kripto ₿ 💰 💸 🤑 🏴󠁧󠁢󠁷󠁬󠁳󠁿

Kripto ₿ trading platform, periodically checks the BTC-GBP exchange rate using Coinbase APIs and makes intelligent decisions whether to buy/sell Bitcoin. Executes trades using Coinbase Pro.

Architecture 🏛

Functions λ

Function	Service	Runtime	Events	Description
rate-retriever	rate-retriever	Node.js	Schedule	Retrieves the BTC-GBP exchange rate from Coinbase and publishes result to SNS.
trade	trader	Go	Invocation	Calls Coinbase Pro to make a BTC-GBP trade and publishes result to SNS.
get-wallet	trader	Go	Invocation	Calls Coinbase Pro to get accounts & balances.
rate-writer	data-storer	Go	SQS	Stores a trade in the database.
trade-writer	data-storer	Go	SQS	Stores a rate in the database.
data-reader	data-storer	Go	Invocation	Gets the previous week's rates from the database and returns in the response.
trade-decider	trade-decider	Python	Schedule	Makes an intelligent decision whether or not to trade BTC-GBP based on historic rates.
receipt-emailer	receipt-emailer	Java	SQS	Sends an email receipt containing all the details of the trade.

Rate Retriever ₿↔￡

• Language - JavaScript
• Runtime - nodejs12.x
• Event - Scheduled - every minute
• Services - AWS Lambda, Serverless, SNS (Publisher), Coinbase API

Request

{}

Response

{}

Trade 🤝

• Language - Go
• Runtime - go1.x
• Event - Invocation
• Services - AWS Lambda, Serverless, SNS (Publisher), Coinbase Pro API
• Idempotency - idempotencyKey sent in request payload

Request

{
    "idempotencyKey": "aa368788-bb4f-40c0-b80f-afcfdaf18574",
    "tradeType": "buy",
    "amount": "10.00"
}

Response

{}

Get Wallet 🏦

• Language - Go
• Runtime - go1.x
• Event - Invocation
• Services - AWS Lambda, Serverless, Coinbase Pro API

Request

{}

Response

{
    "gbp": {
        "id": "423e4c86-f9cc-4e9f-9ddd-03756fdaaefc",
        "balance": 0.10107396,
        "hold": 0,
        "available": 0.10107396
    },
    "btc": {
        "id": "8eef875f-0670-4d31-9952-d59f85e7a215",
        "balance": 0.0026355,
        "hold": 0,
        "available": 0.0026355
    }
}

Rate Writer 💰

• Language - Go
• Runtime - go1.x
• Event - SQS - RateUpdate queue
• Services - AWS Lambda, Serverless, SQS (Consumer), MongoDB
• Idempotency - SQS messageId used as idempotency key

Request

{
    "rate": "8012.92",
    "dateTime": "2020-05-19T19:39:00"
}

Response

{}

Trade Writer 💸

• Language - Go
• Runtime - go1.x
• Event - SQS - Trade queue
• Services - AWS Lambda, Serverless, SQS (Consumer), MongoDB
• Idempotency - SQS messageId used as idempotency key

Request

{
    "id": "aa368788-bb4f-40c0-b80f-afcfdaf18574",
    "side": "buy",
    "productId": "BTC-GBP",
    "funds": "9.95024875",
    "settled": true,
    "createdAt": "2020-05-19T19:39:00",
    "fillFees": "0.049751102976",
    "filledSize": "0.00125952",
    "executedValue": "9.9502205952"
}

Response

{}

Data Reader 💷

• Language - Go
• Runtime - go1.x
• Event - Invocation
• Services - AWS Lambda, Serverless, MongoDB

Request

{}

Response

[{
    "id": "5ecf261e05a7428989286075",
    "rate": 7553.79,
    "dateTime": "2020-05-28T02:44:53.437Z",
}, {
    "id": "5ecf270d05a7428989286079",
    "rate": 7548.3,
    "dateTime": "2020-05-28T02:50:53.776Z",
}]

Trade Decider 🤔

• Language - Python
• Runtime - python3.8
• Event - Scheduled - every minute
• Services - AWS Lambda, Serverless, SQS (Consumer)

Request

{
    "rate": "8012.92",
    "dateTime": "2020-05-19T19:39:00"
}

Response

{}

Receipt Emailer ✉️

• Language - Kotlin
• Runtime - java11
• Event - SQS - EmailReceipt queue
• Services - AWS Lambda, Serverless, SQS (Consumer)
• Idempotency - trade ID (id) in message payload used as idempotency key

Request

{
    "id": "aa368788-bb4f-40c0-b80f-afcfdaf18574",
    "side": "buy",
    "productId": "BTC-GBP",
    "funds": "9.95024875",
    "settled": true,
    "createdAt": "2020-05-19T19:39:00",
    "fillFees": "0.049751102976",
    "filledSize": "0.00125952",
    "executedValue": "9.9502205952"
}

Response

{}

Events 🚀

Trade

• Description - Signifies a trade has taken place
• SQS Queues
  • StoreTrade
  • EmailReceipt
• Publisher - trader
• Subscribers
  • trade-writer
  • receipt-emailer

Payload

{
    "id": "aa368788-bb4f-40c0-b80f-afcfdaf18574",
    "side": "buy",
    "productId": "BTC-GBP",
    "funds": "9.95024875",
    "settled": true,
    "createdAt": "2020-05-19T19:39:00",
    "fillFees": "0.049751102976",
    "filledSize": "0.00125952",
    "executedValue": "9.9502205952"
}

RateUpdate

• Description - Signifies a rate update event
• SQS Queues
  • StoreRate
  • InitiateTrade
• Publisher - rate-retriever
• Subscribers
  • rate-writer
  • trade-decider

Payload

{
    "rate": "8012.91",
    "dateTime": "2020-05-19T19:39:00"
}