API Integration Services for Financial Systems
An API integration connects your system to external venues and services so that data and operations flow without manual intervention. We build connectors to exchanges, brokers, banks, payment systems, CRM platforms and market data vendors, normalise their data into a single model and make the exchange observable: you can see what works, what lags and what broke.
What it solves
- Eliminate manual data transfer between systems and the errors that come with it.
- Add a new venue or payment channel without reworking business logic.
- Normalise data from different sources into one model — accounts, instruments, transactions.
- Make failures visible: it is clear which integration degraded and what it affected.
- Remove single-vendor dependency: a fallback channel takes over without stopping the business.
What the solution includes
Connectors
Connectivity over REST, WebSocket, FIX protocol and webhooks, accounting for rate limits, authentication and each venue's quirks.
Data normalisation
A unified reference model of instruments, accounts and transaction statuses on top of heterogeneous external formats.
Reliable delivery
Queues, retries, idempotency and duplicate protection across failures and reconnects.
Integration monitoring
Latency and error metrics, health checks and alerting when a specific channel degrades.
Your own public API
Design, build and documentation of your outward-facing API for partners and client applications.
Exchange security
Keys stored off the client, secret rotation, request signing and least-privilege scoping of integration credentials.
Architecture and technical requirements
- Venue isolation
- Each connector is a separate component: a failure or API change at one venue does not affect the others.
- Rate limits and backoff
- Respect for rate limits, exponential retries and prioritisation of critical requests over background synchronisation.
- Consistency
- Scheduled state reconciliation against the external system: discrepancies are found before a client notices them.
- Observability
- An end-to-end operation identifier across all systems, structured logs and traces for incident analysis.
- Versioning
- External API changes pass through an adapter layer, so an upgrade requires no edits to business logic.
What we integrate with
- Exchanges and trading venues, including crypto exchanges
- Brokers and liquidity providers, FIX protocol connectivity
- Banks, card acquiring and payment systems
- Market data and reference data vendors
- CRM, support desks and messaging services
- Accounting and analytics systems, data warehouses
Stages and timelines
- 01
Audit — 1 week
Review of the venue's documentation, constraints, credentials and test environment.
- 02
Connector prototype — 1–2 weeks
Connection to the test environment, validation of key workflows and real latency.
- 03
Production integration — 3–6 weeks
Error handling, retries, reconciliation, monitoring and rollout to production.
- 04
Maintenance — continuous
Tracking external API changes and keeping compatibility intact.
Frequently asked questions
How long does it take to connect one exchange?
A prototype with trading operations takes one to two weeks. A production integration with error handling, reconciliation and monitoring takes three to six weeks, depending on the quality of the venue's documentation and how complete its test environment is.
What if the external API changes?
Connectors are isolated behind adapters, so a change touches a single component. Under a maintenance agreement we track venue announcements and update the connector before the old version is switched off.
Who stores the venue API keys?
Keys are held on the backend in a secure store and never reach the client application or the repository. Integration credentials are scoped to the minimum permissions required.
Can you deliver an integration without building the whole system?
Yes, integrations are a standalone service. We connect to your existing system, agree the exchange contract and hand over a finished connector with documentation and monitoring.
Related solutions
- Trading terminalsDesktop, web and mobile trading front ends: market data, order book, order entry, positions and risk control.
- Brokerage platformsClient portal, onboarding, accounts, transaction accounting, commissions, IB programmes and broker admin panel.
- Risk management systemsReal-time control of positions, limits, drawdown and margin with automatic actions and alerting.
Get a proposal for your project
Tell us which system you need built or which process you need automated. We will study the task, clarify the requirements and prepare a preliminary commercial proposal.