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Simplest way to start is to clone this git repo that has a sample bot ready to go: https://github.com/neynarxyz/farcaster-examples
In our farcaster-examples repo, gm_bot is an automated messaging bot designed to cast a ‘gm ’ message in Warpcast every day at a scheduled time. The bot operates continuously as long as the system remains online. It leverages Neynar API and is built using @neynar/nodejs-sdk.

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Prerequisites

  • Node.js: A JavaScript runtime built on Chrome’s V8 JavaScript engine. Ensure you have Node.js installed on your system.

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Installation

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Setting Up the Environment

1

Install PM2

PM2 is a process manager for Node.js applications. Install it globally using npm:
npm install -g pm2
2

Install Project Dependencies

Navigate to the project directory and run one of the following commands to install all required dependencies:
yarn install
3

Configure Environment Variables

  • Copy the example environment file: 
    cp .env.example .env
  • Open the repo in your favorite editor and edit .env file to add your NEYNAR_API_KEY and FARCASTER_BOT_MNEMONIC. Optionally, you can also specify PUBLISH_CAST_TIME and TIME_ZONE for custom scheduling.

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Generating a Signer

Before running the bot, you need to generate a signer and get it approved via an onchain transaction. To execute the transaction, you’ll need a browser extension wallet with funded roughly $2 worth of OP ETH on the Optimism mainnet. This is crucial for the bot’s operation. Run the following command in the terminal: 
yarn get-approved-signer
This command will create some logs in your terminal. We will use these logs for upcoming steps below.

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Approving a signer

In order to get an approved signer you need to do an on-chain transaction on OP mainnet.
1
Go to Farcaster KeyGateway optimism explorer https://optimistic.etherscan.io/address/0x00000000fc56947c7e7183f8ca4b62398caadf0b#writeContract
2
Connect to Web3.
3
Remember the terminal logs we generated one of the earlier steps? You will see values for fidOwner, keyType, key, metadataType, metadata, deadline, sig in your terminal logs. Navigate to addFor function and add following values inside the respective placeholders.
4
Press “Write” to execute the transaction. This will create a signer for your mnemonic on the OP mainnet.

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Running the Bot

1

Start the Bot

Launch the bot using the following command:
yarn start
2

Verify the Process

Ensure that the bot is running correctly with:
pm2 status
3

View Logs

To check the bot’s activity logs, use:
pm2 logs
4

Stopping the Bot

If you need to stop the bot, use:
pm2 kill

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License

gm_bot is released under the MIT License. This license permits free use, modification, and distribution of the software, with the requirement that the original copyright and license notice are included in any substantial portion of the work.

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FAQs/Troubleshooting

Check the PM2 logs for any errors and ensure your system’s time settings align with the specified TIME_ZONE, also ensure that the process is running.

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Ready to start building?

Get your subscription at neynar.com and reach out to us on Slack with any questions!