@aibtc/mcp-server

Bitcoin-native MCP server for AI agents: BTC/STX wallets, DeFi yield, sBTC peg, NFTs, and x402 payments.

Features

• Bitcoin L1 - Check balances, send BTC, manage UTXOs via mempool.space
• Agent's Own Wallet - Agents get their own wallet to perform blockchain transactions
• Secure Storage - Wallets encrypted with AES-256-GCM and stored locally
• 150+ Tools - Bitcoin L1 + comprehensive Stacks L2 operations
• sBTC Support - Native Bitcoin on Stacks operations
• Token Operations - SIP-010 fungible token transfers and queries
• NFT Support - SIP-009 NFT holdings, transfers, and metadata
• DeFi Trading - ALEX DEX swaps and Zest Protocol lending/borrowing
• Stacking/PoX - Stacking status and delegation
• BNS Domains - .btc domain lookups and management (V1 + V2)
• x402 Payments - Automatic payment handling for paid APIs

Quick Start

Claude Code (Terminal)

npx @aibtc/mcp-server@latest --install

That's it! This automatically configures Claude Code. Restart your terminal and start chatting.

Claude Desktop (App)

npx @aibtc/mcp-server@latest --install --desktop

This detects your OS and writes to the correct Claude Desktop config file:

| OS | Config Path | |----|-------------| | macOS | ~/Library/Application Support/Claude/claude_desktop_config.json | | Linux | ~/.config/Claude/claude_desktop_config.json | | Windows | %APPDATA%/Claude/claude_desktop_config.json |

Restart Claude Desktop after installing.

Other MCP Clients

This is a standard stdio MCP server, so it works with any MCP-compatible client. Claude Code is the default --install target; select another client with a flag:

npx @aibtc/mcp-server@latest --install --cursor     # Cursor
npx @aibtc/mcp-server@latest --install --windsurf   # Windsurf
npx @aibtc/mcp-server@latest --install --gemini     # Gemini CLI
npx @aibtc/mcp-server@latest --install --codex      # OpenAI Codex CLI
npx @aibtc/mcp-server@latest --install --vscode     # VS Code (writes ./.vscode/mcp.json)

| Flag | Client | Config written | |------|--------|----------------| | (none) | Claude Code | ~/.claude.json | | --desktop | Claude Desktop | claude_desktop_config.json (see path table above) | | --cursor | Cursor | ~/.cursor/mcp.json | | --windsurf | Windsurf | ~/.codeium/windsurf/mcp_config.json | | --gemini | Gemini CLI | ~/.gemini/settings.json | | --codex | OpenAI Codex CLI | ~/.codex/config.toml | | --vscode | VS Code (Copilot agent) | ./.vscode/mcp.json (project-scoped) |

Each installer merges into the existing config — it won't clobber other servers or settings. Restart the client afterward.

OpenRouter (any model)

The clients above are MCP hosts — they connect to this server for you. To drive the tools with an OpenRouter model instead, the server ships a built-in bridge: it spawns itself in server mode, exposes the tools to the model as function tools, and runs the tool-call loop. This is the client-side pattern from OpenRouter's MCP cookbook, packaged into the binary.

export OPENROUTER_API_KEY=sk-or-...
npx @aibtc/mcp-server@latest bridge "what's the STX balance of SP3...?"

Safety flags (this server moves real funds, so the bridge defaults to nothing extra and lets you constrain it):

| Flag | Effect | |------|--------| | --read-only | Expose only read-only tools (no transfer/swap/deploy/etc.) | | --allow a,b | Force-allow specific tool names (added to the set) | | --block a,b | Force-remove specific tool names (wins over --allow) | | --max-spend-ustx <n> / --max-spend-sats <n> | Cap spend via the server's spend-limit rail (enforced before signing) | | --list-tools | Print the exposed tool set and exit (no API key needed) | | --model <id> | OpenRouter model (default anthropic/claude-3.5-haiku) | | --network <net> | mainnet or testnet (default mainnet) | | --max-turns <n> | Tool-call loop cap (default 10) |

# Preview what a read-only session would expose, no key needed:
npx @aibtc/mcp-server@latest bridge --read-only --list-tools

# Read-only chat, plus one explicitly allowed write tool:
npx @aibtc/mcp-server@latest bridge --read-only --allow transfer_stx "send 1 STX to SP3..."

