If this happened to you do not despair, it's a common problem users face after bridging funds to a new network.
On every network you need to own the native gas token to pay for transaction fees. On Optimistic rollups like Arbitrum and Optimism the gas token is $ETH and on sidechains like Polygon and Gnosis chain the gas token is $MATIC and $xDAI respectively.
Below you will find some centralized exchanges (CEX) and fiat on-ramps to quickly get your hands on some of the needed cryptocurrencies on each network without paying high fees.
Arbitrum ($ETH)
- Binance (CEX)
- Crypto.com (CEX)
- Huobi (CEX)
- Transak (Fiat on-ramp)
Optimism ($ETH)
- Binance (CEX)
- Crypto.com (CEX)
- Huobi (CEX)
- Transak (Fiat on-ramp)
Polygon ($MATIC)
- Binance (CEX)
- Crypto.com (CEX)
- Huobi (CEX)
- Ramp Network (Fiat on-ramp)
- Transak (Fiat on-ramp)
Tip: There's also the option to make a gasless swap of any token into $MATIC on Polygon Wallet
Gnosis chain ($xDAI)
- Ramp Network (Fiat on-ramp)
- Mt Pelerin (Wallet w. Fiat on-ramp)
Tip: There are so-called "Faucets" like Stakely or Gimlu which give you a tiny amount of free xDAI to pay for 1-2 transactions if you are stuck