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FIG 01 · API Integration

API integration services that keep your systems in sync

Connect your CRM, payments, ERP, ecommerce and AI tools with integrations engineered like products: typed, monitored, documented and yours.

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See how it works
Engineer drawing an API integration diagram of connected systems on a glass whiteboard

FIG 02 · Quick answer

What are API integration services?

API integration services connect your software so data moves between systems automatically: CRM, payments, ERP, ecommerce, support and AI tools. Elgrith designs and builds custom integrations and REST or GraphQL APIs, with authentication, retries, monitoring and documentation, and can expose your APIs to AI agents through MCP. You own every line of code.

Projects delivered since 2015
1,000+
Clients served
250+
AI apps that reach Kenerate AI through MCP and CLI
19+
Your integration code and docs
100%

FIG 03 · Why it matters

Most apps still don’t talk to each other.

From MuleSoft’s 2025 Connectivity Benchmark and Postman’s 2025 State of the API report.

FIG 04 · Definition

API integration or API development?

API integration connects systems that already have APIs. API development builds the API itself. An MCP server is a newer kind of API, made for AI agents. Many projects need more than one.

API integration, API development or an MCP server?
API integrationAPI developmentMCP server
What it isCode that moves data between existing systems through their APIsA new REST or GraphQL API for your own product or dataA server that lets AI agents and assistants use your tools
ExampleNew Stripe payment → invoice in Xero → deal updated in HubSpotA partner API so resellers can place ordersYour product’s actions, inside Claude, ChatGPT or Cursor
You need it whenYour team copies data between apps by handPartners, apps or customers need access to your systemCustomers or staff want to use your product from an AI app
What you getSync service, monitoring, runbook and docsAPI, OpenAPI spec, SDK or examples and docsMCP server, tool definitions, auth and usage limits
Building agents on top? See AI agent development

FIG 05 · What you get

API development services

Integrations and APIs built like products: designed first, tested against sandboxes, monitored in production and documented for whoever maintains them next.

Laptop showing an integration map of apps connected to a central hub, beside a sketched diagram
API Integration · built in-house

01

Custom API integration services

Two-way sync between your CRM, payments, accounting, ecommerce and support tools, with field mapping and conflict rules agreed up front.

02

Custom REST and GraphQL APIs

Typed, versioned APIs for your product or data, designed spec-first so front ends and partners can build in parallel.

03

Public and partner APIs with OpenAPI docs

OpenAPI (Swagger) specs, keys and scopes, sandbox environments and docs that partners can follow without a call.

04

Webhooks and event-driven sync

Webhooks in and out, verified signatures and a queue behind them, so events are processed once and never lost.

05

MCP servers for AI agents

Model Context Protocol servers that expose your APIs to AI agents and to assistants like Claude, ChatGPT and Cursor, with scoped access.

06

ERP and legacy connectors

Connectors for ERPs, on-premise databases and older systems, using their APIs, file drops or a small middleware service.

Deliverables

12

deliverables, in writing

Included in every build, written into your fixed quote before work starts.

FIG 06 · Integrations

Integrations we build

The systems US and UK teams connect most often. If a tool has an API, we can usually connect it.

  • CRM
  • Payments
  • Ecommerce
  • Help desk
  • ERP and accounting
  • Database
  • Slack and email
  • AI models

  • CRM integration

    Connects
    HubSpot, Salesforce, Zoho
    Common flow
    Forms, product events and billing into one customer record
    We handle
    Deduplication, field mapping and API limits
    CRM Development

  • Payments

    Connects
    Stripe
    Common flow
    Checkout, subscriptions and refunds synced to your app and books
    We handle
    Webhook signatures and idempotent processing

  • Accounting

    Connects
    Xero, QuickBooks
    Common flow
    Invoices, payments and customers kept in step
    We handle
    Tax codes, currencies and reconciliation

  • Ecommerce

    Connects
    Shopify, WooCommerce
    Common flow
    Orders, stock and customers to your ERP, 3PL and CRM
    We handle
    Rate limits and bulk syncs

  • Messaging

    Connects
    Slack, Twilio, WhatsApp
    Common flow
    Alerts, SMS and WhatsApp updates triggered by events
    We handle
    Opt-outs, templates and delivery tracking

  • ERP and legacy systems

    Connects
    ERPs, on-premise databases, file-based systems
    Common flow
    Orders, stock and pricing between old and new systems
    We handle
    Middleware, schedules and safe write-backs
    Custom Software Development