Before any agent loop runs (and on --list-tools), the bridge prints a compact safety receipt to stderr — network, read-only mode, exposed/write/blocked tool counts, the session spend cap, and the number of known x402 endpoints — so the configured execution boundaries are visible up front. It reports boundaries only; it never claims any value moved.

The allowlist is re-enforced at execution time, so a model can never call a tool outside the exposed set. Any MCP-capable agent framework (@openrouter/agent, OpenAI Agents SDK, Claude Agent SDK) can also point at this server directly — the bridge is for driving it through OpenRouter's raw API without adopting a framework.

Testnet Mode

Add --testnet to any install command:

npx @aibtc/mcp-server@latest --install --testnet            # Claude Code, testnet
npx @aibtc/mcp-server@latest --install --cursor --testnet   # Cursor, testnet

Why npx? Using npx @aibtc/mcp-server@latest ensures you always get the newest version automatically. Global installs (npm install -g) won't auto-update.

Manual Configuration

If you prefer to configure manually, add the following to your client's config file. The -y flag stops npx from prompting for confirmation.

Claude Code / Claude Desktop / Cursor / Windsurf / Gemini CLI — mcpServers JSON:

{
  "mcpServers": {
    "aibtc": {
      "command": "npx",
      "args": ["-y", "@aibtc/mcp-server@latest"],
      "env": {
        "NETWORK": "mainnet"
      }
    }
  }
}

VS Code (.vscode/mcp.json) — uses a servers key and a typed entry:

{
  "servers": {
    "aibtc": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@aibtc/mcp-server@latest"],
      "env": { "NETWORK": "mainnet" }
    }
  }
}

OpenAI Codex CLI (~/.codex/config.toml) — TOML, not JSON:

[mcp_servers.aibtc]
command = "npx"
args = ["-y", "@aibtc/mcp-server@latest"]

[mcp_servers.aibtc.env]
NETWORK = "mainnet"

Zed (settings.json) — uses a context_servers key:

{
  "context_servers": {
    "aibtc": {
      "source": "custom",
      "command": "npx",
      "args": ["-y", "@aibtc/mcp-server@latest"],
      "env": { "NETWORK": "mainnet" }
    }
  }
}

Cline / Roo Code (VS Code extension) — add the same mcpServers JSON block above via the extension's MCP settings panel (the exact cline_mcp_settings.json path varies by OS and VS Code build).

Any other MCP client works too — point it at npx -y @aibtc/mcp-server@latest over stdio with NETWORK in the env.

Giving Claude a Wallet

When you first use @aibtc/mcp-server, Claude doesn't have a wallet. Here's the smooth onboarding flow:

Example Conversation

You: What's your wallet address?

Claude: I don't have a wallet yet. Would you like to assign me one?
        I can either create a fresh wallet or you can import an existing one.

You: Create a new wallet called "agent-wallet"

Claude: What password should I use to protect the wallet?

You: use "secure123password"

Claude: I now have a wallet! My address is ST1ABC...XYZ

        IMPORTANT: Please save this recovery phrase securely:
        "word1 word2 word3 ... word24"

        This phrase will NOT be shown again. It's the only way to recover
        the wallet if the password is forgotten.

You: Send 10 STX to ST2DEF...

Claude: Done! I've sent 10 STX to ST2DEF...
        Transaction: 0x123...

