and you already have the token_id from a market detail lookup.
Side effects
- Invalid or unknown token_id returns an error or empty order book
- Token with no active orders returns null bid or ask
- Network latency may cause slightly stale order book snapshots
- Malformed request body returns a 400-level error
- Payment failure (x402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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