Farcaster on any website.

Every Farcaster user has an FID (a numeric Farcaster ID) registered on the Optimism Layer 2 ID Registry contract. The on-chain registry stores the FID, an Ethereum custody address, and a recovery address. Off-chain, every cast (the Farcaster equivalent of a tweet, up to 320 characters), reaction, follow, and channel membership replicates across a network of Hubs: peer-to-peer servers that gossip new messages and serve a public HTTP API. Anyone can run a Hub, and several public providers (Neynar, Pinata, Warpcast, and the official Farcaster Hub from Merkle Manufactory) let widgets and apps query the network without operating their own infrastructure. A widget that wants to embed a Farcaster feed must resolve the handle to an FID via the Optimism registry, then query a Hub for the latest casts. Poper does this automatically: paste any handle, FID, or channel slug and the widget hits the right Hub, fails over to backup Hubs if the primary is unreachable, and caches casts at our CDN edge for fast subsequent loads. Because the FID is on Optimism, your account is portable across every client (Warpcast, Supercast, Yup, Farcord) and your embed keeps working even if a particular Hub disappears.

Farcaster's biggest divergence from Web2 social is identity ownership. Your FID is an asset on Optimism Layer 2, controlled by your custody Ethereum address with a separate recovery address you can rotate. No company can suspend your FID, change its handle without your signature, or revoke its access to the protocol. Compare that to X, Threads, or any other centralized social: those accounts are licenses that can be revoked, suspended, or rate-limited at the platform's discretion. For founders, journalists, NFT artists, and creators with strong personal brands, the on-chain FID is a meaningful upgrade. For widget embeds, the implication is even more practical: a Farcaster embed cannot be broken by a platform suspending your account or rotating its API. The widget resolves the FID through the on-chain registry and queries any public Hub, so the only way to break a Farcaster embed is to take the entire Optimism Layer 2 offline, which is a different category of risk from a single corporate account ban. Poper leans into this by querying the registry on every cache miss so your embed always reflects the canonical on-chain state.

Frames launched in January 2024 and immediately reshaped what casts could do. A Frame is an interactive payload embedded inside a cast: it renders an image, exposes up to four buttons, and accepts user input. When a viewer taps a Frame button, the client sends a signed message back to the Frame server, which can return a new image, mint an NFT, swap a token, run a poll, gate access to content, or trigger any onchain or off-chain action. Frames turned Farcaster from a Twitter clone into a social application platform. Within weeks of launch, developers shipped mint Frames, swap Frames, governance Frames, gated content Frames, and games. Daily active users on Farcaster roughly tripled in Q1 2024 and never returned to pre-Frames levels. For widget embeds, Frames are the killer feature: visitors to your site can interact with a mint Frame or a tip Frame directly from the embedded cast, without bouncing to Warpcast and without installing a wallet on Free plans (Pro plans optionally connect a wallet for full interactivity). Poper renders Frames natively, lazy-loads the Frame payload on viewport entry, and on Pro proxies button clicks so the entire Frame loop happens in your embed.

Farcaster channels are the protocol's answer to Reddit subreddits and Discord channels. A channel is a topical container (/base, /ethereum, /dev, /founders, /nft, /memes) that anyone can post a cast to by tagging the channel slug. Channels surface on the Warpcast home screen and have their own moderation, follow lists, and trending feeds. By 2026 the most active channels (/base, /ethereum, /founders, /memes, /degen) host tens of thousands of casts a week and serve as the primary discovery surface for new users. For embeds, channel feeds beat personal FID feeds for community-focused pages: instead of a single founder's casts, you embed the entire conversation around your protocol, your Layer 2, your DAO, or your developer ecosystem. A Layer 2 docs site embeds /base or /optimism. An NFT mint page embeds /nft. A DAO contributor portal embeds /governance. Poper supports channel feeds natively, with engagement-based sorting so you can highlight the most-recasted casts (great for trust pages) or chronological for live feeds (great for AMA threads).

Farcaster and Lens Protocol are the two leading Web3-native social protocols, and they take meaningfully different approaches. Lens (built by the Aave team and launched in 2022) anchors profiles to NFTs on Polygon: every Lens profile is a Profile NFT, every post is a Publication NFT, and every follow mints a Follow NFT. The result is a social graph that lives entirely as transferable on-chain assets but pays gas for every interaction (mitigated by Lens V3's gasless mode through dispatcher contracts). Farcaster takes the opposite tradeoff: identity is on-chain (FID on Optimism), but casts and reactions live off-chain in the Hub network for free, instant interactions. The pragmatic split has paid off for Farcaster, which surpassed Lens in daily active users by mid-2024 and kept growing through Frames adoption. Other Web3 social rivals (Mastodon-style Bluesky, Mirror for long-form, Paragraph for newsletters, Phaver for cross-protocol) serve adjacent use cases but do not compete head-on with Farcaster's combination of low-friction posting, on-chain identity, and Frame interactivity. For website embeds, Farcaster's choice to keep casts off-chain in Hubs is what makes the embed fast and free: your widget pulls from a Hub HTTP API in milliseconds, with no gas to read and no Layer 2 RPC dependency in the hot path.