Interactive Brokers’ stablecoin funding rail now runs in both directions, and the choice of which coins ride it says more about compliance posture than crypto ambition. The three stablecoins Interactive Brokers LLC accepts — USDC, PayPal USD (PYUSD) and Ripple USD (RLUSD) — command a combined $78.7 billion of circulating supply, according to DefiLlama data on August 26, 2026. Tether (USDT), which the rail does not touch, sits at $183.2 billion on its own. The coin Interactive Brokers left out is 2.3 times larger than everything it plumbed in.
That omission is the tell. This is not a listings decision, it is a payments decision. Interactive Brokers has offered crypto trading since 2021; what changed this year is that stablecoin became a way to move client money on and off the platform — a funding rail inside a broker-dealer’s cash management, answerable to client-money handling rather than to a listings committee.
Three coins, three chains, one entity
On July 14, 2026, Interactive Brokers said clients could withdraw USD from an IBKR account via automatic conversion to USDC, PYUSD or RLUSD and push it to external wallets, completing a loop that opened on the deposit side on January 15, 2026. The same announcement added nine tradable tokens through zerohash — Aave, Aptos, Canton, Lido DAO, Monad, NEAR Protocol, Plasma, Pax Gold and Uniswap — plus three through Paxos Trust Company. Those are two separate products that coverage has tended to blur.
The operational detail is where a B2B reader should look. Per the stablecoin deposit page, a client sends coin to a wallet address generated by zerohash on one of three networks — Ethereum, Solana or Base — and it is converted to US dollars on receipt and credited as cash. Interactive Brokers never holds the stablecoin: no broker custody of the asset, no balance denominated in it. The firm’s own disclosure is blunt — stablecoins “may lose value, de-peg from the U.S. dollar” and “are not insured.”
Two further constraints are easy to miss. The offer is scoped to a single entity — Interactive Brokers LLC — not to a country. IBKR’s UK, Irish and Hong Kong entities are named in neither announcement, so eligibility follows which entity carries the account rather than where the client sits. And the pricing has quietly moved. January’s release put zerohash’s conversion fee at a flat 0.30% with a $1 minimum; the live page now shows a tiered schedule of 0.35% on the first $5,000, 0.20% on the next $15,000 and 0.10% above $20,000. A $1,000 deposit therefore rises from $3.00 to $3.50, while a $100,000 deposit falls from $300 to $127.50 — a 57.5% cut. The rail was repriced for size, which is what you do to a rail you expect institutions to use.
The vendor the broker part-owns
“We believe digital assets should be integrated into a client’s broader financial experience, not treated separately,” said Milan Galik, Chief Executive Officer of Interactive Brokers, in the July announcement. In January he framed it purely as a cross-border cost fix.
The unusual part is the counterparty. Interactive Brokers does not merely use zerohash, which it appointed as its crypto trading and custody provider in 2023 — it led the firm’s $104 million round in September 2025 at a $1 billion valuation, alongside Morgan Stanley, Apollo and SoFi. The broker is a shareholder in its own settlement rail. Zerohash has since secured trust company approval and a Dutch AFM licence covering the European Economic Area, and reportedly rebuffed a Mastercard approach; Mastercard’s latest 10-Q books the $1.5 billion BVNK purchase instead.
Nor was Interactive Brokers first: tastytrade shipped stablecoin account funding in July 2025, six months earlier, on the same vendor. The sharper contrast is with the broker’s own stated plan. This site reported in July 2025 that Interactive Brokers was weighing a proprietary stablecoin. It did the opposite — outsourcing issuance entirely, keeping only the rail.
Which brings the argument back to Tether. All three supported coins are issued under US supervision: Circle, Paxos for PYUSD, and Ripple’s NYDFS-approved RLUSD. A broker-dealer moving client cash cannot easily accept an issuer whose standing under the GENIUS Act’s treatment of foreign issuers is unresolved. The $183.2 billion exclusion is not a market call; it is a permitted-payments list.
One loose end is worth watching. As of August 26, 2026, six weeks after the bidirectional launch, the broker’s deposit page still lists USDC as the only live deposit coin, with RLUSD and PYUSD expected “in the coming weeks.” Stale page or real asymmetry between deposits and withdrawals, that gap matters to anyone reconciling flows. The clearer signal will be zerohash’s EEA licence: if Interactive Brokers’ European and UK entities get the same rail, this stops being a US broker-dealer experiment and becomes a multi-entity funding standard.
This article is informational analysis only and is not financial, investment, or trading advice. Cryptocurrencies are highly volatile and can lose substantial value rapidly. Past performance and historical patterns do not guarantee future results. Do your own research and consult a regulated financial adviser before making any investment decision.
Karthik Subramanian
Karthik Subramanian is a founder, writer, and technology consultant with nine years in the crypto ecosystem. He covers token economics, L1/L2 infrastructure, DeFi protocols, wallets/custody, and the bridge between crypto and forex—broker technology, liquidity, and macro drivers. Karthik’s writing focuses on clear, practical frameworks that help professionals evaluate new products and on-chain innovation alongside FX market realities.
