Yap SignerSelf-custodial wallet

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Yap Signer

Traditional finance and crypto, connected through Yap.

Your money shouldn't have to live in separate worlds. Yap is building the wallet layer that connects them. Yap Signer is the authorization boundary: the person stays sovereign, and authorized software and agents stay inside that bound.

  • Works with Pump.fun
  • Seamless Jupiter swaps
  • Keys on device, AES-256-GCM vault
  • Custodial records 1–500
  • Allowlisted Yap origins only
  • Current build is 0.3.48
  • Store listing is 0.3.48

Yap Wallet FAQ

Start here

Create your account

Install the wallet, or open the one you already have. Create the email account on onboarding. After the code, enter the username.

Yap Signer 0.3.48

Install Yap Signer

Yap Signer is live on the Chrome Web Store. That listing is 0.3.48. This site describes the current build, 0.3.48.

Keys stay on your device. This site can ping Signer and read public status. It cannot create, import, export, or reset a wallet, and it cannot change signing rules.

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Checking this browser for Yap Signer.

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Install from the Chrome Web Store. Help stays on yap-pay.xyz.

In the extension today

What Yap Signer is

A self-custodial Chrome extension. The current build is 0.3.48. The Chrome Web Store listing is 0.3.48. It is not a general dapp connector and it does not send your phrase to Yap servers.

Create or restore

Generate a new 24-word wallet or restore an existing phrase. Creation and recovery happen in the extension popup, not on this page.

AES-GCM vault

The recovery phrase is sealed with AES-256-GCM. Unlock derives the key in memory. Locking or quitting Chrome wipes it.

Send, receive, QR

Receive SOL, ETH, BTC, BNB, HYPE, and USDC, then send those after you review the transfer. USDC includes Solana USDC and native USDC on Ethereum, Base, Arbitrum, OP Mainnet, Robinhood Chain, and HyperEVM. Bitcoin sends spend confirmed native SegWit outputs and return the change to this wallet.

Pump.fun

Yap Wallet works with Pump.fun. Find and trade those coins from the Yap Signer popup. The trade stays in the extension.

Jupiter swap

Solana swaps run through Jupiter from the same popup. A swap can start from SOL, USDC, or another Solana token, and it can sell back to SOL. Quotes use public mint addresses, not your seed or password.

Search and charts

Search SOL, ETH, BTC, BNB, HYPE, USDC, or a Solana token. Star a Solana coin to track it on Home. Tracked coins show as Watching until you hold them. Charts stay inside the popup.

Username and silent token

The master wallet gets an @adjective-noun-hex username. Silent signing stays off until you generate a one-time platform token. Allowlisted Yap sites can then ask for a Solana signature, or a transfer Yap Signer builds for BTC, ETH, BNB, HYPE, or USDC. Each silent transfer needs a fresh nonce. Sites cannot pass their own transaction data.

Custodial records 1–500

One master wallet supports custodial wallet records numbered 1 through 500. A new account opens slots 1 through 5. Yap stores the public address and the policy. Yap does not hold the private key. A saved hold, swap, or trade is not signed and is not broadcast.

One master wallet

Custodial records 1 through 500

One master wallet supports slots numbered 1 through 500. A new account opens slots 1 through 5. Each slot is a record: a public address and a policy. Yap does not hold the private key. A saved hold, swap, or trade is not signed and is not broadcast. A MoonPay or Stripe purchase, if approved, is delivered to the master wallet address on this device.

Architecture

One wallet. One signer. Multiple rails.

Yap is adding a traditional banking and payment rail beside crypto. The direction is a two-way bridge: traditional money through Yap Wallet to crypto, and back. Yap Signer is the authorization boundary on that bridge. The bridge is the direction. It is not this release.

  1. Traditional financeBanks, cards, ACH
  2. Fiat payment railMoonPay or Stripe
  3. Yap WalletOne wallet, both kinds of value

Authorization

  • Yap SignerAuthorization boundary, current
  • AgentsInside the person's authority
  1. Crypto railsSOL, USDC, YAP, and more
  2. CommerceThe transfer that settles

The other direction

  1. Crypto
  2. Yap Wallet
  3. Yap Signer
  4. Traditional rail
  5. Bank / card / fiat
Traditional money ↔ Yap Wallet ↔ Crypto

Yap Wallet is the layer above the rail. Yap Signer is the user-controlled boundary through which Yap connects the wallet, agents, and payment infrastructure. The person stays sovereign. Authorized software and agents operate inside authority the person sets.