  • AI and MCP

    Connects
    OpenAI, Anthropic and your own APIs
    Common flow
    AI features and agents that read and act on your data
    We handle
    Scoped access, logging and cost limits
    AI Agent Development

  • SaaS product integrations

    Connects
    The tools your customers already use
    Common flow
    Native integrations and a public API for your product
    We handle
    OAuth apps, per-customer tokens and docs
    SaaS Development

FIG 07 · Flagship build

Proof: Kenerate AI’s MCP and CLI

We designed and engineered Kenerate AI, an all-in-one AI image and video studio. Its MCP and CLI access is the same kind of integration layer we build for clients.

  • MCP & CLI: use Kenerate inside Claude, ChatGPT, Cursor and 19+ AI apps
  • 200+ AI models behind one app, one login and one credit balance
  • Kenerate Agent: chat with an agent that picks the model and runs the workflow
  • 23+ studios and tools, from Image Studio to Director
See the case studyVisit kenerateai.com (opens in a new tab)
Kenerate AI agent page: Kenerate inside Claude, ChatGPT and Cursor through MCP and CLI

Agent: Kenerate inside Claude, ChatGPT and Cursor

AI models in one app
200+
Studios and tools
23+
Maximum output
4K
Guides
500+

FIG 08 · Reliability

How we make integrations reliable

Third-party APIs fail, slow down and change. These patterns are part of every integration we ship.

06principles

  • Authentication done right

    OAuth 2.0, API keys, JWT or SAML, with tokens refreshed automatically and scoped to what each job needs.

  • Retries and idempotency

    Retries with exponential backoff and idempotency keys, so a timeout never creates a duplicate order or payment.

  • Rate limits and queueing

    A queue in front of every busy API, so bursts are smoothed out and vendor limits are respected.

  • Logging, alerting and tracing

    Every sync logged and traced, with alerts on failures and a dead-letter queue you can replay.

  • Versioning and contract tests

    Versioned endpoints and tests against each vendor’s sandbox, so a change on their side shows up before your users notice.

  • Secrets management

    Keys in a secrets manager, never in code or spreadsheets, and rotated on a schedule.

FIG 09 · Security

Security and compliance

Integrations move sensitive data between systems, so security is designed in from the data-flow diagram, not added at the end.

06principles

  • OWASP API Security Top 10

    Object-level authorisation, input validation and rate limiting, tested against the OWASP API Security Top 10.

  • Least privilege

    Each integration gets its own credentials with only the scopes it needs, kept separate for read and write.

  • UK GDPR data processing

    Data-processing terms in your contract, data minimised in transit and logs kept free of personal data.

  • PCI scope reduction

    Card data handled by Stripe’s hosted fields and checkout, so it never touches your servers.

  • Evidence for your audits

    Data-flow diagrams, access lists and change logs your security team or SOC 2 auditor can review.

  • Data residency

    Hosting in US, UK or EU cloud regions, in accounts registered to your business.

FIG 10 · Measurement

How we monitor an integration

Every integration ships with a dashboard and alerts, so problems show up for us before they show up for your customers.

The integration health scorecard
MetricWhat it tells youHow we measure it
Sync success rateShare of events processed end to endLogged per run, with failures queued for replay
Sync lagHow far behind one system is from anotherTimestamps compared at each step
Retries and dead lettersWhere a vendor or a data rule is failingQueue metrics and alerts
Rate-limit headroomHow close you are to a vendor’s API limitsCalls counted per window, per vendor
Data driftWhether records still match across systemsScheduled reconciliation reports
Vendor changesWhether an upstream API change is comingChangelogs and deprecation notices tracked per vendor

Alert thresholds, response times and who gets paged are agreed in your written scope.

Next step

Give customers a front end for that data

Once your systems are connected, a secure portal lets customers and partners see orders, invoices and documents themselves.

Web portal development

FIG 11 · Process · 6 steps

Map first, then connect

No data moves until the flows are agreed in writing. After a free call you get a fixed written quote for each phase.

Book a call
  1. Step 01

    Map your systems

    Every system, API, owner and data field involved, with the current manual steps written down.

  2. Step 02

    Design the data flows

    Triggers, field mapping, conflict rules and error handling, agreed with you as a diagram and a spec.

