6 Best API and System Integration Services in Singapore (2026)

Most Singapore businesses already own the software they need; the pain is that it does not talk to itself. Orders sit in one tool, invoices in another, customer records in a third, and someone retypes the gaps. System and API integration firms close those gaps by wiring ERP, CRM, accounting, e-commerce, payment and logistics platforms together so data moves on its own. This list covers six firms whose own websites describe integration work, from dedicated integration specialists to larger software houses with an integration practice. Read what each one says it connects, check that your specific systems are named, and then ask for a scoped discovery conversation. We do not quote rates.

Webpuppies runs a dedicated system integration page alongside its web, mobile and AI work. The page describes API integration and custom API development, data integration and migration, connections between enterprise systems such as CRM, ERP and payment platforms, plus integration testing and validation. It also mentions modernising legacy systems, which matters when an older in-house application has no clean interface to build against. The firm frames the goal as information moving automatically across the organisation instead of being copied by hand. Its site lists an office at Suntec City and shows a 2026 copyright line. Because integration is one of many services it sells, ask who would actually lead your project and which systems that team has connected before.

Suntec City
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Inno Panda's integration page is written for owners who run several disconnected tools. It says the firm links CRMs, accounting software and other business applications so data flows without manual re-entry, and lists e-commerce platforms, payment gateways, inventory systems, reporting tools and legacy software among the things it connects. A notable stance on the page is that clients are not pushed to replace the platforms they already use; the work is to bridge them. Related offerings it lists include API development, business process automation and payment gateway integration. The contact page shows a Singapore-registered company with an office at Paya Lebar and a booking option for an initial consultation. As with any agency, ask for a named example of a comparable integration before committing.

Paya Lebar
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AppTech System publishes a dedicated API development and integrations page with a distinctly local flavour. It says it builds custom REST and GraphQL interfaces, connects tools such as payment gateways, CRMs, accounting software, e-commerce platforms and logistics systems, and handles webhooks and real-time event updates. The page also names Singapore-specific connections, including InvoiceNow over Peppol, PayNow and Singpass or Myinfo, and says it can integrate legacy systems that offer no API at all. PDPA-conscious security is listed as part of the build. Its current contact page leans toward AI workflow automation and promises a free workflow assessment, so confirm that integration projects are still a core line when you enquire. The office listed is in the Sin Ming area.

Sin Ming (Midview City)
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Xantec positions its API integration service around the accounting and business tools common among Singapore and Malaysian SMEs. Its page names Xero and AutoCount, CRM and helpdesk systems, WooCommerce and Shopify storefronts, payment gateways, the WhatsApp Business API and custom software. It says it works with REST, SOAP or XML for older systems, webhooks for event-driven sync, and device or SDK integrations, with middleware that can be monitored. The site states experience in enterprise delivery since 2006 and shows a 2026 copyright. The contact page lists a Singapore office alongside a Johor Bahru sister company, so ask which team would build and support your work. It also publishes case studies, which are worth reading before a call.

Coleman Street
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SleekDigital is a software development firm whose API integration page speaks plainly about how spreadsheet bridges fail quietly when staff change or a data field shifts. It lists typical jobs: syncing operational data to accounting, linking e-commerce to inventory and warehouse systems, passing CRM data into quoting and project tools, feeding logistics status into customer portals, WhatsApp notifications and identity-provider sign-in. Its described method includes deciding the source of truth, field-mapping workshops, error handling with retries and replay, staging tests on production-shaped data and monitoring after launch. Its contact page says it has shipped more than a hundred projects since 2017 and lists an office in Ang Mo Kio. A good fit for firms that want a documented delivery process rather than a one-off script.

Ang Mo Kio
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Fortunesoft presents API work as a core capability on a Singapore-facing services page. It describes API consulting and architecture, REST, GraphQL, SOAP and microservice-style interfaces, authentication with OAuth2 and JWT, developer portals, and exposing legacy systems through APIs. Under integration it lists system-to-system connections, third-party API links, middleware orchestration, IoT and real-time data sync. The firm says it has more than seventeen years of service and offices in India, Singapore, Australia, the United States and Kenya, with a stated emphasis on healthcare and fintech. The Singapore page shows a local phone line and a 2026 copyright, but does not print a street address, so ask where your delivery team sits. Best suited to regulated-sector projects needing API governance and security detail.

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