Coinbase International Exchange will go offline for up to one hour on October 1, 2026, as the company executes a planned migration of its institutional derivatives clients onto Deribit, the crypto options venue it acquired for approximately $2.9 billion in August 2025.

The downtime begins at 09:00 UTC. During the window, Coinbase will transfer accounts, portfolios, balances, and open positions from the International Exchange infrastructure onto newly provisioned subaccounts on Deribit, completing the integration of the acquisition and consolidating institutional derivatives trading onto a single platform.

A hard cutover, not a soft handoff

Coinbase describes the move as a "hard migration." All open orders on the International Exchange will be canceled outright. Existing positions will be settled at the International Exchange mark price, then recreated on Deribit through matched "Migration" block trades executed at those same prices. Clients keep their economic exposure; the order book, however, starts from zero.

That distinction carries real operational weight for institutional desks. Any firm running complex multi-leg strategies or resting limit orders on the book will need to reconstruct those orders manually once the cutover completes. Positions survive the migration; the working orders around them do not.

The API layer breaks too. Existing International Exchange API keys will not function on Deribit. Trading firms that rely on algorithmic execution must generate new keys and reconfigure their connections before the switch — a non-trivial task for desks with bespoke infrastructure, risk controls, and routing logic built around the old endpoints.

Coinbase has tried to compress that reintegration burden. Read-only access to the new Deribit accounts opened on September 22, giving clients roughly nine days to inspect balances, create API keys, and map portfolios ahead of the cutover. The company also extended the estimated downtime from an initial 30 minutes to a full hour, an acknowledgment that the transfer of open positions and balances across matched block trades may take longer than first projected.

Why Deribit is the surviving venue

The consolidation resolves a question that has hung over the combined group since the acquisition closed: which platform carries the institutional derivatives franchise. The on-chain and venue data answer it decisively.

As of early September 2026, Deribit held approximately $39.26 billion in derivatives open interest across the Coinbase group. Combined group open interest stood at roughly $40.65 billion, meaning Deribit was already carrying 96.6% of the total before a single International Exchange account had moved over. The migration formalizes an outcome that market share had effectively decided.

The $2.9 billion purchase, completed in August 2025, brought Coinbase a venue that was already dominant in crypto options trading, particularly in Bitcoin and Ethereum derivatives where institutional hedging volume concentrates. Folding the International Exchange into Deribit gives the group one margining structure, one order book, and one set of API endpoints to maintain, rather than two parallel institutional venues competing for the same flow.

What clients must do

For institutional clients, the practical deadline is now. Anyone who has not yet logged into their provisioned Deribit account to verify balances and set up new API keys has a shrinking window before October 1. After the cutover, the reconstruction of canceled orders happens manually — a process that could leave desks temporarily under-hedged if positions and hedges do not carry over symmetrically.

Retail Coinbase users face a lighter lift. The company has indicated the retail transition will be largely automatic, requiring little to no direct action from individual account holders.

The migration marks the final structural step in Coinbase's derivatives consolidation. Once the October 1 cutover completes and desks have rebuilt their order flow on Deribit's infrastructure, attention shifts to whether the combined venue can deepen liquidity in listed crypto options — and whether the merged platform's risk and margining framework holds up under the concentrated open interest it will now carry.