> ## Documentation Index
> Fetch the complete documentation index at: https://second.tech/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Built with Bark

> Real apps shipping bitcoin payments on Ark, Lightning, and on-chain. Built by teams using the Bark SDK and Barkd.

## Mobile wallets

<Columns cols={2}>
  <Card title="Noah" href="https://github.com/smolcars/noah" icon="https://mintcdn.com/second-0659a37d/Hj3ymPegMZ0nhCcg/images/built-with-bark/noah-logo.svg?fit=max&auto=format&n=Hj3ymPegMZ0nhCcg&q=85&s=a8875b94b18c7b9a7a51f7a1443b4efa" width="300" height="300" data-path="images/built-with-bark/noah-logo.svg">
    A full-stack mobile Ark wallet, pairing a React Native app with its own Rust backend for account flows and Lightning integration.

    <p className="showcase-tags">
      React Native · Rust · iOS · Android
    </p>
  </Card>

  <Card title="Arké" href="https://github.com/GBKS/arke" icon="https://mintcdn.com/second-0659a37d/Hj3ymPegMZ0nhCcg/images/built-with-bark/arke-logo.svg?fit=max&auto=format&n=Hj3ymPegMZ0nhCcg&q=85&s=fd008ba6cc75f0bff81447b0c2d0c56e" width="300" height="300" data-path="images/built-with-bark/arke-logo.svg">
    A design-led native iOS wallet that brings bitcoin.design's open-source UX to life, and forges new ground for Ark-native patterns.

    <p className="showcase-tags">
      Swift · iOS
    </p>
  </Card>

  <Card title="Cypher Box" href="https://github.com/CypherBoxLLC/Cypher-Box" icon="https://mintcdn.com/second-0659a37d/Hj3ymPegMZ0nhCcg/images/built-with-bark/cypherbox-logo.svg?fit=max&auto=format&n=Hj3ymPegMZ0nhCcg&q=85&s=b4597deefdd944d81b2ed5fbf5dee880" width="300" height="300" data-path="images/built-with-bark/cypherbox-logo.svg">
    A three-tier wallet that scales with you: Lightning Accounts on Coinos and Strike, hot self-custody, and air-gapped cold storage.

    <p className="showcase-tags">
      React Native · iOS · Android
    </p>
  </Card>

  <Card title="Satsigner" href="https://github.com/satsigner/satsigner" icon="https://mintcdn.com/second-0659a37d/Hj3ymPegMZ0nhCcg/images/built-with-bark/satsigner-logo.svg?fit=max&auto=format&n=Hj3ymPegMZ0nhCcg&q=85&s=9d3b3ff5267a047aee225cc701f46ff6" width="300" height="298" data-path="images/built-with-bark/satsigner-logo.svg">
    A Sparrow-style mobile signer with visual UTXO control, full multisig PSBT workflows, and Nostr-based label sync across devices.

    <p className="showcase-tags">
      TypeScript · Expo · iOS · Android
    </p>
  </Card>
</Columns>

## Node

<Columns cols={2}>
  <Card title="Bark Wallet" href="https://apps.umbrel.com/app/bark-wallet" icon="https://mintcdn.com/second-0659a37d/fr2gRCXlwDkAqNyO/images/built-with-bark/bark-wallet-logo.svg?fit=max&auto=format&n=fr2gRCXlwDkAqNyO&q=85&s=d4262abf12b09324ac96b79de4486c4f" width="300" height="300" data-path="images/built-with-bark/bark-wallet-logo.svg">
    Send and receive bitcoin across Lightning, Ark, and on-chain from a single, simple wallet that uses barkd under the hood. One-click install from your Umbrel app store.

    <p className="showcase-tags">
      Umbrel · Built by Second
    </p>
  </Card>
</Columns>

## API and CLI

<Columns cols={2}>
  <Card title="Bark" href="https://gitlab.com/ark-bitcoin/bark" icon="https://mintcdn.com/second-0659a37d/Hj3ymPegMZ0nhCcg/images/built-with-bark/bark-logo.svg?fit=max&auto=format&n=Hj3ymPegMZ0nhCcg&q=85&s=5f4cda43b4edf869dff6e503c10030d4" width="300" height="300" data-path="images/built-with-bark/bark-logo.svg">
    The reference Rust implementation of the Ark protocol. Includes a CLI wallet, and the engine inside Barkd and every Bark SDK.

    <p className="showcase-tags">
      Rust · CLI · Built by Second
    </p>
  </Card>

  <Card title="Barkd" href="https://gitlab.com/ark-bitcoin/bark" icon="https://mintcdn.com/second-0659a37d/Hj3ymPegMZ0nhCcg/images/built-with-bark/bark-logo.svg?fit=max&auto=format&n=Hj3ymPegMZ0nhCcg&q=85&s=5f4cda43b4edf869dff6e503c10030d4" width="300" height="300" data-path="images/built-with-bark/bark-logo.svg">
    Bark as a long-lived daemon, exposing a REST API for backend services and integrations.

    <p className="showcase-tags">
      Rust · Daemon · Built by Second
    </p>
  </Card>
</Columns>

## Payment processing

<Columns cols={2}>
  <Card title="BTCPay Server plugin" href="https://gitlab.com/ark-bitcoin/bark-btcpay" icon="https://mintcdn.com/second-0659a37d/Hj3ymPegMZ0nhCcg/images/built-with-bark/btcpay-logo.svg?fit=max&auto=format&n=Hj3ymPegMZ0nhCcg&q=85&s=1b663800be3340ecebbf299da6ad772f" width="300" height="300" data-path="images/built-with-bark/btcpay-logo.svg">
    Add self-custodial Lightning payments to your BTCPay checkout without running a Lightning node or managing channel liquidity.

    <p className="showcase-tags">
      BTCPay Server · Built by Second
    </p>
  </Card>

  <Card title="ArkAPI" href="https://arkapi.dev" icon="https://mintcdn.com/second-0659a37d/Hj3ymPegMZ0nhCcg/images/built-with-bark/arkapi-logo.svg?fit=max&auto=format&n=Hj3ymPegMZ0nhCcg&q=85&s=79fc2450ebd49cf0b532a85b1747dab6" width="300" height="300" data-path="images/built-with-bark/arkapi-logo.svg">
    A pay-per-call API gateway for AI agents. Sats-metered sessions over Ark or Lightning, with no signup or API keys.

    <p className="showcase-tags">
      Go · Web · Telegram bot
    </p>
  </Card>
</Columns>

***

Built something on Bark? We'd love to feature it. Tell us about your app on the [community forum](https://community.second.tech) or in our [community chat](https://chat.second.tech).