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Automating Limit Orders on Polygon with TypeScript, 0x, and Terraform
- This article is about building a TypeScript service for executing limit orders on Polygon using the 0x Swap API and Terraform.
- To keep transaction costs low, this article uses Polygon, an Ethereum Layer 2 solution and focuses on trading two assets: wrapped Ethereum (WETH) and USDC.
- The article shows how to store limit orders in a DynamoDB table and access environment variables through getEnvVar utility.
- The article demonstrates how to create a Telegram bot for receiving notifications when executing swaps. To enhance security, it also shows how to store sensitive information like Telegram bot token in AWS Secrets Manager.
- CoinGecko API is used for fetching cryptocurrency prices. The article shows how to generate a private key, withdraw assets, and handle asset balances during withdrawal.
- The article explains how to execute swap using the 0x Swap API and EIP-712 signatures. It also explains how to set allowance, prepare and send transactions, and verify transaction success.
- The core function for executing limit orders is demonstrated by fetching the current prices of assets, evaluating each order's condition and executing swaps using 0x Swap API. AWS Lambda and Sentry are used for deploying and monitoring service respectively.
- Finally, Terraform is used to provision the necessary AWS resources for the service and the article concludes by stating that this system is ready to handle trades reliably and efficiently, with robust notifications, secure secrets management, and automated scheduling.
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