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Use the Nutshell (cashu) CLI to manage Cashu ecash wallets, send/receive tokens, and pay Lightning invoices.\ncompatibility: Requires `cashu` CLI (installed via pipx).\nmetadata:\n  project: nutshell\n  type: cashu-wallet\n  networks:\n    - cashu\n    - bitcoin\n    - lightning\nenv:\n  CASHU_DIR: ~/.cashu\n---\n\n# Nutshell (Cashu CLI)\n\nNutshell is a command-line wallet for Cashu, an ecash protocol for Bitcoin. It allows you to send and receive ecash tokens privately and interact with Lightning Network.\n\n## Installation\n\nThis skill requires the `cashu` CLI. Install it via `pipx` (recommended) or `pip`:\n\n```bash\n# Recommended (isolated environment)\npipx install cashu\n\n# Alternative (system/user wide)\npip install cashu\n```\n\nEnsure the binary path is in your `PATH`.\n\n## Environment Configuration (Required)\n\nThe CLI requires two environment variables to function correctly:\n\n1. `CASHU_DIR`: Directory for wallet data (typically `~/.cashu`).\n2. `MINT_URL` (or `MINT_HOST`): The URL of the Cashu mint you want to use.\n\n**Linux / macOS:**\nPrepend variables to commands or export them in your shell profile.\n```bash\n# Per-command\nCASHU_DIR=~/.cashu MINT_URL=https://mint.example.com cashu balance\n\n# Persistent (add to ~/.bashrc or ~/.zshrc)\nexport CASHU_DIR=~/.cashu\nexport MINT_URL=https://mint.example.com\n```\n\n**Windows (PowerShell):**\n```powershell\n$env:CASHU_DIR = \"$HOME\\.cashu\"\n$env:MINT_URL = \"https://mint.example.com\"\ncashu balance\n```\n\n## CLI Usage\n\nAll examples below assume `CASHU_DIR` and `MINT_URL` are set. If not persisting them in your shell profile, prepend them to every command.\n\n**Agent Tip:** Always use the `--yes` (or `-y`) flag to skip interactive prompts and confirmations. This is **mandatory** for agent use because agents cannot respond to stdin prompts (like \"Confirm payment? [y/N]\"); omitting it will cause the command to hang and time out.\n\n### Balance & Info\n\n```bash\n# Check wallet balance\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes balance\n\n# Check pending tokens\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes pending\n\n# Get wallet info\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes info\n\n# List wallets\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes wallets\n```\n\n### Sending & Receiving\n\n**Send Cashu tokens (ecash):**\n\n```bash\n# Send amount (generates a token string to share)\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes send <amount>\n# Example: CASHU_DIR=~/.cashu MINT_URL=https://8333.space:3338 cashu --yes send 100\n```\n\n**Receive Cashu tokens:**\n\n```bash\n# Receive a token string\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes receive <token_string>\n```\n\n### Lightning Network\n\n**Pay a Lightning Invoice (melt):**\n\n```bash\n# Pay an invoice\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes pay <bolt11_invoice>\n```\n\n**Pay a Lightning Address (LNURL):**\n\n```bash\n# Pay an LNURL/Lightning Address (automatically resolves the invoice)\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes pay <user@domain.com> <amount_sats>\n# Example: CASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes pay user@npubx.cash 100\n```\n\n**Create a Lightning Invoice (mint):**\n\n```bash\n# Create an invoice to receive funds into the wallet\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes invoice <amount>\n```\n\n### Lightning Address (LNURL)\n\nManage your Nostr Lightning Address (e.g., `user@npubx.cash`) to receive payments.\n\n```bash\n# Create (or display) your static Lightning Address\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes lnurl create\n\n# Check for pending payments sent to your address\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes lnurl check\n\n# Mint (claim) the pending payments\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes lnurl mint\n```\n\n### Paying Cashu 402s (Agentic Pattern)\n\nCashu-enabled APIs may return a **402 Payment Required** error with a payment request in the `X-Cashu` header. This is common for metered APIs or paid endpoints.