Stock exchange operator Nasdaq is adding yet another cryptocurrency index – this time for the world’s third-largest cryptocurrency, XRP.

Nasdaq first partnered with Brave New Coin earlier this year (February), when it added indices for bitcoin (BTC) and ether (ETH) to its global data service.

It will offer “real-time” index information for XRP starting May 1 via its  partnership with New Zealand-based blockchain data and research firm Brave New Coin.

The new stream will be available on the Nasdaq Global Index Data ServiceSM (GIDS), its consolidated data feed. The index includes data going back to 2014 and is refreshed every five minutes, Nasdaq said.

The index is calculated using a methodology that has been “independently audited” against the International Organisation of Securities Commissions (IOSCO) principles, the firm added.

For its previous announcement of BTC & ETH. A “real-time spot or reference rate” for the price of 1 bitcoin (BTC) and 1 ethereum (ETH) respectively,  quoted in USD, and “based on the most liquid ends of their markets.” The data will be refreshed at a frequency of thirty seconds.