Exchange API

The next step is to create an API that allows users to convert between currencies. The API must use a third-party service to fetch exchange rates. Note that this microservice must be implemented in Python.

flowchart LR
    subgraph api [Trusted Layer]
        gateway --> account
        gateway --> auth
        account --> db@{ shape: cyl, label: "Database" }
        auth --> account
        gateway e1@==> exchange:::red
        gateway --> product
        gateway --> order
        product --> db
        order --> db
        order --> product
    end
    exchange e3@==> 3partyapi:::green@{label: "3rd-party API"}
    internet e2@==>|request| gateway
    e1@{ animate: true }
    e2@{ animate: true }
    e3@{ animate: true }
    classDef red fill:#fcc
    classDef green fill:#cfc
    click product "#product-api" "Product API"

Attention

To consume the API, the user must be authenticated.

Using FastAPI1 (or another framework) on Python , create a REST API that allows users to convert between currencies. The API should expose the following endpoint:

GET /exchanges/{from}/{to}

Get the current exchange rate from one currency to another. E.g. GET /exchange/USD/EUR.

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{
    "sell": 0.82,
    "buy": 0.80,
    "date": "2021-09-01 14:23:42",
    "id-account": "0195ae95-5be7-7dd3-b35d-7a7d87c404fb"
}

Response code: 200 (ok)

The API should rely on a third-party service to fetch exchange rates. You can use the free tier of any of the following, e.g.:

Or, you can scrape the data from a website.

Hint

You can use the requests library to make HTTP requests to the third-party API.

  1. FastAPI - First Steps. ↩