All endings / .si
Register a .si domain (Slovenia)
.si is the country-code ending for Slovenia. It is short, open to registrants worldwide and reads naturally for Slovenian brands, "si" word plays and names that end in -si. You can buy a .si domain with crypto (USDC or USDT) or by card here.
$33.59 for year one · renews at the same $33.59/yr · WHOIS privacy free
Type a name like myagent.si; we check it live and show every other ending we sell alongside it. Pay in USDC, USDT or by card.
What is a .si domain?
- Type
- Country-code TLD (ccTLD) for Slovenia
- Registry
- Arnes (Academic and Research Network of Slovenia), register.si
- Who can register
- Individuals and organisations in Slovenia or abroad
- Residency or documents
- Not required
- Name length
- 2 to 63 characters
- Registration period
- 1 to 5 years, renewable
- A free name goes to whoever applies earliest, through an accredited registrar.
- Allowed: letters a-z, digits and hyphens, plus permitted IDN characters such as č, š and ž (e.g. roža.si).
- A name may not start or end with a hyphen, and may not have hyphens in both the 3rd and 4th positions unless it is a valid IDN (xn--) string.
- Some names are reserved by the registry, e.g. 112.si, 113.si, si.si and rs.si.
How to buy a .si domain with crypto (USDC, USDT) or card
- Search your name above to see if the .si is free.
- Add it to your basket and choose how many years to register it for (up to 10).
- 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 .si domain with an AI agent
Agents can search, quote and buy .si 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.si", years: 1 }),
}); // 402 -> signs the exact live price -> 201 { order_id, status }Full reference in the API docs.
Watch: Registering a .si domain
.si domain FAQ
Can I register a .si domain if I don't live in Slovenia?
Yes. The .si registry accepts individuals and organisations from Slovenia or abroad, and no local presence or documents are required.
Can I buy a .si domain with crypto?
Yes. You can buy a .si domain with crypto, paying in USDC or USDT stablecoins, or pay by card. Bitcoin and other coins are not accepted. Agents pay in USDC on Base over x402.
How much does a .si domain cost?
A .si domain costs $33.59 for year one; renews at the same $33.59/yr, paid in USDC, USDT or by card. The price is re-checked live before you pay. WHOIS privacy is included free.
How long can I register a .si domain for?
The registry allows registration periods of 1 to 5 years, and you can renew before expiry.
Can my AI agent register a .si domain by itself?
Yes, over our REST API with x402 (USDC on Base) or through our MCP server. The agent pays from a crypto wallet or prepaid balance you fund; card payments are made by a human at checkout.
Who runs the .si registry?
Arnes, the Academic and Research Network of Slovenia, operates the .si registry at register.si.
Can I use special characters like č, š or ž?
Yes, .si supports internationalised domain names with the characters on the registry's allowed list.
Registry rules summarised from: Register.si general terms (Arnes), Register.si: registering a domain. See all prices.