As part of its digital transformation, the Clearing Corporation encountered several strategic and technical challenges:

Legacy Integration Complexity

• A significant portion of existing APIs were developed in an ad-hoc, undocumented manner.
• Lack of standardization, governance, and security protocols created integration overhead.

Evolving Business Demands

• Internal teams and ecosystem partners required faster onboarding, real-time automation, and seamless data access.
• The need to expose APIs externally without compromising control intensified modernization urgency.

Heightened Security & Compliance Expectations

• Regulatory bodies mandated stronger security, auditability, and standardized data-sharing practices.
• Ensuring secure communication and access control became a non-negotiable priority.

Performance & Scalability Gaps

• Existing infrastructure could not guarantee the scalability and resilience required for high-volume traffic.
• Real-time processing demands exposed architectural bottlenecks in legacy systems.

Transformation Constraints

While the modernization initiative offered clear benefits, it also presented operational hurdles:

• Lack of Institutional Knowledge: Many legacy APIs had no documentation or known ownership, making reverse engineering necessary.
• Domain Dependency: Business logic resided with client-side SMEs, leading to dependencies and delays in technical decision-making.
• Security-First Architecture: Every API and component had to meet stringent security, compliance, and auditability requirements from day one.
• Aggressive Scope: Over 30 APIs to be delivered — including 20+ net-new and 10+ refactored legacy APIs — often without complete technical specifications.

We are delivering an end-to-end APIfication solution, powered by API Gateway, designed specifically for capital market infrastructure needs — modernizing their infrastructure with an modern-high-performing API Gateway and delivering a robust set of 30+ APIs to enhance digital agility, security, and performance.

Comprehensive API Strategy & Implementation

Full API Lifecycle Management: Designing, developing, deploying, monitoring, and governing APIs with an agile, iterative approach.

Security & Compliance: Implementing robust controls including OAuth2, JWT-based auth, rate limiting, auditing, and detailed API analytics.

Governance & Best Practices: Establishing clear standards for versioning, role-based access, and lifecycle management, ensuring long-term scalability and maintainability.

Seamless Integration of Legacy APIs

API Discovery & Refactoring: Conducted detailed assessment and reverse-engineering of undocumented legacy APIs.

Non-Disruptive Migration: Implemented payload transformations and optimized routing strategies to bring over 10+ legacy APIs into production readiness — without impacting current business flows.

Development of 20+ New APIs

Business-Aligned API Design: Delivered 20+ new APIs supporting business expansion, faster ecosystem onboarding, and improved servicing for clients and intermediaries.

Future-Proof Interfaces: Designed for extensibility, version control, and alignment with evolving regulatory standards.

Agile, Collaborative Execution

Agile + DevOps Mindset: Weekly checkpoints, sprint-based delivery, and real-time feedback loops ensure faster time-to-market.

Design Thinking Workshops: Co-creating API definitions with business stakeholders to ensure usability, accuracy, and alignment with end-user goals.

Oneture is delivering a full-stack, domain-led transformation using a four-track execution model:

Track 1: API Design & Development
Agile and domain-led design of 20+ new APIs and refactoring of legacy APIs with backward compatibility.

Track 2: Platform Setup & Deployment
Complete setup and tuning of the API Gateway, including rate limiting, JWT auth, and payload transformations.

Track 3: DevOps & Monitoring
Implemented CI/CD pipelines, Prometheus-based monitoring, and Grafana dashboards to ensure uptime, performance, and traceability.

Track 4: Governance & Best Practices
Introduced API governance policies, including versioning, role-based access control, and lifecycle tracking aligned to capital market regulations.

Key Deliverables

Fully operational API Gateway with security and observability configured20+ new APIs developed and deployed.

20+ new APIs developed, tested, and deployed.

10+ legacy APIs reverse-engineered, refactored, and migrated.

CI/CD pipelines, monitoring stack, and payload transformation framework implemented.

Comprehensive Swagger (OpenAPI 3.0) documentation and automated test results delivered.

System Architecture:

The diagram illustrates the architecture of the Clearing Corporation (CC) APIfication Account, designed to expose core functionalities through a secure, scalable API-based ecosystem.

Key Components:

1. Member (Client/User)
The external consumer (e.g., broker, clearing member, Depositories) initiates API requests to interact with CC services.

2. API Gateway
Acts as the single-entry point for all external API calls. It performs:

• Authentication and authorization routing
• Request validation and transformation
• Rate limiting and logging
• Routing requests to the appropriate backend microservice

3. Auth Microservice

• Manages user authentication (e.g., JWT, OAuth2-based, RSA Based signature verification)
• Interfaces with its own MySQL database
• Ensures secure access to downstream services

4. Microservice 1, 2, N

• Each microservice encapsulates a specific business function (e.g., transactions, pledging, margin, etc.)
• Independently deployed and scalable
• Each service has its own dedicated MySQL datastore
• Some services interact with the CC Core System to complete business workflows

5. CC Core System

• The backend enterprise system (e.g., mainframe or legacy application) that holds authoritative data and processes
• Microservices call into this system as needed for processing or data access

6. Grafana

• Connected to the API Gateway and microservices for observability
• Visualizes system health, request metrics, and performance dashboards

Benefits of this Architecture:

• Modular: Each business capability is isolated in its own microservice.
• Scalable: Services can scale independently based on load.
• Secure: Centralized auth and rate-limiting ensure robust access control.
• Observable: Monitoring via Grafana enables proactive system management.
• API-First: Enables faster partner onboarding and digital integration.

• API Gateway: Modern High Performance Gateway
• Development Stack: Go, Node.js, Python (as per API needs)
• Monitoring: Grafana, Prometheus
• Testing: Postman, JMeter

30+ APIs: 20+ new APIs being designed and developed, 10+ legacy APIs being migrated and optimized.

Secure Gateway: Full implementation of API Gateway with security and observability being built.

Faster Time-to-Market: Agile execution with iterative development, regular checkpoints, and client co-creation.

Foundation for Innovation: A scalable, modern API infrastructure enabling rapid innovation, new integrations, and business models.

With this modern API architecture, the Clearing Corporation will be well-positioned to:

• Rapidly onboard new partners
• Offer differentiated digital clearing services
• Ensure security, compliance, and performance at scale
• Lay a strong foundation for future innovation