Terms of Service

1. Acceptance of Terms

By accessing or using the Q402 gasless payment relay service, APIs, SDKs, or any related software provided by Quack AI(“Q402”, “we”, “us”), you (“Customer”, “you”) agree to be bound by these Terms of Service. If you do not agree, do not use the service.

2. Description of Service

Q402 provides a gasless ERC-20 payment relay infrastructure. Customers integrate the Q402 SDK or API to allow their end-users to transfer USDC/USDT on supported EVM chains without holding native gas tokens. Q402's relayer wallet pays all on-chain transaction fees on the customer's behalf.

Supported chains include Avalanche, BNB Chain, Ethereum, X Layer, and Stable (subject to change). Q402 does not custody, hold, or control any customer or end-user funds at any time.

3. API Keys & Accounts

• API keys are issued to the blockchain address that completes on-chain payment verification.
• You are responsible for keeping your API key confidential. Do not expose keys in client-side code or public repositories.
• You may rotate your API key at any time via the dashboard. The old key is immediately revoked.
• Q402 reserves the right to revoke API keys that violate these terms without prior notice.
• Accounts are non-transferable. You may not sell, resell, or sublicense access to the Q402 API.

4. Subscription & Payment

• Subscriptions are activated via on-chain USDC/USDT payment to the Q402 payment address.
• All payments are final and non-refundable once on-chain confirmation is received.
• Each paid purchase grants a 30-day access window plus the transaction credits listed for the selected tier. Credits accumulate across renewals; access days stack if you renew before expiry.
• Your plan level is determined by cumulative paid amount within an active 30-day window, normalized to BNB Chain base pricing (Ethereum and Avalanche payments are converted at the published chain multiplier). When cumulative spend crosses a higher tier's threshold, your plan upgrades automatically. Plans never downgrade while the window is active. If the window lapses (no payment for 30 days after the last renewal), cumulative resets and the next payment establishes a new window.
• Transaction credits are enforced as stated on the pricing page at purchase time.
• Q402 reserves the right to change pricing with 14 days' notice via email or dashboard notification.

5. Gas Tank

Some plans require customers to pre-fund a Gas Tank by depositing native tokens (BNB, ETH, AVAX, OKB, or USDT0) to the Q402 Gas Tank address displayed per-chain in your Dashboard → Gas Tank tab. Do not send Gas Tank deposits to the relayer (signer) address. These deposits are used exclusively to cover on-chain gas costs for your relayed transactions.

Gas Tank balances are non-refundable except by explicit arrangement with Q402 support. Q402 is not liable for relay failures caused by insufficient Gas Tank balance.

For the Stable chain, USDT0 serves as both the gas token and payment token. Gas Tank deposits on Stable must be made in USDT0.

6. Acceptable Use

You agree NOT to use Q402 to:

• Facilitate transactions that violate applicable laws or regulations in any jurisdiction.
• Process payments for sanctioned individuals, entities, or countries (OFAC, EU, UN sanction lists).
• Conduct money laundering, terrorist financing, or any other financial crime.
• Attempt to manipulate, exploit, or abuse the relay infrastructure (e.g., replay attacks, signature forgery).
• Exceed your plan's relay quota through artificial inflation or coordinated abuse across multiple keys.
• Resell or white-label Q402 relay infrastructure without a separate written agreement.

Q402 reserves the right to suspend service immediately upon detection of prohibited use.

7. Rate Limits & Quotas

Each purchase includes a fixed number of transaction credits and per-IP API rate limits. Credits are consumed per successful relay and roll forward across renewals — any unused credits remain on your account and are added to credits granted by your next purchase. Relay access additionally requires an active 30-day access window, which extends with each renewal. Exhausting credits suspends relay until you top up with an additional purchase on the pricing page. Q402 may adjust limits at any time to protect infrastructure stability.

8. Webhooks

Webhook delivery is best-effort. Q402 does not guarantee delivery of webhook events in the event of your server downtime, network failures, or misconfiguration. Q402 is not liable for business logic failures resulting from missed webhook events. You should reconcile transaction state using the /api/transactions endpoint as the source of truth.

9. Sandbox Mode

Sandbox API keys (q402_test_ prefix) do not submit on-chain transactions. Sandbox responses are simulated and must not be used as evidence of real payment settlement. Q402 is not liable for any claims arising from sandbox transactions being treated as real.

10. No Custody / Non-Custodial

Q402 is a non-custodial relay protocol. Q402 does not hold, control, or have access to customer or end-user funds. All token transfers occur directly between the end-user's wallet and the recipient via EIP-7702 delegation. Q402 is not a money transmitter, payment processor, or financial institution.

11. Disclaimers & Limitation of Liability

THE SERVICE IS PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND. Q402 DOES NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED, ERROR-FREE, OR THAT RELAY TRANSACTIONS WILL SUCCEED ON ALL CHAINS AT ALL TIMES.

BLOCKCHAIN NETWORKS ARE OUTSIDE Q402'S CONTROL. Q402 IS NOT LIABLE FOR FAILED TRANSACTIONS DUE TO NETWORK CONGESTION, CHAIN OUTAGES, CONTRACT BUGS, OR CHANGES IN EIP-7702 SUPPORT BY CHAIN VALIDATORS.

IN NO EVENT SHALL Q402'S AGGREGATE LIABILITY EXCEED THE AMOUNT YOU PAID FOR THE SERVICE IN THE 30 DAYS PRECEDING THE CLAIM.

12. Indemnification

You agree to indemnify and hold harmless Quack AIand its officers, directors, and employees from any claims, damages, or expenses (including legal fees) arising from your use of the service, your violation of these terms, or your end-users' transactions processed through your integration.

13. Modifications to Terms

Q402 may update these Terms at any time. Material changes will be communicated via email or dashboard notice at least 7 days before taking effect. Continued use of the service after the effective date constitutes acceptance.

14. Governing Law

These Terms are governed by and construed in accordance with applicable laws. Any disputes shall be resolved by binding arbitration. Nothing in these Terms limits either party's ability to seek injunctive or other equitable relief.

15. Contact

Questions about these Terms: business@quackai.ai