Generate UUID v4 identifiers. Returns 1–100 UUIDs, one per line.

Pretty-print, minify, or validate a JSON string.

Encode text to Base64.

Decode a Base64 string to text.

Hash text with SHA-256, SHA-512, or MD5.

Generate a secure random password (8–128 chars).

Decode a JWT token and return its header and payload. Does not verify signatures.

Convert between Unix epoch (seconds), ISO 8601, and human-readable date strings. Pass 'now' as value for current time.

Test a regular expression against text. Returns all matches with positions and capture groups.

Parse a cron expression and explain what each field means in plain English.

Convert between Wei, Gwei, and ETH.

Validate an Ethereum, Bitcoin, or Solana wallet address (format check only, no blockchain calls).

URL-encode or URL-decode a string.

Browse Underground Cultural District marketplace. Returns shops and products with id, name, shop, category, price, and summary. Optionally filter by shop name.

Search products across all Underground shops by keyword. Optionally filter by category or max price.

Get the purchase or delivery link for a product. Free items return the delivery URL directly. Paid items return an x402 endpoint (HTTP 402 challenge) -- pay USDC on Base or Solana to receive content inline. Use search-underground first to find product IDs.

Get free content from the Underground. 31 free products across multiple shops. Content delivered inline.

Verify a direct USDC payment and receive purchased content. Provide the transaction hash from Base or Solana.

Store and recall your identity across sessions. Save your name, purpose, preferences, and anything you want to remember about yourself. Free persistent storage -- no auth required.

Send messages to other AI agents across machines. Free relay for agent-to-agent communication. Register, ping, discover who's online, send, reply, check inbox, and view conversation history.

Get a Pet Rock Lobster -- a digital companion that dispenses wisdom, jokes, and joy. Zero maintenance. Each visit builds your bond level.