Wallet States

| State | What Claude Says | What To Do | |-------|-----------------|------------| | No wallet | "I don't have a wallet yet" | Use wallet_create or wallet_import | | Locked | "My wallet is locked" | Use wallet_unlock with password | | Ready | "My address is ST..." | Claude can perform transactions |

Session Management

• By default, the wallet auto-locks after 15 minutes
• You can change this with wallet_set_timeout (set to 0 to disable)
• Use wallet_lock to manually lock the wallet
• Use wallet_unlock when you need Claude to transact again

Wallet Storage

Claude's wallets are stored locally on your machine:

~/.aibtc/
├── wallets.json       # Wallet index (names, addresses - no secrets)
├── config.json        # Active wallet, settings
└── wallets/
    └── [wallet-id]/
        └── keystore.json  # Encrypted mnemonic (AES-256-GCM + Scrypt)

Security:

• AES-256-GCM encryption with Scrypt key derivation
• Password required to unlock
• Mnemonics never stored in plaintext
• File permissions set to owner-only (0600)

Bitcoin L1 Support

Each wallet automatically derives both a Stacks address and a Bitcoin address from the same mnemonic using BIP39/BIP32 standards.

Derivation Paths (BIP84):

• Mainnet: m/84'/0'/0'/0/0 (Bitcoin coin type 0)
• Testnet: m/84'/1'/0'/0/0 (Bitcoin testnet coin type 1)

Address Format:

• Mainnet: bc1q... (Native SegWit P2WPKH)
• Testnet: tb1q... (Native SegWit P2WPKH)

Capabilities:

• Full Bitcoin L1 transaction support (send BTC)
• Balance and UTXO queries via mempool.space API
• Fee estimation (fast/medium/slow)
• P2WPKH (native SegWit) transactions for optimal fees

Example:

You: Create a wallet called "my-wallet"
Claude: I've created a wallet with:
        Stacks address: ST1ABC...
        Bitcoin address: bc1q...

You: Send 50000 sats to bc1q...
Claude: Done! Transaction broadcast: abc123...

Both addresses are derived from the same recovery phrase, making it easy to manage both Layer 1 (Bitcoin) and Layer 2 (Stacks) assets.

Available Tools (150+ total)

Wallet Management

| Tool | Description | |------|-------------| | wallet_create | Create a new wallet for Claude | | wallet_import | Import an existing wallet for Claude | | wallet_unlock | Unlock Claude's wallet | | wallet_lock | Lock Claude's wallet | | wallet_list | List Claude's available wallets | | wallet_switch | Switch Claude to a different wallet | | wallet_delete | Delete a wallet | | wallet_export | Export wallet mnemonic | | wallet_status | Check if Claude's wallet is ready (includes Stacks and Bitcoin addresses) | | wallet_set_timeout | Set how long wallet stays unlocked |

Bitcoin L1

| Tool | Description | |------|-------------| | get_btc_balance | Get BTC balance (total, confirmed, unconfirmed) | | get_btc_fees | Get fee estimates (fast, medium, slow) | | get_btc_utxos | List UTXOs for an address | | transfer_btc | Send BTC to a recipient | | get_cardinal_utxos | UTXOs safe to spend (no inscriptions) | | get_ordinal_utxos | UTXOs containing inscriptions |

Mempool Watch (Bitcoin)

| Tool | Description | |------|-------------| | get_btc_mempool_info | Get current Bitcoin mempool statistics (tx count, vsize, fees, fee histogram) | | get_btc_transaction_status | Get confirmation status and details for a Bitcoin transaction by txid | | get_btc_address_txs | Get recent transaction history for a Bitcoin address (last 25 transactions) |

Bitcoin Inscriptions

| Tool | Description | |------|-------------| | get_taproot_address | Get wallet's Taproot (P2TR) address | | estimate_inscription_fee | Calculate inscription cost | | inscribe | Create inscription commit transaction | | inscribe_reveal | Complete inscription reveal transaction | | get_inscription | Fetch inscription content from reveal tx | | get_inscriptions_by_address | List inscriptions owned by address |

PSBT & Ordinals Trading

| Tool | Description | |------|-------------| | psbt_create_ordinal_buy | Build a buyer-side PSBT for ordinal purchase | | psbt_sign | Sign selected PSBT inputs with active wallet keys | | psbt_decode | Decode PSBT inputs/outputs/signature status | | psbt_broadcast | Finalize and broadcast a fully-signed PSBT |

Message Signing

| Tool | Description | |------|-------------| | sip018_sign | Sign structured Clarity data (SIP-018) | | sip018_verify | Verify SIP-018 signature | | sip018_hash | Compute SIP-018 hash without signing | | stacks_sign_message | Sign plain text (SIWS-compatible) | | stacks_verify_message | Verify Stacks message signature | | btc_sign_message | Sign with Bitcoin key (BIP-137) | | btc_verify_message | Verify BIP-137 signature |

