Гаманець для ULTRON

What is ULTRON (ULX)?

ULX is the native coin of Ultron, an EVM-compatible layer one where it pays transaction fees, secures the chain through staking and funds the applications built on it. On its home chain it behaves the way a base coin does anywhere: it is not a contract, it is the unit the validators are paid in.

That is not the form most people end up holding. ULX also circulates as bridged tokens on several other EVM chains, issued as ordinary smart contracts there. These are representations, each with its own contract on its own network, and the important consequence is fees: to move a bridged ULX you need the host chain's own coin, not ULX. Send BNB Chain ULX with an empty BNB balance and the transaction simply will not go. Getting a bridged balance back to the Ultron chain, where it can be staked, means using a bridge rather than a plain transfer.

Supported networks in Tangem (5): Ethereum, BNB Smart Chain, Avalanche, Polygon POS, Fantom.

That fee coin is the practical reason Tangem suits this token. You keep ULX and the gas coin for whichever chain it sits on in the same wallet, and signing is a tap of the card against the phone, with no cable and nothing to charge. Paying a fee shouldn't require a second device, and with this setup it doesn't.