  1. Yap Wallet
  2. Yap Signer
  3. Agents and authority
  4. Traditional and crypto rails
  5. Execution
  6. Commerce

One human-controlled wallet can authorize and coordinate multiple bounded economic actors. An agent wallet is a subordinate execution wallet. The person authorizes it for a purpose. Trading, data, commerce, a service, or an experiment are examples of that purpose. Each one would be its own address. Its authority stops at the policy the person set. It does not receive the primary wallet's key, and it does not spend the primary treasury.

The path is Intent → Policy → Authorization → Signing → Execution. The signer stays between authorization and execution.

Today

Yap Signer is the wallet on this device and the authorization boundary. The phrase stays on the device. The extension still holds the key. The current build sends crypto after review. People will buy SOL, ETH, or BTC through MoonPay or Stripe, and the coins land in the master wallet. Yap does not custody those coins. Yap's revenue on that buy is a share of what those partners earn. It is not the customer's card payment. MoonPay is under review. Stripe Crypto Onramp is an application in progress. The hosted checkout domain is crypto.link.com. A live card checkout is closed. One master wallet supports custodial records 1 through 500. A new account opens slots 1 through 5. Yap does not hold the private key for a slot. A saved hold, swap, or trade is not broadcast.

In development

The desk records the account, referrals, warmers, campaigns, and those slots. Policy on the current signer is the allowlist, the silent-sign switch, and the transfer caps for that one wallet. Yap Wallet 0.4.0 has not shipped. The Signer money path is recorded and unpaid. A live card checkout is closed.

Planned

The same wallet would move value either way. The buy brings SOL, ETH, or BTC in through MoonPay or Stripe. A later sale turns crypto into Yap Cash, and a partner ramp deposits that into the customer's bank. Yap records a cash-out bonus on that deposit. Yap Signer authorizes the wallet. An agent could form a payment intent inside the person's bound. That execution is closed. MCP is not required.

A fleet, not one shared key

The planned control layer would coordinate authorized wallets. An illustration of the bound, not a live cap:

  • Agent A$100 trading authority
  • Agent B$25/day data budget
  • Agent C$250 commerce authority

Those figures are the shape of the model. They are not product limits, and they are not live.

Signer

The user-controlled authorization boundary. Yap Signer holds the key and stands between the wallet, agents, and payment infrastructure. A request does not receive the key.

Policy

What an agent is allowed to do. A bound set by the person, not access to the primary treasury, and not an open rail.

Control layer

Configure. Authorize. Observe. Planned, and still closed. It would coordinate authorized wallets and payment activity. It would not hold their keys.

Execution layer

Execute. Monitor. Settle. The signer does this for the primary wallet after review. Agent execution, and fiat-to-crypto execution, are closed.

Payment rails

Traditional money and crypto, one wallet

Yap sits above the rail. A person should be able to move value without stopping to choose a world. That seamlessness is the direction. The signer still asks before value moves.

The buy

People will buy SOL, ETH, or BTC in the wallet through MoonPay or Stripe. The coins land in their wallet. Yap's revenue on that buy is a share of what MoonPay or Stripe earn. It is not the customer's card payment.

  • MoonPay is under review
  • Stripe Crypto Onramp is in progress
  • Hosted checkout is crypto.link.com
  • A live card checkout is closed

Crypto rails

SOL, USDC, and YAP, plus the other assets Yap Signer already supports. The current build receives and sends SOL, ETH, BTC, BNB, HYPE, and USDC after review. YAP is the denomination when a transfer settles in SOL.

  • SOL
  • USDC
  • YAP
  • Other supported assets

Agents can eventually use the same broader environment as the person who authorized them.

  1. Human
  2. Yap Signer
  3. Wallet authority
  4. Agent
  5. Payment intent
  6. Traditional or crypto rail
  7. Commerce

An agent would operate in the same financial environment as the person, on a traditional rail or a crypto rail, inside authority the person granted. Agent execution is not live. The signer still holds the key.

Control layer

Configure. Authorize. Observe.

Planned, and still closed. A person would manage wallets, agents, permissions, spending authority, payment activity, and execution status. The control layer would not hold keys.

Execution layer

Execute. Monitor. Settle.

