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The Final Layer for Web3 Payments.

No Native Tokens. No Gas Fees. Just Pure USDC.

  • 01User signs EIP-712 off-chain — no gas token needed on live relay chains
  • 02Your backend submits one relay request while Q402 verifies the payload and gas tank
  • 03BNB, Ethereum, and X Layer are live now. Avalanche is available as beta onboarding by inquiry
↓See how it works
0M+
transactions processed
1 tx
full payment flow
4 chains
3 live + Avalanche beta
q402-sdk · v1.0
connected
// Initialize Q402 on any EVM chain
import { Q402 } from "@quackai/q402";
const q402 = new Q402({
apiKey: process.env.Q402_KEY,
chain: "bnb" // or eth | xlayer
});
// User signs — zero gas
const tx = await q402.send({ to: addr, amount: 50 });
// ✓ tx.success: true
// ✓ gas by user: $0.000000
BNBBNBETHETHAVAXAVAXbetaXX
EIP-712 + live relay rails

Multi-chain EVM · Live Relay + Beta Access

BNB Chain
BNB ChainMainnet Live
Ethereum
EthereumMainnet Live
X Layer
X LayerMainnet Live
Avalanche
AvalancheBeta
Arbitrum
ArbitrumComing Soon
Scroll
ScrollComing Soon
BNB Chain
BNB ChainMainnet Live
Ethereum
EthereumMainnet Live
X Layer
X LayerMainnet Live
Avalanche
AvalancheBeta
Arbitrum
ArbitrumComing Soon
Scroll
ScrollComing Soon

How Q402 works

User signature in. One relay out. BNB Chain, Ethereum, and X Layer use the live self-serve flow today, while Avalanche is available as beta access by inquiry.

A

User signs a payment authorization

User pays zero gas

The payer signs an off-chain EIP-712 payload for the token transfer. No native gas is required from the user on supported live chains.

B

Your backend calls Q402

Server-side relay request

Your server sends the signed payload and your API key to POST /api/relay. Q402 verifies the request and checks your chain-specific gas tank before broadcast.

C

Q402 relays on-chain

On-chain settlement

Q402's relayer broadcasts the transaction. After confirmation, the recipient receives USDC or USDT and the exact native gas cost is debited from your project tank.

BNB
ETH
AVAX
X

BNB, ETH, and X Layer share one live relay path. Avalanche is available as beta onboarding by inquiry because it does not currently support the standard Q402 / EIP-7702 self-serve flow.

q402-cli · live simulation
running
$ POST /api/relay (chain: bnb, token: USDC, amount: 50)
> Verifying API key and signed payload...
> Checking project gas tank...
> Gas tank sufficient ✓
> Broadcasting via Q402 relayer...
> tx: 0xf3c8a2...d91e CONFIRMED
> Recipient received: 50.00 USDC
> Gas debited from project tank ✓

Built for every use case

Any product that needs seamless, gasless USDC transfers on BNB Chain, Ethereum, or X Layer, with Avalanche beta onboarding available by inquiry.

⬡

DeFi Onboarding

Let new users interact with your DeFi protocol immediately — no gas-token top-up, no confusing wallet pop-ups.

◈

NFT Minting

Remove the gas barrier for NFT drops. Your users mint without ever touching native gas.

◻

SaaS Subscriptions

Charge USDC subscription fees on-chain. Users authorize once, you collect — gaslessly.

◆

Web3 Gaming

In-game purchases and micro-transactions with zero friction. Players focus on the game, not gas.

◎

B2B Payments

Send USDC payments between businesses on live relay chains with minimal cost and full on-chain auditability.

▲

Cross-App Wallets

Build embedded wallets and smart accounts where gas is invisible by design.

Start with Trial today.

Q402 is open for Trial right now. Starter, Growth, and Scale can be requested through inquiry.

Open Today
Trial
Available now

Self-serve access with a wallet-authenticated API key.

  • •Self-serve wallet signature flow
  • •Dashboard and gas tank access
  • •BNB, Ethereum, and X Layer live
  • •Avalanche beta access by inquiry
Coming Soon
Starter
$49

For teams preparing their first production rollout.

  • •Paid tier coming soon
  • •Inquiry-based onboarding today
  • •Good fit for early production teams
Coming Soon
Growth
$149

For growing products planning a broader launch.

  • •Paid tier coming soon
  • •Inquiry-based onboarding today
  • •Built for growing transaction demand
Coming Soon
Scale
$249

For higher-touch onboarding and scale-minded teams.

  • •Paid tier coming soon
  • •Inquiry-based onboarding today
  • •Best fit for larger rollout planning

BNB Chain, Ethereum, and X Layer are live today. Avalanche is available as beta access by inquiry, and Arbitrum and Scroll are coming soon.

Early Access

Scale your product to 100M Web3 users.

Without asking them to buy gas.

40+
Projects live
41M+
Txs processed
1 day
Avg. onboarding
Talk to Us →↗Read the docs

We typically respond within 24 hours.

gasless.js
.env
bnb mainnet · connected
gasless.js
1import { Q402 } from "@quackai/q402";
2
3const q402 = new Q402({
4 apiKey: process.env.Q402_KEY,
5 chain: "bnb",
6});
7
8const result = await q402.send({
9 payload,
10 signature,
11});
12
13// ✓ result.success true
14// ✓ result.txHash 0xf5cd...c466
15// ✓ result.gasUsed $0.000000
terminal
EIP-712 + EIP-7702·USDC · BNB Chain
gasUsed: $0.000000