Fibx MCP Server

FibX

A command-line tool for DeFi operations on Base, Citrea, HyperEVM, and Monad, powered by Fibrous aggregation and Privy Server Wallets.

Features

• Multi-Chain Support: Base, Citrea, HyperEVM, and Monad
• Portfolio: Cross-chain portfolio overview with USD valuations and DeFi positions
• Token Swaps: Optimal routing via Fibrous aggregation with auto-slippage
• Transfers: Send ETH or any ERC-20 token
• Aave V3: Supply, borrow, repay, withdraw, and browse markets on Base
• MCP Server: Built-in AI agent integration for Cursor, Claude Desktop, and Antigravity (11 tools, 4 categories)
• Agent Skills: Prompt-based AI skills via fibx-skills
• Privy Server Wallets: Server-side signing — the CLI receives signed transaction payloads or signatures, not Privy app credentials or raw keys
• Policy-Enforced Signing: Configured chain allowlists and native-value caps are evaluated by Privy at signing time
• Private Key Import: Use an existing wallet with AES-256-GCM encrypted local storage
• Preflight Checks: Transaction flows validate or estimate execution where the underlying RPC supports it
• Dry‑Run Mode: --simulate previews write operations without broadcasting; gas estimates are included where available
• JSON Output: --json flag for scripting and pipelines
• Zero-Dependency Install: Single-file bundle via tsup — npx fibx runs near-instantly

Supported Chains

Installation

Run directly with npx (no install needed):

npx fibx status

Or install globally:

npm install -g fibx

Requirements

• Node.js >= 18
• A running fibx-server instance (required for Privy wallet operations; not needed for private key imports)

Quick Start — First Swap in 3 Minutes

Step 1: Get a Price Quote (no auth needed)

Try FibX instantly — no sign-up, no wallet, no keys:

npx fibx quote 0.01 ETH USDC              # Check price on Base
npx fibx quote 100 USDC DAI --chain base   # Compare pairs
npx fibx quote 0.5 MON USDC --chain monad  # Check Monad prices

Step 2: Authenticate (pick one)

Option A — Email Login (Privy Server Wallet, no keys to manage):

npx fibx auth login you@email.com          # Sends OTP to your email
npx fibx auth verify you@email.com 123456  # Verify & create wallet

Option B — Import Private Key (use an existing wallet):

npx fibx auth import                       # Paste your key (encrypted at rest)

Step 3: Execute

npx fibx trade 0.01 ETH USDC               # Execute the swap
npx fibx balance                            # Check your balances

That's it. Three steps from zero to first swap.

Usage

Authentication

# Email OTP (uses Privy server wallet)
npx fibx auth login user@example.com
npx fibx auth verify user@example.com 123456

# Or import a private key (local signing, no server needed)
npx fibx auth import

# Check session status
npx fibx status

# Logout
npx fibx auth logout

Security: When using auth import, your private key is encrypted at rest with AES-256-GCM. The encryption key is auto-generated per machine and stored in the OS config directory (e.g. ~/.config/fibx-nodejs/encryption-key on Linux). You can also set the FIBX_SESSION_SECRET environment variable for CI/Docker environments.

Global Options

Balance

npx fibx balance
npx fibx balance --chain citrea

Portfolio

Consolidated cross-chain portfolio view with USD valuations:

npx fibx portfolio           # Table output across all chains
npx fibx portfolio --json    # Structured JSON for scripting

Shows all token holdings across Base, Citrea, HyperEVM, and Monad with USD values. Includes DeFi positions (Aave V3 collateral/debt) and total portfolio net worth. Token prices are sourced live from Fibrous.

Send

npx fibx send 0.001 0xRecipient           # Send native token on Base (ETH)
npx fibx send 10 0xRecipient USDC         # Send ERC-20 on Base
npx fibx send 1 0xRecipient --chain monad # Send MON on Monad
npx fibx send 0.1 0xRecipient --simulate  # Preview without sending

Quote

Get swap prices without authentication:

npx fibx quote 0.01 ETH USDC                  # Price check on Base
npx fibx quote 1 MON USDC --chain monad         # Check Monad prices
npx fibx quote 0.1 ETH USDC --json             # JSON output for scripts

No wallet or authentication required. Use quote to explore prices, then trade to execute.

