The Stablecoin Rulebook Lands Next Month, and Yield Is Out

The first real US stablecoin rules are almost here. Regulators must finalize the framework under the GENIUS Act by July 18, and the latest bill text bans paying interest on idle stablecoin balances while still allowing rewards tied to actual transactions. For Circle and Coinbase, the difference is worth billions.

This is the rulebook crypto has waited years for. A 309-page Senate Banking bill sets the terms, prohibiting yield on stablecoins that just sit in a wallet, while permitting activity-based rewards for coins used in real transactions, lending or market-making. It also sketches a framework for DeFi trading and an insolvency safe harbor, the kind of detail that turns stablecoins from a gray area into regulated finance.

The line on yield is the fight. Platforms like Coinbase had hoped to pay customers interest on stablecoin balances, a feature that drives deposits and competes with banks. Banning passive yield protects the banking system from deposit flight, but it takes away one of the most powerful tools exchanges had to attract idle cash. Circle and Coinbase, which share the USDC business, sit right in the middle of it.

The stakes for those two are direct. When an earlier draft threatened stablecoin rewards in March, Circle posted its worst day on record, a reminder of how tightly its value is tied to the rules. The final language allowing transaction-based rewards softens the blow, since it leaves room to pay users for actually using the coin rather than just holding it. The model shifts from passive yield to usage.

The structure goes beyond stablecoins. The same legislative push would put Bitcoin and Ethereum primarily under the CFTC as commodities, while leaving securities-like tokens with the SEC, finally drawing the jurisdictional line the industry has fought over for years. Clear rules cut both ways, removing legal risk while closing off some of the lucrative gray-zone products.

So the July 18 deadline turns a long debate into law, and the headline is that passive stablecoin yield is going away. A finished framework, a clearer split between the SEC and CFTC, and a direct hit to one business model with a softer landing through usage rewards. Clarity is arriving, on the regulators' terms. Watch July 18 and how Circle and Coinbase adapt.