CoinDesk Indices changed the contributing-exchange mix for seven single-asset cryptocurrency price indices at 4 p.m. Eastern Time on December 21, 2025. The scheduled quarterly reset added five venue-index relationships and removed four, affecting benchmarks for bitcoin, ether, cardano, bitcoin cash, litecoin, uniswap and zcash.
The event was market plumbing rather than a token launch, price shock or regulatory decision. Its significance came from the role benchmarks play in turning fragmented, continuously traded cryptocurrency markets into reference prices used for valuation and financial products. Changing an input venue could alter the weight assigned to trades from that exchange, although the announcement did not quantify any resulting change in an index level.
Nine changes across seven indices
Bitstamp was added to the CoinDesk Ether Price Index, or ETX. OKX joined the Cardano Price Index, while Gemini and OKX were added to the Bitcoin Cash Index. OKX also joined XBXE, the exchange variant of the CoinDesk Bitcoin Price Index.
The removals went in the opposite direction. Bitfinex was removed from the Litecoin and Zcash indices. The Uniswap Price Index lost both Crypto.com and Bitfinex. CoinDesk’s December 5 announcement listed no additions to those three indices and no deletions from the ether, cardano, bitcoin cash or bitcoin exchange-variant indices.
These were changes to price-data sources, not exchange listings or delistings of the underlying assets. Nothing in the announcement said that the affected trading venues had stopped offering the tokens. It established only whether each venue would contribute data to the specified CoinDesk index after the December 21 implementation time.
Why the ether addition carried institutional weight
ETX already extended beyond a general market indicator. It supplied the index price used for the operational valuation of ether held by Grayscale Ethereum Trust ETF and Grayscale Ethereum Mini Trust ETF. Adding Bitstamp therefore changed one component of the benchmark underlying net-asset-value calculations for two securities trading on NYSE Arca.
CoinDesk’s event-day announcement did not specify an investment-product asset total, a change in net asset value or a percentage impact attributable to Bitstamp. It would be incorrect to infer any of those figures from the venue addition alone. A multi-exchange benchmark can reduce dependence on one marketplace, but it still depends on the quality, availability and comparability of its included data.
CoinDesk’s eligible-exchange record dated December 15 placed Bitstamp, Coinbase, Kraken, Crypto.com and OKX among the venues eligible for its single-asset indices. Eligibility did not guarantee inclusion in every index. Asset-specific liquidity and selection requirements still determined which eligible venues contributed to a particular benchmark.
A benchmark revision, not a market verdict
The December 21 reset did not establish that the added exchanges offered universally superior prices or that removed venues were unsafe. CoinDesk described the exercise as a quarterly contributing-exchange review. Its announcement supplied the decisions but did not publish the underlying asset-by-asset trading-volume calculations, individual exchange weights or a before-and-after index-impact study.
That limitation matters because cryptocurrency has no consolidated tape or universal closing auction. Prices can differ across venues because of liquidity, customer access, fees, settlement arrangements and temporary dislocations. An index provider’s venue rules are consequently part of the market structure, not a neutral detail outside it.
Later filing confirmation
On December 23, 2025, the two Grayscale ether trusts filed current reports with the Securities and Exchange Commission confirming that Bitstamp had joined ETX effective December 21 after meeting the index provider’s minimum liquidity requirement. The filings listed the resulting ETX venues as Coinbase, Kraken, Crypto.com, LMAX Digital, Gemini and Bitstamp.
Those filings were later confirmation and were not available at the December 21 implementation time. They support the institutional relevance of the ether-index change without converting the broader seven-index reset into evidence of a price movement, capital flow or trading recommendation.
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