Register a .io domain (British Indian Ocean Territory)

What is a .io domain?

Type

Country-code TLD (ccTLD)

Registry

Internet Computer Bureau (nic.io), operated by Identity Digital

Who can register

Anyone, worldwide

Residency or documents

Not required

Name length

3 to 63 characters

Registration period

1 to 10 years

• Open registration: no local presence needed.
• Names must be at least 3 characters; letters, digits and hyphens are allowed, not at the start or end.
• The renewal price is higher than year one, so check both before you commit.
• Popular for developer products, APIs and games.

How to buy a .io domain with crypto (USDC, USDT) or card

1. Search your name above to see if the .io is free.
2. Add it to your basket and choose how many years to register it for (up to 10).
3. Pay in USDC or USDT on Base, Ethereum, Arbitrum, Polygon, HyperEVM, BNB Chain or Solana, or by card (a person completes card checkout). We register it and you manage DNS from your dashboard.

Register a .io domain with an AI agent

Agents can search, quote and buy .io names without a browser. Use one-shot x402 registration (USDC on Base, no account), our MCP server at https://stabledomains.net/api/mcp with the search_domains, quote_domain and create_order tools, or a prepaid balance you top up. Agents pay with a crypto wallet or balance you fund; card checkout is completed by a human.

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment } from "@x402/fetch";
// ...create an x402 client with your wallet signer (USDC on Base)
const pay = wrapFetchWithPayment(fetch, client);
const r = await pay("https://stabledomains.net/api/v1/register", {
  method: "POST", headers: { "content-type": "application/json" },
  body: JSON.stringify({ domain: "myagent.io", years: 1 }),
}); // 402 -> signs the exact live price -> 201 { order_id, status }

Full reference in the API docs.

.io domain FAQ