What is API Banking?
API Banking enables businesses to include banking services - you name it: fund transfers, real-time reconciliation, and account visibility - within their own applications through secure, developer-friendly banking APIs.
Whether you are an NBFC issuing loans, a marketplace streamlining vendor payments, or a fintech expanding digital payments, Castler's high-scale API banking platform puts you in full control of 15+ connected banks - through one API stack.
Why is API Banking the Future?
One API. 15+ Bank Integrations. Zero Complexity –
Castler bridges your business with India's leading banks through a multi-bank API integration platform - supported by enhanced compliance and designed for new-age workflows.
Compliant by Design – Castler is PCI DSS, ISO 27001, and SOC-2 compliant, which means your API-based current accounts and digital transactions are of the highest regulatory standard.
Faster Time to Market – Launch use cases in days through our sandbox for banking API integration and go live with bulk disbursements, UPI collections, or automated escrow flows.
Open and manage corporate banking APIs for current accounts instantly
Automate balance fetch, funds transfer, and payee verification
Integrate NEFT, RTGS, IMPS and UPI APIs
Enable bulk payouts and mandate-based collections using eNACH API
Fetch bank statements through real-time reconciliation APIs
Track transactions, create digital challans, and achieve audit readiness
Enforce maker-checker API workflows with full audit trails
Manage access with role-based permissions for finance, ops, and compliance teams
Access Castler's RESTful API documentation and sandbox
Pre-integrated with ERPs, LMS, CRMs, and payment systems
API Banking for NBFCs & Lenders
Automate disbursements of loans, authenticate borrowers, and settle repayments in real time
API Banking for Fintechs
Launch compliant payment flows and real-time settlement APIs
API Banking for Marketplaces & Aggregators
Process payouts, commissions, and vendor KYC with a scalable, white-labeled API solution
Escrow & Trust Account APIs
Design and operate digital escrow frameworks with RERA escrow API solutions and trust account APIs
PSU & Government Projects
Implement compliant transaction banking APIs with complete visibility and approval controls
PCI DSS, ISO 27001, SOC-2
15+ Partner Banks
99.99% API Uptime
5 Million+ Monthly API Calls
1000+ Enterprise Clients
₹15,000+ Cr in EUM