---
title: "Live domain availability check (RDAP, WHOIS fallback)"
method: GET
path: "/api/v1/check"
tags: ["Availability"]
---

# Live domain availability check (RDAP, WHOIS fallback)

`GET /api/v1/check`

## Request

- Base URL: `https://www.tlders.com`
- URL: `https://www.tlders.com/api/v1/check`
- Auth: one of:
  - HTTP bearer
  - API key in header `X-API-Key`

## Query parameters

- `domain` string, required

## Response `200`

OK

- object
  - `data` object
    - `domain` string
    - `available` boolean, nullable: `null` when the registry could not be reached
    - `registrar` string, nullable
    - `expires` string, date-time, nullable

## Other responses

- `400`: A required parameter is missing or invalid
- `401`: Missing, invalid or revoked API key
- `402`: Endpoint needs a paid plan (free keys: 100 requests/month, no bulk /prices)
- `429`: Daily request limit exceeded (see Retry-After)

---

[API](https://skmtc.dev/tlders/apis/tlders-domain-pricing-api.md) · [All operations](https://skmtc.dev/tlders/apis/tlders-domain-pricing-api/llms.txt) · [OpenAPI document](https://skmtc.dev/tlders/apis/tlders-domain-pricing-api/revisions/d24ebbcf6fd2?raw)