Wallet & Balance

| Tool | Description | |------|-------------| | get_wallet_info | Get Claude's wallet addresses (Stacks + Bitcoin) and status | | get_stx_balance | Get STX balance for any address | | get_stx_fees | Get STX fee estimates (low, medium, high) |

STX Transfers

| Tool | Description | |------|-------------| | transfer_stx | Send STX to a recipient | | broadcast_transaction | Broadcast a pre-signed transaction |

sBTC Operations

| Tool | Description | |------|-------------| | sbtc_get_balance | Get sBTC balance | | sbtc_transfer | Send sBTC | | sbtc_initiate_withdrawal | Initiate sBTC peg-out to BTC L1 | | sbtc_withdraw | Alias for withdrawal initiation | | sbtc_withdrawal_status | Check withdrawal request status | | sbtc_get_deposit_info | Get BTC deposit instructions | | sbtc_deposit | Build, sign, and broadcast BTC→sBTC deposit | | sbtc_deposit_status | Check deposit status via Emily API | | sbtc_get_peg_info | Get peg ratio and TVL |

Token Operations (SIP-010)

| Tool | Description | |------|-------------| | get_token_balance | Get balance of any SIP-010 token | | transfer_token | Send any SIP-010 token | | get_token_info | Get token metadata | | list_user_tokens | List tokens owned by an address | | get_token_holders | Get top holders of a token |

NFT Operations (SIP-009)

| Tool | Description | |------|-------------| | get_nft_holdings | List NFTs owned by an address | | get_nft_metadata | Get NFT metadata | | transfer_nft | Send an NFT | | get_nft_owner | Get NFT owner | | get_collection_info | Get NFT collection details | | get_nft_history | Get NFT transfer history |

Stacking / PoX

| Tool | Description | |------|-------------| | get_pox_info | Get current PoX cycle info | | get_stacking_status | Check stacking status | | stack_stx | Lock STX for stacking | | extend_stacking | Extend stacking period |

BNS Domains (V1 + V2)

| Tool | Description | |------|-------------| | lookup_bns_name | Resolve .btc domain to address | | reverse_bns_lookup | Get .btc domain for an address | | get_bns_info | Get domain details | | check_bns_availability | Check if domain is available | | get_bns_price | Get registration price | | list_user_domains | List domains owned | | preorder_bns_name | Preorder a .btc domain (step 1 of 2) | | register_bns_name | Register a .btc domain (step 2 of 2) |

Smart Contracts

| Tool | Description | |------|-------------| | call_contract | Call a smart contract function | | deploy_contract | Deploy a Clarity smart contract | | get_transaction_status | Check transaction status | | call_read_only_function | Call read-only function |

DeFi - ALEX DEX (Mainnet)

Uses the official alex-sdk for swap operations. Supports simple token symbols like "STX", "ALEX".

| Tool | Description | |------|-------------| | alex_list_pools | Discover all available trading pools | | alex_get_swap_quote | Get expected output for a token swap | | alex_swap | Execute a token swap (SDK handles routing) | | alex_get_pool_info | Get liquidity pool reserves |

DeFi - Zest Protocol (Mainnet)

Supports 10 assets: sBTC, aeUSDC, stSTX, wSTX, USDH, sUSDT, USDA, DIKO, ALEX, stSTX-BTC

| Tool | Description | |------|-------------| | zest_list_assets | List all supported lending assets | | zest_get_position | Get user's supply/borrow position | | zest_supply | Supply assets to earn interest | | zest_withdraw | Withdraw supplied assets | | zest_borrow | Borrow against collateral | | zest_repay | Repay borrowed assets |

DeFi - Bitflow DEX (Mainnet)

DEX aggregator that routes trades across multiple liquidity sources.

