Send USDT on TRON
without holding TRX

Why agents need GasFree

Every USDT transfer on TRON requires energy. Energy requires TRX. An AI agent that wants to pay for an API call needs to first acquire TRX, estimate energy, handle delegation -- none of which is its actual task. GasFree eliminates this: one off-chain signature, MERX handles the rest.

How it works

Supported tokens

Activation fee charged once per agent wallet. All subsequent transfers are $2.

Mainnet contract

Quick start

# 1. Get a fee quote
curl "https://merx.exchange/gasfree/quote?user=TYourAddress\
&token=TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t&value=10000000"

# 2. Sign TIP-712 PermitTransfer (in your agent code)
const sig = await tronWeb.trx._signTypedData(domain, types, message)

# 3. Submit to MERX
curl -X POST https://merx.exchange/gasfree/submit \
  -H "Content-Type: application/json" \
  -d '{"token":"TR7NHq...","user":"TYour...","receiver":"TRecv...",
       "value":"10000000","maxFee":"4000000","deadline":...,
       "version":1,"nonce":0,"sig":"..."}'

# 4. Poll status
curl https://merx.exchange/gasfree/{traceId}
# -> { "state": "SUCCEED", "txnHash": "..." }

API endpoints

Base URL: https://merx.exchange

x402 integration

MERX is the only TRON x402 facilitator listed in the coinbase/x402 ecosystem registry. When your agent encounters HTTP 402, it can pay with USDT, USDC, or USDD on TRON via GasFree -- same as paying with USDC on Base.

// x402 402 response includes TRON option:
{
  "accepts": [
    { "network": "eip155:8453", "asset": "USDC on Base" },
    { "network": "tron:0x2b6653dc", "asset": "USDT on TRON" }
  ]
}

// Agent chooses TRON, signs TIP-712, gets the resource.
// No TRX needed. MERX handles energy.

Comparison