Analytics endpoints require a Pro plan subscription or higher.
Referrers data allows you to analyze where your link traffic is coming from, including both the referrer domain and the full referrer URL.

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Referrer domain analytics

The top referrers by event count, including referrer names. 
import { Dub } from "dub";

export const dub = new Dub({
  token: process.env.DUB_API_KEY,
});

const result = await dub.analytics.retrieve({
  event: "clicks",
  groupBy: "referrers",
  linkId: "clux0rgak00011...",
  interval: "30d",
});

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Referrer URL analytics

The top referrer URLs by event count, including full URLs. 
import { Dub } from "dub";

export const dub = new Dub({
  token: process.env.DUB_API_KEY,
});

const result = await dub.analytics.retrieve({
  event: "clicks",
  groupBy: "referer_urls",
  linkId: "clux0rgak00011...",
  interval: "30d",
});