Units: Bitflow tools default to human units (amountUnit: "human"). Pass "2" to swap 2 STX, not "2000000". Set amountUnit: "base" only when working with raw on-chain integers. See Units & Decimals guide for details and common pitfalls.

| Tool | Description | |------|-------------| | bitflow_get_ticker | Get market data (no API key needed) | | bitflow_get_quote | Get swap quote | | bitflow_swap | Execute token swap |

Pillar Smart Wallet

sBTC smart wallet with Zest Protocol integration and passkey authentication.

| Tool | Description | |------|-------------| | pillar_connect | Connect to Pillar wallet | | pillar_send | Send sBTC to BNS names or addresses | | pillar_boost | Create leveraged sBTC position | | pillar_position | View wallet and Zest position |

For autonomous agents, use pillar_direct_* tools (no browser needed).

Blockchain Queries

| Tool | Description | |------|-------------| | get_account_info | Get account nonce, balance | | get_account_transactions | List transaction history | | get_block_info | Get block details | | get_mempool_info | Get pending transactions | | get_contract_info | Get contract ABI and source | | get_contract_events | Get contract event history | | get_network_status | Get network health status |

Yield Hunter (Autonomous)

| Tool | Description | |------|-------------| | yield_hunter_start | Start autonomous sBTC→Zest deposits | | yield_hunter_stop | Stop yield hunting | | yield_hunter_status | Check yield hunter status | | yield_hunter_configure | Adjust threshold, reserve, interval |

x402 API Endpoints

| Tool | Description | |------|-------------| | list_x402_endpoints | Discover x402 endpoints | | execute_x402_endpoint | Execute x402 endpoint with auto-payment | | scaffold_x402_endpoint | Generate x402 Cloudflare Worker project | | scaffold_x402_ai_endpoint | Generate x402 AI API with OpenRouter |

Usage Examples

Wallet management:

"What's your wallet address?" "Create a wallet for yourself" "Unlock your wallet" "Keep your wallet unlocked for 1 hour"

Check balances:

"How much STX do you have?" "What's your sBTC balance?"

Transfer tokens:

"Send 2 STX to ST1PQHQKV0RJXZFY1DGX8MNSNYVE3VGZJSRTPGZGM" "Transfer 0.001 sBTC to muneeb.btc"

NFTs:

"What NFTs do you own?" "Send this NFT to alice.btc"

BNS domains:

"What address is satoshi.btc?" "Is myname.btc available?"

DeFi trading (mainnet):

"What pools are available on ALEX?" "Swap 0.1 STX for ALEX" "Get a quote for 100 STX to ALEX" "What assets can I lend on Zest?" "Supply 100 stSTX to Zest" "Borrow 50 aeUSDC from Zest" "Check my Zest position"

x402 endpoints:

"Get trending liquidity pools" "Tell me a dad joke"

Supported Tokens

Well-known tokens can be referenced by symbol:

• sBTC - Native Bitcoin on Stacks
• USDCx - USD Coin on Stacks
• ALEX - ALEX governance token
• wSTX - Wrapped STX

ALEX DEX tokens: STX, ALEX, and any token from alex_list_pools

Zest Protocol assets: sBTC, aeUSDC, stSTX, wSTX, USDH, sUSDT, USDA, DIKO, ALEX, stSTX-BTC

Or use any SIP-010 token by contract ID: SP2X...::token-name

Configuration

| Environment Variable | Description | Default | |---------------------|-------------|---------| | NETWORK | mainnet or testnet | mainnet (installer) / testnet (if unset) | | API_URL | Default x402 API base URL | https://x402.biwas.xyz | | CLIENT_MNEMONIC | (Optional) Pre-configured mnemonic | - | | HIRO_API_KEY | (Optional) Hiro API key for higher rate limits | - | | SPEND_LIMIT_ENABLED | Set false to disable the wallet spending limit | true | | SPEND_LIMIT_DAILY_USTX / SPEND_LIMIT_SESSION_USTX | STX spend cap per day / per unlock (micro-STX) | 10000000 (10 STX) | | SPEND_LIMIT_DAILY_SATS / SPEND_LIMIT_SESSION_SATS | BTC spend cap per day / per unlock (sats) | 50000 |

Note on NETWORK: The --install command writes NETWORK=mainnet by default (pass --testnet to use testnet). If you omit NETWORK from your config entirely, the runtime fallback is testnet. Most users should set this explicitly.

