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What Is Piggy?

Piggy is a self-custody Bitcoin piggy bank for iOS and Android. You name it, pick its skin, feed it sats, and over time it becomes a small creature with a voice. Your keys stay on your device. Empty it and it dies, for good.

The short version

  • Self-custody. Keys live on your device, derived from your passkey. We cannot access your funds and we cannot recover them for you.
  • Passkey-first. No mandatory 12-word seed phrase. Your passkey syncs through Apple iCloud Keychain or Google Password Manager. You can optionally export a seed phrase as a backup. It is not required.
  • Piggy AI. Every Piggy has a personality generated once from a trait pool, plus a voice that reacts to deposits, messages, and time. The AI never sees your keys or your identity. More on Piggy AI.
  • Lightning-native. You feed Piggy by sending sats to its Lightning address from any Lightning wallet. An upgraded Piggy also supports onchain Bitcoin and stablecoin deposits.
  • Free to start. The wallet is free. An optional Upgrade adds the name, the custom skin, the public profile, messaging, and extra deposit rails.
  • Permanent death. Empty your Piggy and everything is gone. Name, face, voice, Lightning address. There is no recovery, by design.

How it works

You download the app and create a passkey. That takes about thirty seconds and replaces manual seed-phrase setup. Your phone's passkey provider backs it up automatically. On a new phone, you sign in and your Piggy comes back.

Once you have a Piggy, you give it a name and a skin. This is the Upgrade. Its personality is generated once from a pool of traits, so each Piggy is distinct. It reacts when you feed it, when you ignore it, and when something interesting happens on the network.

You feed it by sending Bitcoin over the Lightning Network to its Lightning address, which looks like an email address. Any Lightning wallet can send to it. An upgraded Piggy can also receive onchain Bitcoin and stablecoins, which are converted and arrive as sats.

Every sat keeps the Piggy alive. Empty the wallet and it dies. Name, skin, profile, messages, and Lightning address are retired permanently. The death mechanic is meant to make withdrawals feel costly.

Is Piggy safe?

Piggy is self-custody, which means the responsibility sits with you, not with us. The upside: we cannot freeze your funds, we cannot lose them in a hack of our servers, and we do not hold them in the first place. The downside: if you lose access to your passkey provider account and have not exported a seed phrase backup, your sats are unreachable.

The app does not collect personal information, does not run KYC, does not sell data, and does not serve ads. The legal docs (privacy, terms) spell out exactly what we see and what we do not.

Who Piggy is for

Piggy is for people who want saving small amounts of Bitcoin to feel more tangible than a number in a spreadsheet. It is not a trading app. It is not a yield product. It is a Bitcoin piggy bank with a personality.

If you already run your own node, use a hardware wallet, and think self-custody should look like a terminal, Piggy is probably not for you. If you want Bitcoin to feel like a small creature that grows when you feed it, Piggy may suit you.

For the longer version of how Piggy AI works and what it never sees, read Piggy AI: Creatures, Not Chatbots.

Start here

Then get the app and pick your Piggy.

Feed your Piggy

Name it. Pick its skin. Start stacking sats. It takes 30 seconds.