evm-rpc-picker 0.1.1

A TUI tool to search for EVM chains, manage favorites securely, and select RPC URLs.

EVM RPC Picker

A powerful TUI (Terminal User Interface) tool to search for EVM chains and manage your RPC URLs securely. It helps you quickly select and set the ETH_RPC_URL environment variable with the fastest available RPC, whether it's public, private, or project-specific.

Features

• Instant Search: Filter over 1000+ chains by name or Chain ID.
• Latency Checks: Real-time ping (using eth_blockNumber) to find the most responsive RPC.
• Custom RPC Management: Add, edit, and manage your own RPC endpoints for any chain.
• Secure Storage: Encrypt sensitive RPC URLs and store API keys securely in your system's Keyring.
• Smart Context Detection: Automatically detects networks and URLs defined in your foundry.toml or hardhat.config.js.
• Favorites System:
  • Project Level: Store favorites in .rpc-picker.toml within your repository.
  • Global Level: Store favorites in your global user config.
  • Favorite RPCs: Bookmark both public chains and your own custom RPCs to easily access and test them from a dedicated unified dashboard.
• Filtering:
  • Toggle between Mainnet, Testnet, or All.
  • Quickly filter to show only your Favorite chains.
• Notes: Attach notes to your custom RPCs — stored as plain text (public) or AES-encrypted and portable inside the config file (private, when password-protected).
• Sensitive Mode: Toggle Ctrl + S to instantly mask all sensitive URLs and notes for screen sharing or streaming. Also available via --privacy / -p CLI flag.

Installation

Ensure you have uv installed.

# Run directly without installation
uvx evm-rpc-picker

One-Off Command Execution

If you only want to select an RPC for a single command without modifying your current shell's ETH_RPC_URL environment variable, you can pass the output of evm-rpc-picker directly as a subshell argument:

# Run cast block-number with a freshly selected RPC
cast block-number --rpc-url $(uvx evm-rpc-picker)

Shell Integration

Add the following function to your .bashrc or .zshrc to easily export the selected RPC:

pick-rpc() {
    local rpc=$(uvx evm-rpc-picker)
    [ -n "$rpc" ] && export ETH_RPC_URL="$rpc"
}

After restarting your shell, simply run pick-rpc to pick and export the RPC.

Since ETH_RPC_URL is now exported to your environment, all Foundry commands (cast, forge) will automatically pick it up without requiring manual --rpc-url parameters:

# Query the current block number using cast
cast block-number

Python Usage

You can also use evm-rpc-picker as a module in your own Python scripts:

from evm_rpc_picker import pick_rpc

# This will open the TUI
rpc_url = pick_rpc()

if rpc_url:
    print(f"Selected RPC: {rpc_url}")

Keyboard Shortcuts

Main Screen

Key	Action
Tab	Switch Focus (Table ↔ Personal RPCs ↔ Env Status)
Enter	Select highlighted chain to see RPCs
Ctrl + F	Filter Favorites toggle
Ctrl + T	Filter Network Type (All ↔ Mainnet ↔ Testnet)
Ctrl + L	Toggle Local Favorite (Project level)
Ctrl + G	Toggle Global Favorite (Global level)
Ctrl + R	Refresh chain data from network
Ctrl + E	Use Current ETH_RPC_URL (select current ENV and exit)
Ctrl + U	Personal RPC URLs (manage and select custom endpoints)
Ctrl + B	Favorite RPCs (view all bookmarked public and custom endpoints)
Ctrl + S	Toggle Sensitive Mode (mask all URLs and notes for screen sharing)

Chainlist.org chain's RPC Selection Screen

Key	Action
Enter	Select RPC and exit
Esc	Back to main screen
Ctrl + R	Refresh latencies
Ctrl + L	Toggle Local Favorite (Project level)
Ctrl + G	Toggle Global Favorite (Global level)