Swap

npx fibx trade <amount> <from> <to>
npx fibx trade 0.0001 ETH USDC
npx fibx trade 20 USDC DAI
npx fibx trade 1 MON USDC --chain monad
npx fibx trade 0.1 ETH USDC --simulate   # Preview without broadcasting

Options: --slippage <n> (default: 0.5%), --approve-max, --simulate, --json

Note: The trade command automatically detects Wrap (Native -> Wrapped) and Unwrap (Wrapped -> Native) operations and executes them directly via contract calls, bypassing aggregator routing to save gas.

Transaction Status

npx fibx tx-status <hash>
npx fibx tx-status 0x123...abc --chain monad

Wallet Info

npx fibx address    # Print active wallet address
npx fibx wallets    # Show active wallet details

Aave V3 (Base)

npx fibx aave status               # Account health
npx fibx aave markets              # List all active reserves with APY & TVL
npx fibx aave supply 1 ETH         # Auto-wraps ETH -> WETH and supplies
npx fibx aave supply 100 USDC      # Supply ERC-20
npx fibx aave borrow 50 USDC       # Borrow
npx fibx aave repay 50 USDC        # Repay
npx fibx aave repay max ETH        # Auto-wraps ETH and repays full WETH debt
npx fibx aave withdraw max ETH     # Withdraws WETH and auto-unwraps to ETH
npx fibx aave supply 1 ETH --simulate  # Preview without broadcasting

Note: supply, repay, and withdraw support automatic ETH <-> WETH wrapping/unwrapping on Base.

Configuration

Set custom RPC URLs to avoid rate limits on public endpoints:

npx fibx config set-rpc base https://mainnet.base.org
npx fibx config get-rpc base
npx fibx config reset-rpc base   # Reset single chain to default
npx fibx config reset-rpc        # Reset all chains to default
npx fibx config list

Hot-reload: Config changes are picked up automatically — no need to restart the CLI or MCP server.

AI Agent Integration

MCP Server

fibx includes a built-in MCP server for AI editors like Cursor, Claude Desktop, and Antigravity. See MCP.md for setup and available tools.

npx fibx mcp-start

The MCP server exposes 11 tools across 4 categories (Auth & Config, Wallet & Portfolio, Trading, DeFi). All write operations support a simulate=true preview that does not broadcast; gas estimates are returned only where available.

Agent Skills

For prompt-based agent integration (Claude Code, Cursor, etc.), see the fibx-skills repository.

Security

Letting an AI agent operate a wallet requires controls outside the model. fibx combines signing-layer policies, server-side validation, client hints, and explicit previews. These controls reduce risk, but the server credentials, MCP client configuration, and deployment policy remain part of the trust boundary:

Wallet policy limits are configured per deployment — see the fibx-server wallet policy docs.

Note: policies are attached when a wallet is created. Wallets provisioned before policies were introduced keep signing without them until migrated.

Architecture

This repository is the CLI and MCP server. Three sibling repositories complete the stack:

src/
├── commands/           # CLI commands (auth, trade, send, aave, config)
├── mcp/                # Modular MCP server
│   ├── server.ts       # Entry point + MCP_INSTRUCTIONS
│   ├── tools/          # Tool registrations (auth, wallet, trade, defi)
│   └── handlers/       # Tool implementations
├── services/           # Business logic (chain, fibrous, auth, defi, portfolio)
└── lib/                # Shared utilities (errors, fetch, format, crypto)

Development

pnpm install
pnpm dev          # run the CLI from source
pnpm test         # vitest unit tests
pnpm typecheck    # tsc --noEmit
pnpm lint         # eslint
pnpm build        # tsup bundle to dist/

Related Links

• Fibrous Finance — DEX aggregator powering swaps
• npm package

License

MIT