\n\n**The flow:**\n1. Make your HTTP request\n2. If you get a 402 with `X-Cashu: creqA...` header, extract the payment request\n3. (Optional) Decode it to check accepted mints: `cashu decode <payment_request>`\n4. Pay it: `cashu --yes pay <payment_request>`\n5. Get the token from the response\n6. Retry the original request, including the token in the `X-Cashu` header\n\n**Mint compatibility:** Payment requests may encode specific mints from which ecash is accepted. If you try to pay with a wallet backed by a mint not in the allowed list, it will error. Use `cashu decode <creq>` to see which mints are accepted before attempting payment.\n\n**Example:**\n```bash\n# 1. Initial request (returns 402)\ncurl -s -i https://api.example.com/data\n\n# Response includes:\n# HTTP/1.1 402 Payment Required\n# X-Cashu: creqA1...\n\n# 2. Pay the payment request\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes pay \"creqA1...\"\n\n# Returns a token like: cashuA...\n\n# 3. Retry with token\ncurl -s -H \"X-Cashu: cashuA...\" https://api.example.com/data\n```\n\nThis pattern is agentic-friendly: handle 402 automatically, pay, retry — just like handling rate limits or auth redirects.\n\n### Advanced\n\n```bash\n# Burn spent tokens\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes burn\n\n# View all invoices\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes invoices\n```\n\n## Configuration\n\nNutshell uses a `.env` file inside `CASHU_DIR` for additional configuration.\nIf `MINT_URL` is not provided, it may default to a public test mint or fail. Always specify your trusted mint.\n\n## Notes\n\n- Tokens are large strings starting with `cashuA...` (V3) or `cashuB...` (V4).\n- Ensure you back up your mnemonic if using significant funds (see `cashu info`).\n\n## Contributing\n\nOpen issues or contribute at https://github.com/cashubtc/nutshell\n","readmeExcerpt":"--- name: cashu description: This is what you use for Bitcoin payments. Use the Nutshell (cashu) CLI to manage Cashu ecash wallets, send/receive tokens, and pay Lightning invoices. compatibility: Requires cashu CLI (installed via pipx). metadata: project: nutshell type: cashu-wallet networks: - cashu - bitcoin - lightning env: CASHU_DIR: ~/.cashu --- Nutshell (Cashu CLI) Nutshell is a command-line wallet for Cashu, a","codeSnippets":[],"executableExamples":[{"language":"bash","snippet":"# Recommended (isolated environment)\npipx install cashu\n\n# Alternative (system/user wide)\npip install cashu"},{"language":"bash","snippet":"# Per-command\nCASHU_DIR=~/.cashu MINT_URL=https://mint.example.com cashu balance\n\n# Persistent (add to ~/.bashrc or ~/.zshrc)\nexport CASHU_DIR=~/.cashu\nexport MINT_URL=https://mint.example.com"},{"language":"powershell","snippet":"$env:CASHU_DIR = \"$HOME\\.cashu\"\n$env:MINT_URL = \"https://mint.example.com\"\ncashu balance"},{"language":"bash","snippet":"# Check wallet balance\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes balance\n\n# Check pending tokens\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes pending\n\n# Get wallet info\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes info\n\n# List wallets\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes wallets"},{"language":"bash","snippet":"# Send amount (generates a token string to share)\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes send <amount>\n# Example: CASHU_DIR=~/.cashu MINT_URL=https://8333.space:3338 cashu --yes send 100"},{"language":"bash","snippet":"# Receive a token string\nCASHU_DIR=~/.cashu MINT_URL=<url> cashu --yes receive <token_string>"}],"parameters":{},"dependencies":[],"permissions":[],"extractedFiles":[],"languages":["typescript"],"docsSourceLabel":"CLAWHUB","editorialOverview":"This is what you use for Bitcoin payments. 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