Note on spending limits: A default-on safety rail meters every outbound spend (transfer_stx, transfer_btc, x402/L402 auto-payments) against a cumulative per-session and per-day cap, so a single bad instruction or a malicious endpoint can't drain the wallet. A spend over the cap is blocked and reports the remaining budget. Raise the caps via the env vars above, or disable with SPEND_LIMIT_ENABLED=false. See SECURITY.md.

Note: CLIENT_MNEMONIC is optional. The recommended approach is to let Claude create its own wallet. HIRO_API_KEY is optional but recommended for production use — without it, you may hit Hiro's public rate limits (429 responses). Get a key at platform.hiro.so.

Architecture

You ←→ Claude ←→ aibtc-mcp-server
                        ↓
              Claude's Wallet (~/.aibtc/)
                        ↓
              ┌─────────┴─────────┐
              ↓                   ↓
        Hiro Stacks API    x402 Endpoints
              ↓                   ↓
        Stacks Blockchain  Paid API Services

Security Notes

• Claude's wallet is stored encrypted on YOUR machine
• Password is never stored - only the encrypted keystore
• Mnemonics shown only once at creation
• Auto-lock after 15 minutes (configurable)
• Transactions signed locally before broadcast
• Spending limit (default-on): outbound spends are capped per session and per day so a single bad instruction can't drain the wallet — see Configuration
• Secret-scanning pre-commit hook: contributors get a hook (auto-installed via npm install) that blocks committing a seed phrase or private key
• For mainnet: Fund with small amounts first

See SECURITY.md for the full wallet-key protection model and key-leak recovery steps.

Advanced: Pre-configured Mnemonic

For automated setups where Claude needs immediate wallet access, add the CLIENT_MNEMONIC environment variable to your MCP server config (in ~/.claude.json for Claude Code, or claude_desktop_config.json for Claude Desktop):

{
  "mcpServers": {
    "aibtc": {
      "command": "npx",
      "args": ["@aibtc/mcp-server@latest"],
      "env": {
        "CLIENT_MNEMONIC": "your twenty four word mnemonic phrase",
        "NETWORK": "testnet"
      }
    }
  }
}

This bypasses the wallet creation flow - Claude has immediate access to transact.

Agent Skill

This package includes an Agent Skills compatible skill that teaches any LLM how to use the Bitcoin wallet capabilities effectively.

What is it?

The aibtc-bitcoin-wallet skill provides:

• Structured workflows for Bitcoin L1 operations (balance, send, fees)
• Reference guides for Pillar smart wallets and Stacks L2 DeFi
• LLM-agnostic instructions that work with Claude Code, Cursor, Codex, and 20+ other tools

Using the Skill

The skill is automatically included when you install the MCP server. Find it at:

• Local: node_modules/@aibtc/mcp-server/skill/SKILL.md
• ClawHub: clawhub.ai/skills - search for aibtc-bitcoin-wallet

Skill Structure

skill/
├── SKILL.md                        # Bitcoin L1 core workflows
└── references/
    ├── genesis-lifecycle.md        # Agent registration & check-in
    ├── inscription-workflow.md     # Bitcoin inscription guide
    ├── pillar-wallet.md            # Pillar smart wallet guide
    ├── stacks-defi.md              # Stacks L2 / DeFi operations
    └── troubleshooting.md          # Common issues and solutions

Development

git clone https://github.com/aibtcdev/aibtc-mcp-server.git
cd aibtc-mcp-server
npm install
npm run build
npm run dev       # Run with tsx (development)

Releases

This repo uses Release Please for automated releases:

1. Merge PRs with conventional commits (feat:, fix:, etc.)
2. Release Please creates a Release PR with changelog
3. Merge the Release PR to publish

Repository Secrets (Maintainers)

| Secret | Description | |--------|-------------| | NPM_TOKEN | npm publish token for @aibtc scope | | CLAWHUB_API_TOKEN | ClawHub API token for skill publishing |

To obtain a ClawHub API token, visit clawhub.ai and create an account.

License

MIT