prediction-markets
Polymarket Open Interest (USD, On-Chain)
Latest
374,552,745.44usd
Methodology
## What this measures
The dollars locked as collateral behind Polymarket's open positions at the end of each UTC day. Every Polymarket position is minted as a complete set of outcome tokens backed by 1 USDC.e (a dollar stablecoin), so the collateral held is open interest at $1 face per set. Daily.
## Why it matters
Polymarket is one of the two biggest prediction markets by trading. Its open interest shows how much money is committed to its outcomes, and it is read straight from the blockchain, so it does not depend on what the company reports.
## How to read it
Higher means more money locked in open positions. It climbs into big events, such as the 2024 U.S. election, and drops when they resolve and winners redeem. Read it beside Kalshi to see where event trading is concentrating.
## What it does not say
It counts collateral, not traders or trading activity. Winning positions in resolved markets stay in the total until their holders redeem, which many do within days. It covers Polymarket's global exchange on Polygon only, not Polymarket's separate U.S. exchange, which does not settle on Polygon. In its early years Polymarket ran automated market-maker pools; liquidity in those pools is collateral in the same contract and is counted. The Conditional Tokens contract is a shared standard, so any collateral other applications lock there is included too.
## Source
Palanor calculation from Polygon chain data: the USDC.e (0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174) balance at the last block of each UTC day of the Gnosis Conditional Tokens contract Polymarket uses (0x4D97DCd97eC945f40cF65F87097ACe5EA0476045) plus the NegRisk WrappedCollateral contract that backs multi-outcome markets (0x3A3BD7bb9528E159577F7C2e685CC81A765002E2). Since Polymarket's April 2026 upgrade users trade in pUSD, which the exchange unwraps to USDC.e before minting positions, so the same two balances still hold the collateral. Read with standard blockchain calls; no Polymarket data product is used.
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