Bluesky API + Cloudflare Workers example: https://docs.bsky.app/docs/get-started + https://developers.cloudflare.com/workers/ = 😎

index.ts

import { BskyAgent } from "@atproto/api";

type Env = {
	BLUESKY_APP_PASSWORD: string;
	POST_TOKEN: string;
};

export default {
	async fetch(request, env, ctx): Promise<Response> {
		let url = new URL(request.url);

		if (url.pathname.startsWith("/favicon")) {
			return Response.json({}, { status: 404 });
		}

		if (!env.POST_TOKEN) {
			console.log("POST_TOKEN must not be empty.");
			return Response.json({});
		}

		// Require a shared secret (POST_TOKEN) to post, so we don't end up exposing our account to anyone
		if (url.pathname === "/post" && url.searchParams.get("POST_TOKEN") === env.POST_TOKEN) {
			const agent = new BskyAgent({
				service: "https://bsky.social",
			});

			await agent.login({
				identifier: "elithrar.bsky.social",
				// Stored in a Secret
				password: env.BLUESKY_APP_PASSWORD,
			});

			// Future: capture the content ID (cid) and cache it in order to avoid
			// publishing duplicate content.
			let { uri } = await agent.post({
				text: "This post is from a Cloudflare Worker via the Bluesky API :-)",
				createdAt: new Date().toISOString(),
			});

			return Response.json({ posted: true, uri: uri });
		}

		return Response.json({ hello: "world" });
	},
} satisfies ExportedHandler<Env>;