Ruby gem 'gasfree_sdk': Send USDT Without TRX on TRON

If you’re building Web3 applications on TRON, and especially dealing with USDT TRC‑20, you know the hassle: you need TRX to pay for bandwidth and energy, or buy and burn it—even for free transfers! With gasfree_sdk, you can use your own USDT to cover those fees, and your users don’t need to buy or rent TRX at all.

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⚡ Why Gasless USDT Transfers?Link to section: ⚡ Why Gasless USDT Transfers?Link to section: ⚡ Why Gasless USDT Transfers?#

• Zero TRX needed – No more buying TRX or estimating resources.
• Use USDT directly – Fees are deducted from the USDT you’re sending.
• Simplified UX – Lower friction for onboarding and micro‑transfers.

What’s changed on TRON?Link to section: What’s changed on TRON?Link to section: What’s changed on TRON?#

1. Tron network introduced “Gas‑Free” USDT transfers: Justin Sun announced a feature enabling USDT to cover gas costs directly—no TRX required (cryptotimes.io, coincodex.com, ironwallet.io, the-blockchain.com, coinscan.com, chainwire.org).
2. Press coverage confirms launch: Multiple outlets like Crypto Times, Crypto News Flash, The Blockchain News, and more noted that “Gas Free” would start in late Feb 2025, letting wallets and dApps send USDT without TRX (cryptotimes.io, binance.com).
3. Pilot rollouts have begun: Wallets like IronWallet and Tonkeeper Pro now support gasless USDT-TRC20 transactions, confirming user benefits (coincodex.com).

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🚀 What gasfree_sdk Lets You DoLink to section: gasfree_sdk Lets You DoLink to section: gasfree_sdk Lets You Do#

1. Backend signs USDT meta-tx You pay using USDT, and all TRX energy/bandwidth is covered transparently.

2. Integrated with Gelato Relay The script handles EIP‑712‑style signing and payload preparing for gasless relay.

3. True “gasless UX” Your users only interact with USDT—they never touch TRX.

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🛠️ How It WorksLink to section: 🛠️ How It WorksLink to section: 🛠️ How It Works#

1. InstallLink to section: 1. InstallLink to section: 1. Install#

gem install gasfree_sdk
# or in Gemfile:
gem 'gasfree_sdk'

2. ConfigureLink to section: 2. ConfigureLink to section: 2. Configure#

require 'gasfree_sdk'

GasfreeSdk.configure do |config|
  config.api_key = "your-api-key"
  config.api_secret = "your-api-secret"
  config.api_endpoint = "https://open.gasfree.io/tron/"
end

3. InitializeLink to section: 3. InitializeLink to section: 3. Initialize#

client = GasfreeSdk.client
# Get supported tokens
puts "Supported Tokens:"
tokens = client.tokens
tokens.each do |token|
  puts "  #{token.symbol} (#{token.token_address})"
  puts "    Activation Fee: #{token.activate_fee}"
  puts "    Transfer Fee: #{token.transfer_fee}"
end

# Get service providers
puts "\nService Providers:"
providers = client.providers
providers.each do |provider|
  puts "  #{provider.name} (#{provider.address})"
  puts "    Max Pending Transfers: #{provider.config.max_pending_transfer}"
  puts "    Default Deadline: #{provider.config.default_deadline_duration}s"
end

4. Get your Gasless USDT addressLink to section: 4. Get your Gasless USDT addressLink to section: 4. Get your Gasless USDT address#

user_private_key = "your-private-key"
user_address = "your-address"

puts "\nGasFree Account Info:"
account = client.address(user_address)
puts "  GasFree Address: #{account.gas_free_address}"
puts "  Active: #{account.active}"
puts "  Nonce: #{account.nonce}"

5. Prepare Meta-TransactionLink to section: 5. Prepare Meta-TransactionLink to section: 5. Prepare Meta-Transaction#

token = tokens.first
provider = providers.first

deadline_int = Time.now.to_i + provider.config.default_deadline_duration
message = {
  token: token.token_address,
  serviceProvider: provider.address,
  user: user_address,
  receiver: "TQ7ew8mijfJoQ2qSAqSXmjUx1KbB96oMqc",
  value: "100000000", # 100 USDT (6 decimals)
  maxFee: "2000000", # Activation fee + transfer fee
  deadline: deadline_int.to_s,
  version: 1,
  nonce: account_nonce
}

6. Sign the messageLink to section: 6. Sign the messageLink to section: 6. Sign the message#

sig = TronEIP712Signer.sign_typed_data(user_private_key, message)

7. Send ItLink to section: 7. Send ItLink to section: 7. Send It#

sdk_message = {
  token: message[:token],
  service_provider: message[:serviceProvider],
  user: message[:user],
  receiver: message[:receiver],
  value: message[:value],
  max_fee: message[:maxFee],
  deadline: message[:deadline].to_i,
  version: message[:version],
  nonce: message[:nonce]
}

request = GasfreeSdk::Models::TransferRequest.new(
  sdk_message.merge(sig: sig)
)

5. Verify & MonitorLink to section: 5. Verify & MonitorLink to section: 5. Verify & Monitor#

response = client.submit_transfer(request)
  puts "  ✅ Transfer submitted successfully!"
  puts "  Transfer ID: #{response.id}"
  puts "  State: #{response.state}"
  puts "  Estimated Fees:"
  puts "    Activation: #{response.estimated_activate_fee}"
  puts "    Transfer: #{response.estimated_transfer_fee}"

  # Monitor transfer status
  puts "\nMonitoring Transfer Status:"
  5.times do
    status = client.transfer_status(response.id)
    puts "  State: #{status.state}"
    puts "  Transaction Hash: #{status.txn_hash}" if status.txn_hash
    break if %w[SUCCEED FAILED].include?(status.state)

    sleep 2
  end

✅ Use CasesLink to section: ✅ Use CasesLink to section: ✅ Use Cases#

• Wallets & dApps wanting seamless USDT pickups
• Micro‑payments where TRX friction kills UX
• Platforms enabling DAO votes or community payouts

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📢 TRON Gasless News CoverageLink to section: 📢 TRON Gasless News CoverageLink to section: 📢 TRON Gasless News Coverage#

• “Tron to Enable Gas-Free USDT Transfers Next Week” — Crypto Times & others confirm feature by Justin Sun (mpost.io, binance.com, the-blockchain.com, cryptotimes.io).
• “Tron Introduces ‘Gas-Free’ USDT Transfers” — detailed blog coverage on full removal of TRX gas (coinscan.com).
• “Gasless USDT‑TRC20 Transactions in Tonkeeper Pro Are Now Live” — live support in wallets confirms real rollout (chainwire.org).

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📝 Contribute & FeedbackLink to section: 📝 Contribute & FeedbackLink to section: 📝 Contribute & Feedback#

Want to add features or tweak behaviors? PRs welcome in the repo. Ensure you include tests!

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💡 Final ThoughtsLink to section: 💡 Final ThoughtsLink to section: 💡 Final Thoughts#

TRON is now officially gas-free for USDT transactions, and gasfree_sdk empowers Ruby devs to leverage this natively. Send USDT, not TRX—streamlined, low-cost, and easy.

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📚 ReferencesLink to section: 📚 ReferencesLink to section: 📚 References#

• cryptotimes.io
• coinscan.com
• chainwire.org