This guide demonstrates how to use the Neynar SDK to casts that contain a specific embed (eg. cast linking to github.com or youtube.com). Check out this Getting started guide to learn how to set up your environment and get an API key. First, initialize Neynar client: 
// npm i @neynar/nodejs-sdk
import { NeynarAPIClient, Configuration } from "@neynar/nodejs-sdk";
import { FeedType } from "@neynar/nodejs-sdk/build/api/index.js";

// make sure to set your NEYNAR_API_KEY .env
// don't have an API key yet? get one at neynar.com
const config = new Configuration({
  apiKey:process.env.NEYNAR_API_KEY,
});

const client = new NeynarAPIClient(config);
Then fetch casts linking to github.com: 

const feedType = FeedType.Filter;
const filterType= "embed_url";
const embedUrl= "github.com";

const result = await client.fetchFeed({feedType,
  filterType,
  embedUrl
});
console.log(result);
Replace github.com with any other embed url to fetch casts linking to that url. To fetch casts linking to youtube.com: 
const feedType = FeedType.Filter;
const filterType= "embed_url";
const embedUrl= "youtube.com";

const result = await client.fetchFeed({feedType,
  filterType,
  embedUrl
});
console.log(result);
And… Spotify: 
const feedType = FeedType.Filter;
const filterType= "embed_url";
const embedUrl= "open.spotify.com";

const result = await client.fetchFeed({feedType,
  filterType,
  embedUrl
});
console.log(result);
Example output: 
{
  casts: [
    {
      object: "cast_hydrated",
      hash: "0x9f617c43f00308cdb46b7b72f067b01557d53733",
      thread_hash: "0x9f617c43f00308cdb46b7b72f067b01557d53733",
      parent_hash: null,
      parent_url: "chain://eip155:7777777/erc721:0xe96c21b136a477a6a97332694f0caae9fbb05634",
      parent_author: [Object ...],
      author: [Object ...],
      text: "Yo, we got kids to raise and bills to pay, enemies to lay down when they stand in our way, it's only us \n\nhttps://open.spotify.com/track/0SlljMy4uEgoVPCyavtcHH",
      timestamp: "2023-12-11T04:06:57.000Z",
      embeds: [
        [Object ...]
      ],
      reactions: [Object ...],
      replies: [Object ...],
      mentioned_profiles: []
    }, {
      object: "cast_hydrated",
      hash: "0xe70d9d52c5019b247fa93f76779296322676a4e5",
      thread_hash: "0xe70d9d52c5019b247fa93f76779296322676a4e5",
      parent_hash: null,
      parent_url: null,
      parent_author: [Object ...],
      author: [Object ...],
      text: "For the Intuitives (Part 1)",
      timestamp: "2023-12-11T02:11:27.000Z",
      embeds: [
        [Object ...]
      ],
      reactions: [Object ...],
      replies: [Object ...],
      mentioned_profiles: []
    }, {
      object: "cast_hydrated",
      hash: "0xee6719ac805758be5bd54744bec63b7ec0bc4d3e",
      thread_hash: "0xee6719ac805758be5bd54744bec63b7ec0bc4d3e",
      parent_hash: null,
      parent_url: null,
      parent_author: [Object ...],
      author: [Object ...],
      text: "EP 214 Douglas Rushkoff on Leaving Social Media",
      timestamp: "2023-12-11T02:11:18.000Z",
      embeds: [
        [Object ...]
      ],
      reactions: [Object ...],
      replies: [Object ...],
      mentioned_profiles: []
    }, {
      object: "cast_hydrated",
      hash: "0xebe7e89b1a3e91c96f99ecf3ce7d2797e3b118b6",
      thread_hash: "0xebe7e89b1a3e91c96f99ecf3ce7d2797e3b118b6",
      parent_hash: null,
      parent_url: null,
      parent_author: [Object ...],
      author: [Object ...],
      text: "#64 AI & the Global Brain: Peter Russell",
      timestamp: "2023-12-11T02:11:04.000Z",
      embeds: [
        [Object ...]
      ],
      reactions: [Object ...],
      replies: [Object ...],
      mentioned_profiles: []
    }, {
      object: "cast_hydrated",
      hash: "0x93276da072a2902a3568da21203588995e4ba752",
      thread_hash: "0x93276da072a2902a3568da21203588995e4ba752",
      parent_hash: null,
      parent_url: null,
      parent_author: [Object ...],
      author: [Object ...],
      text: "Systems Thinking - Tomas Bjorkman - Consciousness",
      timestamp: "2023-12-11T02:10:26.000Z",
      embeds: [
        [Object ...]
      ],
      reactions: [Object ...],
      replies: [Object ...],
      mentioned_profiles: []
    }
  ],
  next: {
    cursor: "eyJ0aW1lc3RhbXAiOiIyMDIzLTEyLTExIDAyOjEwOjI2LjAwMDAwMDAifQ=="
  }
}
To fetch the next page: 

const filter= "filter";
const filterType= "embed_url";
const cursor= result.next.cursor

const nextResult = await client.fetchFeed({filter,
  filterType,
  embedUrl,
  cursor
});
There you go, fetching casts with specific embeds in Farcaster with Neynar SDK!

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