TransferWise has bunq in the trunk.

International money transfer specialist has a new partner in Dutch challenger bank bunq, which announced today that it is integrating with TransferWise’s API to enable its customers to send money in up to 15 different currencies directly from the bunq app.

“Our mission is to free our users from borders and barriers in traditional banking, such as hidden fees,” bunq CEO Ali Niknam said. “We think TransferWise is a valuable addition to solidify that mission.” Founded in 2015, bunq is headquartered in Amsterdam, Netherlands.

Bunq users will also benefit from access to real exchange rates, TransferWise’s transparent and competitive fees, and fast transfer speeds – the latter courtesy of the instant SEPA payment system that shortens the time it takes EUR to GBR transfers, for example, from days to minutes. “In the future,” TransferWise noted in a blog post announcing the partnership news, “it should only take a few seconds.”

bunq is the second challenger bank that TransferWise has teamed up with this year. In June, the company partnered with Monzo, powering international money transfers for the digital bank’s 750,000 customers. And just weeks before announcing the Monzo partnership, TransferWise reported that it was working with Groupe BPCE, providing money transfer services to the French banking group’s 15 million retail customers.

TransferWise demonstrated its technology at FinovateEurope 2013. Earlier this fall, the company announced its second profitable year and annual revenue growth of 75%. This summer, TransferWise announced the opening of an office in Hong Kong as part of its expansion into Asia. With more than $396 million in funding, TransferWise is one of fintech’s “unicorns” with a valuation in excess of $1.6 billion. The company has more than three million users, and facilitates the transfer of more than $2.65 billion a month. TransferWise was founded by Taavet Hinrikus and Kristo Kaarmann (CEO) in 2011.

Foreign currency exchange platform TransferWise just landed a new partnership with challenger bank Monzo. This agreement marks the fintech’s first U.K. bank client to go live and comes just weeks after the company announced a similar partnership with France’s BPCE Group.

Through today’s agreement, TransferWise will power international money transfers for Monzo’s 750,000 users. Starting today, Monzo has integrated with TransferWise’s API to allow its users to send money from their Monzo checking account in 16 currencies. The bank is working to add more currencies in the near future.

Monzo opted to leverage TransferWise for international money transfers because of the positive user experience co-founder Tom Blomfield has had with TransferWise in the past. Blomfield told TechCrunch in an interview, “I’ve personally been a TransferWise customer for five or six years and the service is amazing. Compared to my old bank, it’s really, really transparent, the fees are really fair, and they’re continually working on bringing fees down and to make transfers more instantaneous. So I can’t think of a better partner to do foreign transfers with than TransferWise.”

Many Monzo clients already use TransferWise, but for those who do not, TransferWise will automatically set up an account for them when they initiate their first bank transfer. For all users, the international transfers will be syndicated across both their Monzo and TransferWise accounts.

With more than 3 million users, TransferWise facilitates the movement of more than $2.65 billion each month. Today’s partnership marks TransferWise’s first U.K. bank client to go live, adding to the fintech’s other bank partnerships, including N26 and LHV. TransferWise had– at one point– announced an integration with Starling Bank in the U.K., but the partnership was never finalized and fell through.

TransferWise does not charge users to sign up and there are no monthly fees. By leveraging the ability to transfer money within its network of banks, the company makes sending money abroad up to 7x cheaper than using a bank account. The company was founded in 2010 and showcased its P2P currency exchange services at FinovateEurope 2013. TransferWise recently launched in Argentina to allow Argentinians to move money to and from more than 60 countries.