If you’ve followed our last post on Deploying Your First Smart Contract Using KID, you probably deployed your first contract without touching a single CLI or RPC node.
That’s a big step, but now comes the question:
How do you interact with that contract from your frontend or backend app?
In traditional development, this would be the part where you spin up an Express server or create API routes for your app. But in Web3, it usually means diving into ABI encoding, JSON-RPC specs, node configs, and all kinds of backend glue.
That’s exactly what Kalp Studio’s API Gateway was designed to eliminate.
In this article, we’ll walk you through how to go from a deployed smart contract to production-ready REST APIs, all within Kalp Studio. We’ll also cover how to test those endpoints using Postman, just like you would in any modern SaaS workflow.
Why Blockchain Needs an API Layer
Too often in Web3, smart contracts are treated as standalone artefacts, written, deployed, and then left for dApps to “figure out” how to interact with them.
Here’s the problem with that:
- ABIs are not developer-friendly
- Most frontends rely on hardcoded contract calls
- Security bugs creep in when contract logic is manually replicated
- There’s no standardisation around endpoints or auth
Kalp Studio’s API Gateway turns smart contracts into modular microservices by auto-generating a suite of API endpoints for any deployed contract.
What’s Changed (and Why This Matters)
The traditional Web3 dev stack expects you to write Solidity/GoLang and backend logic and API routes, just to expose a simple transfer() function or fetch a balanceOf().
With Kalp’s API Gateway, here’s what shifts:
- No need to host or manage backend infra
- Smart contract functions automatically become callable endpoints
- You can add auth, keys, and rate limits like a real API
- You can test it on Postman (no need to reinvent workflows)
This means faster prototyping, cleaner separation of concerns, and more maintainable dApps.
Getting Started with the API Gateway
Let’s say you’ve already deployed a contract using KID. Now here’s how to turn that into usable APIs.
Step 1: Access the API Gateway
- Log in to Kalp Studio Console
- In the Dashboard, navigate to API Gateway under “Products”
You’ll land on the API management dashboard.
Step 2: Select Your Smart Contract
You’ll see a list of all the projects and deployed contracts linked to your account. Choose the one you want to expose APIs for.
Step 3: Create New Endpoints
Click “Generate Endpoints” of your desired smart contract:
This automatically generates secure, RESTful endpoints for you.
No backend code. No ABI encoding. Just ready-to-use APIs.
Using Postman to Test the Endpoints
Once your endpoints are live, you can test them exactly like any API.
Step 1: Open Postman
Log in to Postman, and create a new request and choose the method POST.
Step 2: Enter the Endpoint URL
Use the endpoint URL provided in Kalp Studio, e.g.:
POST https://gateway-api.kalp.studio/v1/contract/kalp/invoke/v8QRefXUzNlpxXr5rLJkNBM7SG74wiuI1752749864015/Initialize
Step 3: Add Header
In the “Headers” section, put ‘x-api-key' under the Key section, and in the “Body” section, copy the route details from the API Gateway, as shown in the screenshot.
In the ”args” section, add the desired ”name”, ”symbol” and ”decimal” arguments.
Step 4: Run the Request
Once you’ve added the parameters to Postman, click on “Send”, and if everything is right at your end, you’ll see the status of success.
That’s it. Your smart contract is now accessible via modern API tooling, no custom scripts required.
Why This API Layer Is Crucial?
For developers building production-ready dApps, Kalp’s API Gateway solves some major pain points:
- Frontend developers don’t need to learn Solidity or RPCs
- Product teams can test features with Postman before writing UI
- Ops teams can monitor and secure contract interactions via APIs
- Cross-chain support lets you run the same logic across Ethereum, Kalp DLT, and more
It also enables a plug-and-play backend strategy, ideal for startups and enterprises alike.
Real-World Use Case: NFT Claim App
Let’s say you’ve deployed an NFT contract and want users to claim an NFT through your frontend.
With Kalp’s tools, your stack looks like this:
- Smart contract deployed using KID
- Claim endpoint generated via API Gateway
- KS Embedded Wallet used to sign and execute the claim
- KS Explorer logs and monitors all transactions
What’s Coming Next
Kalp’s API Gateway is still evolving, and it’s already helping teams launch dApps faster without bloated infrastructure or developer overhead.
In our next post, we’ll explore how you can:
- Toggle and test your contracts in Postman
- Monitor transactions live on Kalp Explorer
- Build dynamic frontend experiences without writing any backend code
Conclusion
Kalp’s API Gateway brings the missing piece to modern Web3 development. You’ve already abstracted wallet creation and contract deployment. This completes the picture by letting your frontend talk to the blockchain like any normal app would.
Coming up next: We’ll show how to toggle between endpoints in Postman and track activity using Kalp Explorer.
Stay tuned.
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