      API sponsorship program
    

Get US$20,000 in credits to build your next financial software product.

Connect to 10+ banks in Vietnam through one Open API platform. Choose the APIs you need to automate cash flow and reconcile transactions in real time.

Free, with no commitments Response within 48 hours

cas.so - demo LIVE

$20,000

Sponsored API Credit

Real-time cash flow Live

+2,500,000 VND

VietinBank · webhook 84ms

+850,000 VND

MB Bank · webhook 71ms

+1,200,000 VND

ACB · webhook 79ms

Connect directly to 10+ major banks in Vietnam

01 - The challenge

Building bank integrations takes 3–6 months and substantial investment

Negotiate and integrate manually with each individual bank

Complex legal requirements for direct connectivity approval

High engineering costs to maintain each connection

Go-live delayed by 3–6 months due to dependencies on bank infrastructure

The Cas solution

One API, every bank — connected in just days

Connect to 10+ banks through a single integrationIntegrate once and access all banks, with no separate negotiations.

Reconcile cash flow in real timeWebhooks run in under 100 ms, with no manual polling.

Standardized documentation and a ready-to-use sandboxRead the docs at cas.so/intro — integrate and test the same day.

1,000+

Businesses

10+

Banks

<100ms

Webhook

ISO 27001

Security

02 - Program benefits

More than credits: an ecosystem to help you grow

US$20,000 credit fund

Cover API calls, webhooks and financial gateway connectivity, without upfront costs, across the entire Cas platform.

Full access to every API

Balance Hook, Virtual Account, QR Pay, Pay Out, eKYC and more, with no endpoint restrictions.

Documentation and sandbox ready to use

Standardized documentation and a public sandbox let developers integrate immediately, with no approval delays.

One-to-one support from Cas engineers

Technical experts advise on API architecture, handle webhooks and help your system run smoothly from sandbox to production.

03 - Official sponsorship package

US$20,000 in API credits

Receive an account worth 20,000 USD to use any Cas API. Every startup, at every stage, deserves the right Open Banking technology.

Cas for Startup

$20,000

API Credit Valid for 12 months

US$20,000 in creditsUse across the API platform for payments, reconciliation and eKYC.

Full API accessNo endpoint restrictions. Build your product your way.

10+ BanksVietinBank, MB, OCB, ACB, BIDV and more through one gateway.

One-to-one engineering supportSupport for integration, webhooks and on-time go-live.

Sandbox and documentationA testing environment ready to use at cas.so/intro.

ISO 27001 securityInfrastructure meeting the ISO/IEC 27001:2022 international standard.

Your journey with Cas

From registration to go-live in four steps

Explore the technical documentation

Visit cas.so/intro, read the documentation and learn how Cas APIs work.

Register and verify

Complete the form and describe your financial software project so the review team can assess a suitable sponsorship package.

Integrate Cas APIs

Use any Cas endpoint to connect bank data flows directly to your application.

Receive credits and go live

Activate credits from the US$20,000 fund, launch your software and grow.

04 - Customers

Trusted by established financial technology businesses in Vietnam

Sponsored startups

Startups supported with Cas credits

View all

05 - Eligibility

Who can join Cas for Startup?

Businesses registered in VietnamRegistered businesses planning to develop a technology product.

Need Open API integrationBuilding financial software or looking to automate cash flow.

Ready to implementExplore and use the platform documentation at cas.so/intro.

Suitable for every stageFrom MVP through growth and scale-up, Cas is ready to support you.

Registration process

Three steps to API credits

Complete the form. The Cas team will verify your details and issue an API key within 48 business hours.

Complete the project information formTell us about your product and APIs of interest. It only takes three minutes.

Cas engineers contact you for verificationWithin 48 business hours, the team will clarify your needs and confirm your details.

Activate credits and your API keyReceive US$20,000 in credits and your production API key, then start building.

Registration complete!

Thank you. Cas engineers will contact you by email within 48 business hours to verify and activate your sponsorship.

FAQ

Frequently asked questions

What is Cas for Startup?+

The program provides up to US$20,000 in sponsored credits and comprehensive technical support, helping businesses access Cas banking Open APIs to build innovative financial software.

Do I have to use any other Cas software?+

No. The program is independent and focuses entirely on providing Open APIs for startups to build their own software, with no requirement to use any other product.

Where can I find the technical documentation?+

All integration guides and API endpoints are publicly available at cas.so/intro, including a sandbox, code examples and a complete launch checklist.

What can I use the US$20,000 in credits for?+

Use them for any Cas API: Balance Hook, Virtual Account, QR Pay, Transactions, Pay Out, eKYC, Invoice Hub, TVAN and more, covering your Open Banking connectivity needs.

Which startup stages are eligible?+

Every stage is welcome, from early-stage MVP development and growth-stage expansion to funded scale-ups. Credits are assessed according to the project’s actual needs.