What Is Stable Domains? The Agent-First Domain Registrar (Pay in USDC/USDT)

StableDomains (StableDomains.net) is an agent-first domain registrar. You search for a name, register a real domain and pay in USDC or USDT stablecoins on seven chains: Base, Ethereum, Arbitrum, Polygon, HyperEVM, BNB Chain and Solana.

There's no account to create. You can buy as a guest and there are no card forms. WHOIS privacy is free wherever the registry allows it.

The site is built for software as much as for people. AI agents can search, get a quote and register through three interfaces: the REST API, the MCP server (so an assistant can call StableDomains as a tool), or x402 pay-per-request in USDC, where payment travels with the HTTP request itself.

This short is the 15-second overview. If you want to see the whole flow end to end, the related guide walks through how an AI agent buys a domain. The API docs cover the endpoints, the MCP server and x402 in more detail, and the pay-with pages include a price table per TLD, so you can check before you or your agent pay. Guest checkout, stablecoin payment and agent access all come from one registrar, which is what agent-first means here.