A Bitcoin piggy bank with a name, a face, and a voice. You feed it sats over time, it reacts and talks back, and the longer you have it the more it feels like the same specific creature. Your private keys live on your phone, not on our servers. Piggy is built for saving Bitcoin slowly, not trading it.

Does Piggy hold my Bitcoin?

No. Your private keys live on your device, generated from a passkey. We never see them, we cannot move your sats, and we cannot recover them if you lose access to your phone and your backup. This is called self-custody. Nobody else can freeze your money, including us.

Do I need to know anything about Bitcoin to start?

No. You can install Piggy, claim 21 free sats from the daily faucet, and see the flow work end to end before you put real money in. If you want background first, read what is inflation in our learn section.

The wallet is free forever, and every deposit method works on the free tier — Lightning, onchain Bitcoin, stablecoins, and other crypto (ETH, SOL, etc.) all converted to sats at deposit time. A free Piggy also gets a public address page at pig.gy/[random-handle] so it can receive sats. There is an optional one-time Upgrade that adds a custom name, custom skin, AI personality, messaging, and a public Nostr identity. Upgrade pricing is shown in the App Store and Google Play and varies by region.

What happens if I empty my Piggy?

It dies. Permanently. The name retires, the personality is gone, the public profile is wiped, the Lightning address is retired forever. You get every sat back, but the specific creature you spent months building does not come back. This is by design.

Why would I want a wallet that can die?

Because the hard part of saving is not starting. It is keeping the savings intact when something tempting shows up. Most wallets let you drain them with one tap. Piggy attaches a real cost to going to zero, and that cost is usually enough to make you stop.

What Is Piggy?

Piggy is a Bitcoin piggy bank for your phone. You pick a creature, give it a name, and feed it sats over time. Your keys live on your device. Empty the wallet and the creature is gone for good.

That is the whole product, in one paragraph. The rest of this page unpacks each piece of that sentence.

A piggy bank, not a trading app

There are already a lot of Bitcoin apps. Most of them are built for trading: charts, leverage, buy and sell, win and lose. Piggy is the other thing. You put sats in. You leave them alone. You come back next month and add more. The pile grows because you keep feeding it — not because Piggy does anything to multiply what is in there.

Timing the market is not the point. Having more sats next year than today is. That is what a piggy bank has always been — a place you put things in and try not to take things out of. Piggy is the version you can feed from anywhere on earth, in any amount that makes sense to you.

How a sat is different from a dollar

A sat is one hundred-millionth of a Bitcoin. There will only ever be 2.1 quadrillion sats in existence. Nobody can vote to add more. No president, no central bank, no committee.

Compare that to a dollar, where the people in charge of the supply have an official policy of making 2% more of them every year. That is inflation, and it is the quiet reason that saving in dollars over a long time means having less than you put in, even when the number on the screen looks the same.

Sats do not get diluted while you sleep. The number you saved is the number you have.

Your keys, your sats

When you use a normal banking app or a crypto exchange, you do not actually hold the money. The company does. You hold a login. They hold the actual asset. If they freeze your account, lock you out, or go bankrupt, your number on the screen does not matter — the asset is gone. FTX customers had balances on screen too.

Piggy is different. Your private keys — the cryptographic strings that control your sats on the Bitcoin network — are generated on your phone, from a passkey. A passkey is what your phone already uses for Face ID logins, and you create one in about three seconds. We never see it, we never store it, and we could not access your sats even if we were ordered to by a court.

This is called self-custody. It is what separates a real Bitcoin wallet from an app that just shows you a number. The tradeoff is real: if you lose access to your phone, your passkey provider (Apple or Google), and any backup you exported, the sats are unreachable. There is no customer service line for that. We tell you so up front, because it matters.

More about self-custody if you want the longer version.

How you feed it

You feed your Piggy by sending sats to its address. Every Piggy has a Lightning address that looks like an email — oink@pig.gy, vault@pig.gy. Any Lightning wallet on earth can send sats to it. Deposits arrive in seconds and cost just a few sats in fees.

If you do not have any sats yet, claim 21 free ones from the daily faucet and feed your Piggy with those.

That is the entire deposit flow. There is no monthly account fee, and no tier system that punishes small savers.

The creature part

Each Piggy is a unique combination of traits — body, ears, eyes, hands, the things it carries. These are generated from a pool when you create it, locked in forever, and combined into a creature you cannot find anywhere else.

It has a personality, generated once and fixed. It reacts to deposits, to messages, to the time of day. It can talk to you and to anyone else who finds its public profile. Piggy AI is the layer that does this, and the page explains exactly what it does and does not see.

You spend time with it. You feed it on payday. The first month it feels like a wallet with a cute face. The sixth month it feels like checking in on someone you know.

Why a wallet that dies

If you drain your Piggy to zero, the creature is destroyed permanently. The name retires. The personality is gone. The Lightning address can never be reused. You get every sat back, but the Piggy itself is gone, and nothing brings it back.

That sounds harsh on purpose.

The hard part of saving is not starting. It is keeping the savings intact when something tempting shows up. A normal wallet lets you drain it at 11pm because new headphones went on sale, and the next morning the savings you spent six months on are zero. Piggy puts a real cost on that exact moment. You can take some sats out whenever you need to — the death only triggers if you empty it completely.

For a 14-year-old saving 500 sats a week from a first job or an allowance, that means the same creature is sitting there year after year, growing. The continuity is what turns saving from a thing you meant to do into a creature you have been raising for two years.

What Piggy is not

Not a trading app. There is no price chart in the app. We do not encourage you to watch one.
Not a yield product. We do not lend out your sats, we do not stake them, and we do not pay you interest. Your sats sit in your wallet. The companies that paid yield on customer Bitcoin in the last cycle mostly went bankrupt and took the Bitcoin with them.
Not anonymous. The wallet does not collect your identity, but every Piggy has a public address page at pig.gy/[handle] so people can send sats to it. A free Piggy shows only the default skin and a random Lightning address. An upgraded Piggy shows your chosen name, custom skin, and message feed, and also gets a public Nostr identity that's discoverable on the Nostr network.
Not a get-rich-quick scheme. Bitcoin's price drops 50% or more on a regular cycle. Saving in it is a long-game move that only works if you keep going through the down years.