Onramp
The onramp is how you get USDC to trade on Polymarket.
Prediction Markets 101 editorial team Updated April 16, 2026 1 min read
Definition
An onramp is a service that converts fiat currency to crypto. Polymarket's in-app MoonPay is an onramp; so is Coinbase for buying USDC.
Plain-English explanation
Polymarket supports MoonPay and Onramper as in-app onramps (3–5% fee). Alternative: buy USDC on Coinbase, Kraken, or Binance and withdraw to Polygon (usually free or very cheap).