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TRON is a blockchain platform with smart contract capabilities and unique resource model. This guide covers TRON-specific features when using Dfns wallets.

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Wallet activation

New TRON wallets require activation before they can send transactions. A wallet is activated when it first receives TRX.
Ensure your TRON wallet has at least 0.1 TRX before attempting to send transactions.

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Resource model

TRON uses a unique resource system instead of traditional gas:
ResourceUsed forHow to obtain
BandwidthNative TRX transfers, simple operationsFree daily allowance, or stake TRX
EnergySmart contract execution (TRC-20, TRC-721)Stake TRX, or pay in TRX

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Free bandwidth

Every TRON account receives 600 free Bandwidth Points daily, which is enough for approximately 2-3 simple TRX transfers.

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Energy for token transfers

TRC-20 token transfers (like USDT) require Energy. If you don’t have staked TRX for Energy, the network burns TRX from your balance to cover the cost. You can obtain Energy in several ways:
  • Stake TRX: Stake your own TRX to generate Energy
  • Rent Energy: Use third-party services to rent Energy, typically at lower cost than burning TRX
  • Burn TRX: Let the network automatically burn TRX from your balance (most expensive option)
TRON’s Dynamic Energy Model increases energy costs for heavily-used contracts. Popular tokens like USDT can cost significantly more energy than baseline estimates due to this multiplier.
For high-volume applications, consider staking TRX or renting Energy to reduce operational costs compared to burning TRX per transaction.

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Fee sponsorship

The Dfns Fee Sponsor feature is not available for TRON due to its unique resource model. Instead, use TRON’s native resource delegation to achieve the same result.

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Native resource delegation

TRON’s DelegateResource function allows a sponsor wallet to delegate bandwidth or energy to other wallets. This enables gasless transactions for end users. How it works:
  1. Sponsor stakes TRX using freezeBalanceV2 to generate resources
  2. Sponsor delegates resources to user wallets via DelegateResource
  3. User wallets can transact without paying fees (using delegated resources)

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Implementation

See the TRON SDK examples for complete implementation details using TronWeb’s delegateResource function.
The sponsor wallet must have staked TRX to generate the resources being delegated. Use freezeBalanceV2 to stake TRX for bandwidth or energy.

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Transfers

Use the Transfer Asset endpoint for all TRON transfers:
  • Native TRX: Use kind: Native with amount in SUN (1 TRX = 1,000,000 SUN)
  • TRC-10 tokens: Use kind: Trc10 with the token’s tokenId (native tokens, no smart contract)
  • TRC-20 tokens: Use kind: Trc20 with the token’s contract address (similar to ERC-20)
  • TRC-721 NFTs: Use kind: Trc721 with the NFT’s contract address and tokenId

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Address format

TRON addresses start with T followed by 33 alphanumeric characters:
  • Example: TJRabPrwbZy45sbavfcjinPJC18kjpRTv8

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Resource estimation

Before sending TRC-20 tokens, ensure you have sufficient resources:
  1. Check Energy balance: If zero, ensure you have TRX to burn
  2. Estimate cost: TRC-20 transfers typically cost 10,000-65,000 Energy (popular contracts like USDT may cost more due to the Dynamic Energy Model)
  3. Buffer: Keep extra TRX for unexpected costs

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Transaction expiration

TRON transactions expire 60 seconds after creation. If a transaction is not included in a block within this window, it becomes invalid and fails with TRANSACTION_EXPIRATION_ERROR.
When using the Transfer Asset endpoint, Dfns builds the transaction after policy approval completes, so the 60-second window is not a concern.
If you build transactions yourself using the Broadcast or Sign endpoints, the 60-second expiration starts from when you create the transaction. Take this into account when designing approval workflows - if policy approval takes longer than 60 seconds, the transaction will expire and need to be rebuilt.

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SDK integration

For full transaction control, use the Dfns SDK with TronWeb. See complete examples:
Last modified on February 26, 2026