Personal RPC URLs Screen

Key	Action
Enter	Select RPC and exit
Esc	Back to main screen
a	Add custom RPC
e	Edit highlighted RPC
Delete	Delete highlighted RPC
Ctrl + V	Paste & Add (paste URL from clipboard into Add RPC modal)
Ctrl + B	Toggle Favorite (bookmark/unbookmark the selected custom RPC)

Favorite RPCs Screen

Key	Action
Enter	Select RPC and exit
Esc	Back to main screen
Ctrl + R	Refresh latencies
Ctrl + L	Toggle Local Favorite (Project level)
Ctrl + G	Toggle Global Favorite (Global level)

Add/Edit Custom RPC Modal

Key	Action
Ctrl + S	Save changes (when editing)
Ctrl + G	Add Globally (when adding)
Ctrl + L	Add Locally (when adding)
Esc	Cancel

Sensitive Mode (Streamer / Over-Shoulder Protection)

Sensitive Mode lets you instantly hide all sensitive RPC URLs and notes without closing the application — useful when sharing your screen, streaming, or recording.

Activation

Method	Command
Runtime toggle	Ctrl + S on the main screen
CLI flag	evm-rpc-picker --privacy or evm-rpc-picker -p

What gets masked

Element	Normal display	Sensitive Mode
URL with API key	https://mainnet.infura.io/v3/mykey	https://mainnet.infura.io/••••••••
URL with credentials	https://user:[e-mail]/key	https://••••••••@rpc.example.com/••••••••
RPC note	my personal note	••••••••

The host/domain remains visible so you can still identify the provider. When Sensitive Mode is active, the header subtitle changes to [🙈] Sensitive Mode (displayed in red).

Note: Sensitive Mode is display-only. Selecting an RPC still returns the real URL to the shell.

Configuration

• Global Config: ~/.config/evm-rpc-picker/config.toml
• Project Config: .rpc-picker.toml in your project root.
• Cache: Data from chainlist.org is cached for 24 hours in ~/.cache/evm-rpc-picker/chains.json.

Secure Storage & Encryption

Zero-Prompt AES-GCM Hybrid Encryption

The application features a secure, industrial-grade hybrid encryption system designed to protect your private RPC endpoints and personal notes without ruining the developer experience:

• Unencrypted Custom RPCs: Standard custom RPCs store their URLs and notes in plain-text inside the config.toml or .rpc-picker.toml configuration files.
• Password-Protected (Encrypted) Custom RPCs:
  • If password protection is enabled, the entire URL and the note are individually encrypted using AES-256-GCM (via cryptography).
  • The encrypted payloads are saved directly inside the TOML configuration file as inline tables (url_encrypted and note_encrypted). This makes your configuration fully portable across different machines.
  • To prevent having to type your password repeatedly, the password is automatically registered in your system's secure credential vault (macOS Keychain, Windows Credential Manager, or Linux Secret Service via keyring).
  • Zero-Prompt UX: When selecting, editing, or performing background latency checks on an encrypted RPC, the app silently queries the keyring. If the credentials are present, it unlocks the endpoint instantly without prompting the user. If the credentials are missing, a secure password prompt modal will ask you for it and automatically persist it back to the keyring.

Security Visual Indicators

• Lock Icon [🔒]: Displayed in front of password-protected RPCs in both the Personal RPCs and Favorite RPCs dashboards.
• Privacy Masking (Ctrl + S): When Sensitive/Privacy Mode is active:
  • For unlocked encrypted RPCs, the decrypted URL and note are masked display-only (e.g., displaying [🔒] https://mainnet.infura.io/•••••••• and ••••••••).
  • For locked encrypted RPCs, both values remain completely hidden behind the secure [🔒] Locked placeholder.

Development

git clone https://github.com/radeksvarz/evm-rpc-picker.git
cd evm-rpc-picker
uv sync

# Run normally
uv run evm-rpc-picker

Hot Reloading (TUI Development)

For TUI development with hot reloading, open two terminals.

Terminal 1 (Console output):

uv run textual console

Terminal 2 (App with hot reload):

uv run textual run --dev evm_rpc_picker.tui:ChainRPCPicker

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