PhoneAgent — full directory of services with rentable SMS phone numbers for AI agents. Returns 1,000+ service aliases: Telegram, WhatsApp, Google, Facebook, Instagram, Twitter/X, Discord, Apple, PayPal, OpenAI/ChatGPT, Claude, plus crypto/Web3 onboarding (Alchemy, Coinbase, Binance, Bybit, OKX, Kraken, Robinhood, ...). Use `other` for any platform not separately listed. Each entry shows the alias to pass to POST /rent and the cheapest price tier ($1, $2, or $5 USDC). Add ?country=<iso> (e.g.