  3. Step 03

    Build in sprints

    Typed clients, queues and sync jobs, demoed weekly against vendor sandboxes.

  4. Step 04

    Test with sandbox data

    Happy paths, failures, retries and edge cases, tested before any production data moves.

  5. Step 05

    Launch

    A staged rollout with backfills where needed, monitored closely from the first sync.

  6. Step 06

    Monitor and maintain

    Dashboards, alerts and vendor change tracking, with a support plan agreed in your scope.

FIG 12 · What you get

Everything included

Written into your fixed quote, so you know exactly what you are paying for before work starts.

12items

  • System and data-flow map
  • Written scope and fixed quote
  • Integration spec with field mapping
  • Custom integration or API code
  • OpenAPI spec and developer docs
  • Retries, idempotency and queueing
  • Logging, alerts and a health dashboard
  • Secrets stored in a secrets manager
  • Sandbox and production environments
  • Test suite against vendor sandboxes
  • Runbook for failures and vendor changes
  • Full source code, owned by you

FIG 13 · Tech & tools

The tools behind the work

Proven, well-supported tools, chosen for your project and set up in accounts your business owns.

  • REST
  • GraphQL
  • OpenAPI
  • Webhooks
  • OAuth 2.0
  • TypeScript
  • Node.js
  • Python
  • PostgreSQL
  • Redis
  • AWS SQS
  • Stripe
  • HubSpot
  • Salesforce
  • Xero
  • QuickBooks
  • Shopify
  • Twilio
  • Slack
  • Model Context Protocol
  • OpenTelemetry
  • Sentry

FIG 14 · Who it’s for

Integrations for every kind of team.

From a single CRM sync to a public API, built in your stack and run on your hours in the USA and UK.

3 audiences

Operations

Stop copying data between apps.

Connect your CRM, payments and accounting so orders, invoices and customers stay in step without manual exports.

  • CRM, Stripe and Xero or QuickBooks in sync
  • Alerts in Slack or email
  • Clear reports when data doesn’t match
  • A runbook your team can follow

FIG 15 · Working with us from the USA and UK

Built in New Delhi. Run on your hours.

Every project gets a point of contact in New York or London and an engineering team in New Delhi. Here is how today’s working days line up, live.

Three ways to work together

  1. 01

    Fixed-scope project

    A written scope, one fixed price and a dated plan. Suits websites, apps and MVPs.

  2. 02

    Dedicated team

    Designers and engineers on your roadmap every month, billed monthly.

  3. 03

    White label

    For US and UK agencies: our work, your brand, unbranded deliverables.

Every engagement

  • Fixed quote in USD, GBP or INR after a free 30-minute call
  • NDA before discovery. You own all code, designs and content
  • A working demo every sprint, not status slides
  • Reply within one business day, calls inside your hours
Book a call

Calls on ET or UK hours

FIG 16 · Compare

Custom integration vs Zapier, Make or an iPaaS

Custom integration vs Zapier, Make or an iPaaS
Custom integration (Elgrith)Zapier or MakeiPaaS (MuleSoft, Boomi)Unified API
Best forCore business flows, complex logic and high volumeSimple, low-volume automationsLarge enterprises with many systems and an integration teamSaaS products that need many similar integrations fast
Complex logicAny logic you can specifyLimited; gets fragile as flows growStrong, with specialist skillsLimited to the vendor’s common data model
Cost modelFixed quote to build, then your hostingPer task or per operationPlatform licence plus specialistsPer connection or per customer
MonitoringBuilt to your needs, with alerts and replayBasic run historyStrong, inside the platformThe vendor’s dashboard
OwnershipCode assigned to youFlows live in the vendor’s accountLicensedLicensed
When not to useWhen a two-step Zap does the jobWhen volume, money or customer data is involvedWhen you have only a few systemsWhen you need deep, vendor-specific features

FAQ

Frequently asked questions

Straight answers about API Integration with Elgrith.

API integration services connect your software through APIs so data moves automatically between systems, for example from a web form to your CRM, from Stripe to your accounting software, or from your store to your ERP. A good integration includes authentication, error handling, retries, monitoring and documentation, not just the code that moves the data.

FIG 17 · Related

Keep exploring

All services

Free 30-minute call

Tell us which systems need to talk.

List the apps and the manual steps between them. After a free call you get a data-flow map and a fixed written quote.

Book a callStart a project

connect@elgrith.com+91 96039 20001Custom software development

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