Marcin P. was detained on 19 May near Chicago, where he had been living for several months.
Interpol issued a Red Notice against him in October 2025, by which point Polish prosecutors had already charged him in absentia.
He is accused of defrauding more than 7,000 customers, money laundering and breaching Poland's payment services law.
Estimated losses stand at PLN 185 million (EUR 43.6 million).
He faces up to 25 years in prison.
Cinkciarz.pl, founded in 2007, was once one of Poland's most prominent fintech companies and sponsored both the Polish national football team and the NBA's Chicago Bulls.
A bankruptcy petition was filed in March 2025 and approved by the court in October.
The Money.pl report also draws a connection to a separate financial scandal involving cryptocurrency exchange Zondacrypto.
Its report notes that the PR firm Fiverand, in which Konfederacja MP Przemysław Wipler was a general partner until December 2023, received payments totalling PLN 350,000 (EUR 82,460) from two companies linked to Marcin P.
Wipler has denied any personal involvement.
"I have never provided services for Cinkciarz – not personally, nor through any legal entity in which I held a role," he said.
The far-right MP added that Fiverand's lease of his parliamentary office had ended in October 2023, and that he was not responsible for when the firm updated its company registry records after his departure.
The MP's foundation, Dobry Rząd, previously came under scrutiny after Prime Minister Donald Tusk revealed in April that it had received EUR 70,000 from a company linked to the head of Zondacrypto, Przemysław Kral.
Wipler said those funds were payment for analytical work unrelated to ongoing crypto legislation.
(ał)
Source: PAP, Money.pl