It turns an authorized intent into a transaction on an available rail. Today, Yap Signer does that for the primary wallet after review, on crypto. Traditional-rail execution and agent execution are closed.

  • One wallet.
  • One signer.
  • Multiple rails.

Your money shouldn't have to live in separate worlds.

Yap is building the wallet layer that connects them.

Humans, agents, banks, cards, crypto, and commerce meet in one wallet layer. A later sale turns crypto into Yap Cash. A partner ramp deposits that into the customer's bank. Yap records a cash-out bonus on that deposit.

On-ramp and off-ramp

The bridge between traditional money and crypto

People will buy SOL, ETH, or BTC in the wallet through MoonPay or Stripe. The coins land in their wallet. Yap's revenue on that buy is a share of what MoonPay or Stripe earn. It is not the customer's card payment. MoonPay is under review. Stripe Crypto Onramp is an application in progress. The hosted checkout domain is crypto.link.com. A live card checkout is closed.

On-ramp

  1. MoonPay or Stripe
  2. SOL, ETH, or BTC
  3. Customer's wallet

Yap Cash

  1. Later sale
  2. Partner ramp
  3. Customer's bank

The same signer stands on both paths. A later sale turns crypto into Yap Cash. A partner ramp deposits that into the customer's bank. Yap records a cash-out bonus on that deposit. Yap does not credit a balance when a purchase is marked reported.

Yap Wallet 0.4.0

0.3.48 is the current build. 0.4.0 has not shipped.

Yap Signer 0.3.48 is the current build and the live Chrome Web Store listing. A member account is an email plus an 8-digit code, with one referral code and 5 credits per new install. One master wallet supports custodial records 1 through 500. A new account opens slots 1 through 5. Yap does not hold those private keys, and a saved row is not broadcast. A recorded purchase and a yearly SOL prize are not sent. People will buy SOL, ETH, or BTC through MoonPay or Stripe. The coins land in the master wallet. Yap's revenue is a share of partner earnings, not the card payment. MoonPay is under review, and Stripe Crypto Onramp is an application in progress, so a live card checkout is closed. The order is the product. Each step waits on the one before it. The phrase still does not go on a server.

  1. 01

    Account

    An email account on yap-pay.xyz is an email plus an 8-digit code. The code is stored only as a hash. The account password is stored only as a hash. It does not unlock the vault or approve a signature. A forgotten account password can be replaced after an emailed 8-digit code, and that code does not reset the signer vault password. One referral code per member. A new install adds 5 credits. The desk referral link is a public @username link on yap-pay.xyz. A yearly first-place prize is recorded as some SOL and is not sent. The 24-word phrase stays on the device, AES-256-GCM. People will buy SOL, ETH, or BTC through MoonPay or Stripe. The coins land in the wallet. Yap's revenue on that buy is a share of what MoonPay or Stripe earn. It is not the customer's card payment. MoonPay is under review. Stripe Crypto Onramp is an application in progress. The hosted checkout domain is crypto.link.com. A live card checkout is closed. Yap does not credit a balance when a purchase is marked reported.

  2. 02

    The desk

    This opens only after the account exists and the address is attested.

