Compatibility with cryptocurrencies: BTC, ETH, USDT

1) Short answer

Instant games can fully work with BTC, ETH and USDT if the platform supports compatible networks and correctly processes deposits/outputs, conversion rates, confirmations and compliance requirements. For budget stability, stablecoins (USDTs) are preferred; for speed - Lightning (BTC) or L2-network (ETH).

2) Integration models (architectural)

Custodial model (operator keeps funds): quick deposit credit, single balance, simple conclusions; storage/safety responsibilities at the operator.
Uncastodial (player's wallet): login via WalletConnect/browser wallet, transactions to smart contracts/addresses; higher friction, less storage risks for the operator.
Through a payment provider/onramp: fiat ↔ crypto exchange, network routing, Travel Rule/out-of-the-box sanctions checks.

3) Networks and asset formats

BTC:

• L1 (on-chain) - reliable but volatile commissions/confirmations.
• Lightning - micropayments almost instantly, low fees; correct reception of channels/invoices is needed.
ETH and ecosystem:
• Mainnet - high commissions at their peak, reliable infrastructure.
• L2 (Arbitrum/Optimism/Base/Polygon, etc.) - lower commission and faster finalization; explicit network marking in the UI is important.
USDT (stablecoin):
• ERC-20 (Ethereum), TRC-20 (TRON), BEP-20 (BNB Chain) и др. The network is always specified along with the address; network error = loss of funds.

4) Rate denomination and conversion

Fiat metric in UI (AUD/USD/EUR): the rate is stored in crypto, but displayed in fiat at the market rate (price feed with cache).
Crypto metric in UI (sats/ETH/USDT): convenient for the crypto audience, but need warnings about volatility (except for stables).
Auto-conversion of deposits: when BTC/ETH enters the operator's wallet, funds can be converted to internal USDT for stable payments and quick payments.
Rounding and minimum denominations: set by the provider; exclude "dust" at rates/deductions.

5) Deposits: confirmations and crediting

Address + network + (if necessary) memo/tag - all three parameters must be confirmed by the user.
The requirement for acknowledgements is configured by the platform (different thresholds for BTC/ETH/TRON/L2). Prior to reaching the threshold, funds are seen as "pending."
Zero-conf credit (instant credit before confirmations) is risky and applies only with strict limits/risk analytics.
Lightning deposits are credited by invoice; The UI should show the timer and the payment status.

6) Conclusions: speed, commissions, safety

Network commission (miner/gas/route fee) + platform commission (fix/%) - displayed until the conclusion is confirmed.
Processing: automatic for small amounts; large - with manual verification/TAC.
White address lists and delayed addition of a new address (cool-off) reduce the risk of theft.
Idempotence of applications: repeated pressing "output" does not create duplicates; the transaction status is monitored in real time.

7) Commissions and network selection (practice)

BTC: small translations are better than Lightning; large - L1 (with reasonable confirmation threshold).
ETH: If commission is important, use L2; large conclusions - mainnet as needed.
USDT: for frequent small transactions - a network with low fees (for example, TRC-20 or L2), for compatibility - ERC-20.
In UI: Always show an iterative choice of network live assessment of the commission.

8) Risks and protections

Incorrect network/address → permanent loss. Solution: large banner with the selected network, confirmation before sending, QR code.
BTC/ETH volatility → "drawdown" of purchasing power between deposit and game. Solution: auto conversion to USDT, fix bets in stable.
Network loads → long confirmations and stuck transactions. Solution: dynamic commission selection, status notifications, retry/replace-by-fee (where available).
Phishing/address spoofing → domain verification, clipboard protection, address books with verification.
Duplicates/repetitions → idempotency keys, nonce and status control.

9) Compliance: KYC/AML/KYT and Travel Rule

KYC/AML: Verification of identity and source of funds for real money and large limits.
KYT (Know Your Transaction): behavioral/blockchain address analytics (sanctions, darknet, mixers).
Travel Rule: minimum dataset exchange between VASPs in cross-border transfers; in UI - understandable hints when required.
Regional limits: Supported networks/assets and limits vary by platform jurisdiction.

10) UX requirements for "instant" scenario

Second-screen for login/payment (QR/deep link to wallet) so as not to block the game cycle.
Real-time statuses: "pending/in mempool/confirmed/credited."
Single balance marked currency + conversion rate and last update time.
Transaction history: hashes, networks, fees, totals; export to CSV.
Errors in readable language: "sent to the wrong network" with an explanation of the consequences.

11) Recommendations to players

Always check: network, address, memo/tag, commission before sending.
For a stable budget, keep the USDT; for quick small replenishments - Lightning/L2.
Make a test transfer of a small amount on the first deposit to a new network/address.
Include 2FA, use whitelist addresses, do not store large amounts on the stock exchange/in hot wallets unnecessarily.
Keep track of minimum deposit/withdrawal amounts and processing times.

12) Operator checklist (tech/process)

1. Supported networks and assets are documented; in UI - explicit network selection.
2. Threshold of confirmations by assets and amounts; quick credit - only with risk limits.
3. Reserve/cache and folback courses; rounding and minimum ratings are given.
4. KYC/AML/KYT are built into onboarding and leads; address books with "cool-off."
5. Idempotency of deposits/withdrawals; Real-time transaction statuses
6. Security: multi-whitewash/hardware keys for cold storage; separate hot limits.
7. User documentation: networks, tags, commissions, minimals, SLA by conclusions.
8. Mempool/gas price monitoring and delay notifications; "accelerate" button (where applicable).
9. Immutable transaction logs and audit reports.

13) Typical mistakes and how to avoid them

Displaying "USDT" without a network → always write "USDT (ERC-20/TRC-20/...)."
Automatic substitution of irrelevant commission → use dynamic hints/ranges.
Absence of memo/tag (XRP/XLM, etc.) → large warning, blocking sending without filling.
Merging deposits from different networks into one address → separate addresses across the network.
Hide conversion rate/windows → show details before exchange.

14) The bottom line

Compatibility of instant games with BTC, ETH and USDT requires clear network selection, transparent commissions, correct confirmations and compliance. For "instant" experience, USDT (stability of calculations) and Lightning/L2 (speed/low commissions) are optimal. Competent UX, clear transaction statuses and strict security measures make cryptocurrency deposits and conclusions predictable and convenient without compromising the speed of the game cycle.