IBKR supports stablecoin deposits, but not only USDC, also including USDT, as it will convert USDT to USD through compliant third parties before trading.

The real growth of USDC mainly comes from:

1️⃣ Institutional funds "on-book holdings"

Listed companies

FinTech (Stripe, PayPal-like)

Bank's on-chain settlement accounts

👉 Only USDC is eligible

2️⃣ RWA / On-chain securities / T+0 settlement

DTCC

Tokenized Treasury

On-chain stocks, funds

👉 Only USDC is eligible

3️⃣ Payment & merchant systems

Shopify

Uber

Cross-border B2B

👉 Mainly USDC is eligible

4️⃣ "Legal stablecoins" after stablecoin legislation

Regulators clearly distinguish:

Payment stablecoin

Crypto-collateral stablecoin

👉 USDT is classified as "non-preferred category"

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