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Brazil's Open Finance is the world's largest. 100M+ customers, 5B+ weekly API calls. But the docs for developers are dense, fragmented, and take weeks to untangle. The Open Finance Playground is an open-source set of step-by-step implementation guides with a live simulator showing every API call behind each UX flow, consent, payment initiation, data access. Built by Juspay (global payments technology company powering 300M+ transactions per day) and Cumbuca (licensed Payment Institution)
I'm Bruno from Cumbuca. We're a Payment Institution authorized by Brazil's Central Bank, and we've been implementing Open Finance since the beginning of the ecosystem.
Here's the problem we kept running into: Brazil's Open Finance is the largest in the world, but the official documentation was built to describe what the system requires, not to teach how to build on it. Every company entering the ecosystem spends weeks on what we call "technical archaeology" — figuring out undocumented requirements, bank-specific quirks, and security details that aren't in the specs.
We partnered with Juspay, who built Open Finance integrations end-to-end in Brazil and was pivotal in the rise of UPI in India. Together, we started documenting everything we learned. What began as internal notes became a structured guide. When we realized the pain was universal, we open-sourced it. What began as internal notes became a structured guide. When we realized the pain was universal, we open-sourced it.
The Playground includes:
Implementation guides — step-by-step, organized by flow (consent, payment initiation, data access) Live simulator — see every API call behind each step of the UX Bank-specific quirks — the things you only learn after months of implementation It complements the official documentation — it doesn't replace it. Think of it as the "getting started guide" that every complex technical ecosystem needs.
What's the hardest part of integrating with Open Finance for you? If you've built on Open Finance, what surprised you most about the implementation? For developers outside Brazil — does your country's Open Banking/Finance have good dev docs?
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About Open Finance Playground on Product Hunt
“Open-source dev guide for Brazil's Open Finance”
Open Finance Playground was submitted on Product Hunt and earned 7 upvotes and 1 comments, placing #108 on the daily leaderboard. Brazil's Open Finance is the world's largest. 100M+ customers, 5B+ weekly API calls. But the docs for developers are dense, fragmented, and take weeks to untangle. The Open Finance Playground is an open-source set of step-by-step implementation guides with a live simulator showing every API call behind each UX flow, consent, payment initiation, data access. Built by Juspay (global payments technology company powering 300M+ transactions per day) and Cumbuca (licensed Payment Institution)
Open Finance Playground was featured in Open Source (68.4k followers), Fintech (46.9k followers), Developer Tools (512.1k followers) and GitHub (41.2k followers) on Product Hunt. Together, these topics include over 115.2k products, making this a competitive space to launch in.
Who hunted Open Finance Playground?
Open Finance Playground was hunted by Bruno Cury. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Bruno Cury
Hey Product Hunt 👋
I'm Bruno from Cumbuca. We're a Payment Institution authorized by Brazil's Central Bank, and we've been implementing Open Finance since the beginning of the ecosystem.
Here's the problem we kept running into: Brazil's Open Finance is the largest in the world, but the official documentation was built to describe what the system requires, not to teach how to build on it. Every company entering the ecosystem spends weeks on what we call "technical archaeology" — figuring out undocumented requirements, bank-specific quirks, and security details that aren't in the specs.
We partnered with Juspay, who built Open Finance integrations end-to-end in Brazil and was pivotal in the rise of UPI in India. Together, we started documenting everything we learned. What began as internal notes became a structured guide. When we realized the pain was universal, we open-sourced it. What began as internal notes became a structured guide. When we realized the pain was universal, we open-sourced it.
The Playground includes:
Implementation guides — step-by-step, organized by flow (consent, payment initiation, data access)
Live simulator — see every API call behind each step of the UX
Bank-specific quirks — the things you only learn after months of implementation
It complements the official documentation — it doesn't replace it. Think of it as the "getting started guide" that every complex technical ecosystem needs.
🔗 Documentation: juspay-2.gitbook.io/open-finance/pt
🔗 GitHub: github.com/juspay/open-finance
🔗 Simulator: juspay.io/open-finance/mobileViewContainer
We'd love to hear from you:
What's the hardest part of integrating with Open Finance for you?
If you've built on Open Finance, what surprised you most about the implementation?
For developers outside Brazil — does your country's Open Banking/Finance have good dev docs?