Claude × Quack AI·Now live in Claude Desktop→
BNB
ETH
MNT
AVAX
INJ
X
STB
7 chains live

The final layer for stablecoin rails.

Zero gas. Seven EVM chains. Pure stablecoin flow — users pay in USDC or USDT, we cover the rest.

  • 01EIP-712 off-chain — users never hold a gas token
  • 02One relay call — we cover micro-gas on every chain
  • 03USDC / USDT settle in seconds, every tx auditable on-chain
↓See how it works
99.99%
Uptime
<0.9 sec
Inclusion time
1 tx
full payment flow
7 chains
mainnet live
q402-sdk · v1.6.0
connected
// Drop the SDK into any page
<script src="https://q402.quackai.ai/q402-sdk.js"></script>
// Initialize once
const q402 = new Q402Client({
apiKey: "q402_live_...",
chain: "bnb" // or avax | eth | mantle | injective | xlayer | stable
});
// User signs — zero gas, one call
const result = await q402.pay({ to, amount: "50.00", token: "USDC" });
// ✓ result.success: true
// ✓ gas paid by user: $0.000000
BNBBNBETHETHMNTMNTAVAXAVAXINJINJXXSTBSTB
EIP-712 + EIP-7702

Mainnet Live · Multi-chain EVM

BNB Chain
BNB ChainMainnet Live
EthereumMainnet Live
Mantle
MantleMainnet Live
Avalanche
AvalancheMainnet Live
Injective
InjectiveMainnet Live
X Layer
X LayerMainnet Live
Stable
StableMainnet Live
USDCStablecoin
USDTStablecoin
Arbitrum
ArbitrumDeploying
Scroll
ScrollDeploying
BNB Chain
BNB ChainMainnet Live
EthereumMainnet Live
Mantle
MantleMainnet Live
Avalanche
AvalancheMainnet Live
Injective
InjectiveMainnet Live
X Layer
X LayerMainnet Live
Stable
StableMainnet Live
USDCStablecoin
USDTStablecoin
Arbitrum
ArbitrumDeploying
Scroll
ScrollDeploying

How Q402 works

Three addresses. One transaction. Works on any EVM chain — BNB, Ethereum, Avalanche, Mantle, Injective, X Layer, Stable.

A

User signs off-chain

Zero gas needed

Address A signs a typed EIP-712 authorization. No gas, no blockchain interaction. Works from any EVM wallet on any supported chain.

B

API submits transaction

1 transaction total

Your backend (Address B) receives the signature and submits one on-chain transaction, sponsoring the micro-gas fee.

C

Recipient receives

On-chain verified

Address C receives the USDC instantly. Verifiable on Snowtrace, BscScan, Etherscan — whichever chain you use.

BNB
ETH
MANTLE
AVAX
INJ
X
STABLE

Same protocol, any EVM chain. Switch with one parameter.

q402-cli · live simulation
running
$ q402 simulate --chain bnb --amount 50
> Connecting to BNB Chain...
> Building EIP-712 payload...
> User signed (gas: $0.00000)
> Submitting via facilitator...
> tx: 0xf3c8a2...d91e CONFIRMED
> USDC transferred: $50.00
> Gas paid by user: $0.000000 ✓

Built for every use case

Any product that needs seamless, gasless USDC/USDT transfers on EVM.

⬡

DeFi Onboarding

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

◈

NFT Minting

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

◎

AI Agent InfrastructureNew

Run hundreds of agents on-chain. Pre-fund a shared Gas Tank once — every agent in your fleet executes gasless payments autonomously, no native token management needed.

◆

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-chain with minimal cost and full auditability.

▲

Cross-App Wallets

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

Pick a plan. Ship today.

Each purchase = credits + 30-day access. Top up within the window and your tier upgrades automatically. No gas, no friction — plug in the SDK and you're live.

Starter
$29/30-day access

For indie developers and early-stage projects.

  • ✓500 sponsored transactions
  • ✓All 7 EVM chains
  • ✓Full API access
  • ✓Community support
Get started
Most popular
Pro
$149/30-day access

For growing products with real users.

  • ✓10,000 sponsored transactions
  • ✓All 7 EVM chains
  • ✓Full API access
  • ✓Email support
Get started
Scale
$449/30-day access

For high-throughput DeFi applications.

  • ✓50,000 sponsored transactions
  • ✓All 7 EVM chains
  • ✓API access + webhooks
  • ✓Priority support
Get started
Enterprise
$1,999/30-day access

For mission-critical apps at any scale.

  • ✓500,000 sponsored transactions
  • ✓All 7 EVM chains
  • ✓SLA guarantee (99.9% uptime)
  • ✓Dedicated account manager
Get started

Running AI agents at scale?

Unlimited TX, Gas Tank pre-pay, all 7 chains. Built for autonomous agent pipelines.

Agent Plan →

BNB Chain pricing. Other chains may vary.  · Custom quote → · Docs →

Early Access

Scale your product to 100M Web3 users.

Without asking them to buy gas.

99.99%
Uptime
<0.9 sec
Inclusion time
7 chains
Mainnet live
↗Read the docs

We typically respond within 24 hours.

gasless.js
.env
bnb mainnet · connected
gasless.js
1// Drop-in script, no bundler required
2<script src="https://q402.quackai.ai/q402-sdk.js"></script>
3
4const q402 = new Q402Client({
5 apiKey: "q402_live_...",
6 chain: "bnb",
7});
8
9const result = await q402.pay({
10 to: recipient,
11 amount: "50.00",
12 token: "USDC",
13});
14
15// ✓ result.success true
16// ✓ result.txHash 0xd4e8…a3f1
17// ✓ result.method eip7702
18// ✓ gas paid by user $0.000000
terminal
EIP-712 + EIP-7702·USDC · BNB Chain
gasUsed: $0.000000