Free Domain Registration API — Search, Check & Register Domains

Building a domain registrar, SaaS with custom domains, or an AI agent that needs to register domains? The Frostbyte Domains API lets you search availability across 18 TLDs, check pricing, and register domains programmatically — all through a clean REST interface.

This guide covers every endpoint: domain availability search, TLD listing, pricing, and registration. Perfect for building white-label domain tools, portfolio managers, or automating domain purchases for your platform.

Quick Start — Search Domain Availability

# Search domain availability across TLDs
curl -H "x-api-key: YOUR_KEY" \
  "https://agent-gateway-kappa.vercel.app/v1/frostbyte-domains/v1/domains/search?query=myproject"

{
  "query": "myproject",
  "results": [
    {"domain": "myproject.com", "available": false, "tld": ".com"},
    {"domain": "myproject.dev", "available": true, "tld": ".dev", "price": "$12.99"},
    {"domain": "myproject.io", "available": true, "tld": ".io", "price": "$29.99"},
    {"domain": "myproject.xyz", "available": true, "tld": ".xyz", "price": "$1.99"},
    {"domain": "myproject.app", "available": true, "tld": ".app", "price": "$11.99"}
  ]
}

import requests

BASE = "https://agent-gateway-kappa.vercel.app/v1/frostbyte-domains"
headers = {"x-api-key": "YOUR_KEY"}

# Search for available domains
resp = requests.get(
    f"{BASE}/v1/domains/search",
    params={"query": "myproject"},
    headers=headers
)

for result in resp.json()["results"]:
    status = "Available" if result["available"] else "Taken"
    print(f"{result['domain']}: {status}")

const BASE = "https://agent-gateway-kappa.vercel.app/v1/frostbyte-domains";
const headers = { "x-api-key": "YOUR_KEY" };

const resp = await fetch(
  `${BASE}/v1/domains/search?query=myproject`,
  { headers }
);
const { results } = await resp.json();

results.forEach(d => {
  console.log(`${d.domain}: ${d.available ? 'Available' : 'Taken'}`);
});

API Endpoints

All endpoints are accessed via the gateway at https://agent-gateway-kappa.vercel.app/v1/frostbyte-domains. Authentication via x-api-key header is required.

List Available TLDs

# Get all supported TLDs with pricing
curl -H "x-api-key: YOUR_KEY" \
  "https://agent-gateway-kappa.vercel.app/v1/frostbyte-domains/v1/domains/tlds/list"

{
  "tlds": [
    {"tld": ".com", "price": "$9.99", "renewal": "$12.99"},
    {"tld": ".net", "price": "$10.99", "renewal": "$12.99"},
    {"tld": ".org", "price": "$8.99", "renewal": "$12.99"},
    {"tld": ".io", "price": "$29.99", "renewal": "$34.99"},
    {"tld": ".dev", "price": "$12.99", "renewal": "$14.99"},
    {"tld": ".xyz", "price": "$1.99", "renewal": "$9.99"},
    ...
  ],
  "count": 18
}

Register a Domain

# Register an available domain
curl -X POST "https://agent-gateway-kappa.vercel.app/v1/frostbyte-domains/v1/domains/register" \
  -H "x-api-key: YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "domain": "myproject.xyz",
    "years": 1,
    "nameservers": ["ns1.example.com", "ns2.example.com"]
  }'

{
  "success": true,
  "domain": "myproject.xyz",
  "registrationId": "dom_abc123",
  "expiresAt": "2027-03-04T00:00:00Z",
  "nameservers": ["ns1.example.com", "ns2.example.com"],
  "cost": "$1.99"
}

import requests

BASE = "https://agent-gateway-kappa.vercel.app/v1/frostbyte-domains"
headers = {
    "x-api-key": "YOUR_KEY",
    "Content-Type": "application/json"
}

# Register a domain
resp = requests.post(
    f"{BASE}/v1/domains/register",
    headers=headers,
    json={
        "domain": "myproject.xyz",
        "years": 1,
        "nameservers": ["ns1.example.com", "ns2.example.com"]
    }
)

result = resp.json()
print(f"Registered: {result['domain']}")
print(f"Expires: {result['expiresAt']}")

Use Cases

AI Agent Domain Acquisition

Build autonomous agents that find and register relevant domains based on trends, brand names, or project requirements. Combine with the Web Search API to discover trending terms and auto-register matching domains.

SaaS Custom Domains

Let your SaaS customers register custom domains directly from your platform. Search availability, show pricing, and complete registration without leaving your app.

Domain Portfolio Manager

Build tools that monitor domain availability, track expiration dates, and manage renewals across your entire portfolio via API calls.

White-Label Registrar

Create your own domain registration service using the API as a backend. Add your own branding, pricing, and billing on top.

Supported TLDs

Pricing

Domain availability searches cost 1 credit ($0.001) per query. Domain registration costs are per-TLD (see table above) plus 3 credits ($0.003) per API call. You get 200 free credits when you create an API key — enough for 200 availability checks.

Payment options: USDC top-up (500 credits/$1), x402 micropayments (USDC on Base), or Monero (XMR).

Compared to Alternatives

FAQ

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