Yellow Card
Two twenty-somethings — a Louisiana-raised American (Chris Maurice) and a self-taught Texan engineer (Justin Poiroux) — launched a crypto exchange into a continent where almost no government had decided whether crypto was legal yet, weathered Nigeria’s hostile-to-crypto Central Bank circular, became the first licensed African stablecoin operator across 20+ markets — and in May 2026 got Mastercard itself to bet on them as the cross-border-payments rail underneath the world’s biggest card network