    • Referrals. An influencer code is remembered on install. One code per member. The desk referral link is a public @username link on yap-pay.xyz. A new install adds 5 credits. Nothing is recorded for the influencer until a purchase or a Yap Cash deposit is reported. The influencer then gets a slice of Yap's share. The leaderboard ranks codes by that unpaid reward. Until a partner contract names the real cut, Yap's share is 1% of the order and the influencer's slice is 20% of that share. A $100 order records $1.00 for Yap and $0.20 for the code. paid stays false. Those figures are a worked example. They are not totals, not a leaderboard, and not proof that anyone has been paid. A yearly first-place prize is recorded as some SOL and is not sent. Public referral context: https://stevenlow.xyz/affiliate.
    • Leaderboard. Competition scores belong to the attested account.
    • Follow. The same @username is the person, on Signer and on the custodial desk.
    • Warmers. A warmer counts to day 14 and does not send a transaction. Three trial marks, one top coin on Solana, one on Ethereum, and one on Bitcoin, are signed on the device and are not broadcast.
    • Campaigns and groups. Named wallets in three lanes: warming, live, and reserve. A preset does not start execution.
    • Custodial records 1 through 500. One master wallet. A new account opens slots 1 through 5. Each slot stores a public address and a policy. Yap does not hold the private key. A hold, swap, or trade is saved only after silent mode is on for the master wallet and that slot, an approved custodial KYC case exists, and that slot's access code is used. The saved row is not signed and is not broadcast. You can freeze, revoke, or replace a slot from the master wallet.
    • The buy. People will buy SOL, ETH, or BTC through MoonPay or Stripe. If approved, the coins land in the master wallet address the customer controls. Yap's revenue on that buy is a share of what MoonPay or Stripe earn. It is not the customer's card payment. MoonPay is under review. Stripe Crypto Onramp is an application in progress. The hosted checkout domain is crypto.link.com. A live card checkout is closed. Yap does not credit a balance when a purchase is marked reported. Yap does not custody the coins. A later sale turns crypto into Yap Cash. A partner ramp deposits that into the customer's bank. Yap records a cash-out bonus on that deposit.
    • In-wallet browser. It only opens member, desk, buy, and onboarding on yap-pay.xyz. It does not hold a key.
    • Chains. The current signer receives and sends SOL, ETH, BTC, BNB, HYPE, and Circle USDC. Solana swaps run through Jupiter. BNB, Base, Arbitrum, OP Mainnet, Robinhood Chain, and HyperEVM use the Ethereum address. Hyperliquid in the signer means HyperEVM. Yap does not offer perpetuals, securities, tokenized stocks, lending, or copy trading.
  3. 03

    iPhone and Android

    Same vault rule as Chrome. The phrase stays on that device. These clients are planned and not released.

  4. 04

    Control and execution

    Last, and still closed. The control layer would configure, authorize, and observe wallets, agents, permissions, and payment activity. The execution layer would execute, monitor, and settle an authorized intent on an available rail. The platform does not broadcast those agent moves.

How to use Signer

From install to first signature

  1. Install Yap Signer and open the popup, or open the side panel if you want the wallet to stay beside the page.
  2. Create a wallet or restore from 24 words.
  3. Write down the recovery phrase and confirm three words.
  4. Open Receive, pick SOL, ETH, BTC, BNB, HYPE, or USDC, then copy the address or scan the QR. Receive addresses still work while the wallet is locked.
  5. Find Pump.fun coins and swap Solana tokens through Jupiter in the popup.
  6. Leave signing on Manual unless the platform needs silent sign.
  7. For silent sign, generate a platform access token, copy it once, and paste it into Yap. Generating a new token destroys the old one.
  8. Unlock is required for signing. The private key stays in memory; locking or restarting Chrome wipes it.

Sneak peeks

Yap Wallet, up close

Dense popup mocks of Signer against the vault wallpaper. Demo numbers. One master wallet shows custodial records 1 through 500. Those records do not hold a key and do not send.

Yap SignerChrome popup
Unlocked
@rapid-otter-7cmainnet

$128.40 +2.4%

1.84 SOL · bot wallet · demo

SendReceiveSwap
  • SOL$69.781.84
  • USDC$1.0037.05
  • JUP$0.82412
  • Swap SOL → USDC2m
  • Receive 0.40 SOL1h

In the extension

Home

Username, USD ticker, send / receive / swap, token balances, demo activity.

This Yap

Built by Steven Low

Steven Low is building a wallet layer between traditional money and crypto. Yap Signer is the authorization boundary. This site is the public home for that Chrome signing client, and the intended origin of the Yap Wallet dApp. People will buy SOL, ETH, or BTC through MoonPay or Stripe. The coins land in the wallet. Yap's revenue is a share of what those partners earn, not the card payment. MoonPay is under review, so a live card checkout is closed. The broader description lives at stevenlow.xyz.

Wallet clients

  • Yap Wallet — iOS — planned, not released
  • Yap Wallet — Android — planned, not released
  • Yap Wallet — dApp — planned, not released
  • Yap Signer 0.3.48 — current Chrome build. The store listing is 0.3.48.
  • Yap Wallet 0.4.0 — expansion after Chrome, not shipped

Same name, separate products

These use the name YAP and are separate from this site.

  • Kaito / Yap-to-Earn
  • YAP.trade
  • yap.team
  • the 2021 YAP DAO
  • YAPSTONE

Machine-readable summary: /llms.txt. Structured facts: /facts.json

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Yap Signer