https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Mon, 25 May 2026 00:00:00 GMT https://www.youngju.dev/blog/culture/2026-05-25-baas-api-banking-solaris-synapse-treasury-prime-unit-galileo-marqeta-stripe-treasury-2026-deep-dive.en https://www.youngju.dev/blog/culture/2026-05-25-baas-api-banking-solaris-synapse-treasury-prime-unit-galileo-marqeta-stripe-treasury-2026-deep-dive.en Banking in 2026 is no longer the industry of branches and passbooks. BaaS (Banking-as-a-Service) layers middleware and fintech apps on top of a sponsor bank license, exposing payments, deposits, cards, and transfers as APIs. In the US, the Synapse 2024 bankruptcy exposed `$300M missing customer funds`, triggering a wave of Fed/OCC consent orders that hardened sponsor bank governance. Treasury Prime, Unit, Galileo, Marqeta, Stripe Treasury, and Adyen for Platforms redefined the market. In Europe, Solaris (formerly Solarisbank) recovered its license, combining e-money plus banking. In Korea, Finnq, Toss BaaS, and Kakaobank's 50+ APIs went into full production. In Japan, GMO Aozora Net Bank, BANKING.JP, Sumishin SBI Net Bank, J-coin Pay, and Setou Bank Embedded shaped a JPY-integrated API. This article walks through BaaS architecture, sponsor banks, middleware, regulatory scrutiny, the `$300B+` embedded finance market, Marqeta's `$200B+ TPV`, Galileo's `$50M+ accounts`, and the KR/JP models in one breath. Mon, 25 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) baasbanking-as-a-servicesolaris-banksynapse-bankruptcytreasury-primeunitgalileo-sofimarqetastripe-treasuryadyen-for-platformsfinc-koreatoss-baaskakaobank-baasgmo-aozora-baasembedded-finance https://www.youngju.dev/blog/culture/2026-05-25-baas-api-banking-solaris-synapse-treasury-prime-unit-galileo-marqeta-stripe-treasury-2026-deep-dive.ja https://www.youngju.dev/blog/culture/2026-05-25-baas-api-banking-solaris-synapse-treasury-prime-unit-galileo-marqeta-stripe-treasury-2026-deep-dive.ja 2026年の銀行業はもう支店と通帳の産業ではない。BaaS(Banking-as-a-Service)はスポンサー銀行のライセンスの上にミドルウェアとフィンテックアプリを重ね、決済・預金・カード・送金を API として公開する。米国では Synapse の 2024 年破綻で `$300M missing customer funds` 事件が露呈し、Fed/OCC の consent order が相次いでスポンサー銀行のガバナンスが強化された。その間に Treasury Prime・Unit・Galileo・Marqeta・Stripe Treasury・Adyen for Platforms が市場を再定義し、欧州では Solaris(旧 Solarisbank)がライセンス回復後に e-money + Banking 統合ライセンスを整備した。韓国ではフィンク(핀크)の BaaS、Toss BaaS、カカオバンクの 50 以上の API が本格化し、日本では GMO あおぞらネット銀行・BANKING.JP・住信 SBI ネット銀行・J-Coin Pay・Setou Bank Embedded が JPY 統合 API を加速する。本稿は BaaS アーキテクチャ、スポンサー銀行、ミドルウェア、規制強化、組込み金融 `$300B+` 市場、Marqeta `$200B+ TPV`、Galileo の `$50M+ accounts`、KR/JP モデルまでを一気に整理する。 Mon, 25 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) baasbanking-as-a-servicesolaris-banksynapse-bankruptcytreasury-primeunitgalileo-sofimarqetastripe-treasuryadyen-for-platformsfinc-koreatoss-baaskakaobank-baasgmo-aozora-baasembedded-finance https://www.youngju.dev/blog/culture/2026-05-25-baas-api-banking-solaris-synapse-treasury-prime-unit-galileo-marqeta-stripe-treasury-2026-deep-dive https://www.youngju.dev/blog/culture/2026-05-25-baas-api-banking-solaris-synapse-treasury-prime-unit-galileo-marqeta-stripe-treasury-2026-deep-dive 2026년의 은행은 더 이상 지점과 통장의 산업이 아니다. BaaS(Banking-as-a-Service)는 sponsor bank 라이센스 위에 middleware와 fintech app을 올려 결제·예금·카드·송금을 API로 노출한다. 미국에서는 Synapse 2024년 파산으로 `$300M missing customer funds` 사건이 터졌고, Fed/OCC가 잇따라 consent order를 내리면서 sponsor bank 거버넌스가 강화됐다. 그 사이에 Treasury Prime·Unit·Galileo·Marqeta·Stripe Treasury·Adyen for Platforms가 시장을 재정의했고, 유럽에서는 Solaris(전 Solarisbank)가 라이센스 회복 후 e-money + Banking 합산 라이센스를 정비했다. 한국에서는 핀크의 BaaS, 토스 BaaS, 카카오뱅크의 50개+ API가 본격화됐고, 일본에서는 GMO Aozora Net Bank·BANKING.JP·住信SBI·J-coin·Setou Bank Embedded가 JPY 통합 API를 가속한다. 이 글은 BaaS 아키텍처, sponsor bank, middleware, regulatory scrutiny, embedded finance `$300B+` 시장, Marqeta `$200B+ TPV`, Galileo의 `$50M+ accounts`, KR/JP 모델까지 한 호흡으로 정리한다. Mon, 25 May 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) baasbanking-as-a-servicesolaris-banksynapse-bankruptcytreasury-primeunitgalileo-sofimarqetastripe-treasuryadyen-for-platformsfinc-koreatoss-baaskakaobank-baasgmo-aozora-baasembedded-finance