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Domain Name Availability Guide

The Partner API offers an endpoint that lets you check the availability of a domain name before purchase to avoid making minting calls to non-available domains. Partners can use this endpoint to implement a domain name search field in their application to shows users which domain names are available and the prices to purchase them.

Domain search field example

Domain search field example

Step 1: Retrieve Your Reseller ID and Secret API Token

To access your ResellerID and Secret API Token, you must navigate to your Sandbox or Production Partner dashboard. The ResellerID is used to identify the requests as coming from a Partner, while the Secret API Token is used for authentication to ensure that only authorized Partners can access the API.

Step 2: Prepare Authorization Headers

The Partner API uses bearer tokens to authorize requests with the Secret API Token from your Partner credentials.

Field Name Value
Security Scheme Type HTTP
HTTP Authorization Scheme bearer
Bearer Format a token provided by Unstoppable Domains

Step 3: Use the Domain Name Availability Endpoint

Send a GET request with the authorization headers you have prepared and the domain name you want to check to the Domain Name Availability endpoint. Here is the URL for our API environments:

Sandbox Environment:


Production Environment:


The PARTNER_RESELLERID path parameter is the same one you retrieved from your partner account earlier.


Here is an example request to check the availability of the buyadomain.dao domain before purchase:

curl --location --request GET 'https://api.ud-sandbox.com/api/v2/resellers/{PARTNER_RESELLERID}/domains/buyadomain.dao' \
--header 'Authorization: Bearer {SECRET_API_TOKEN}'
    "domain": {
        "id": 167892438,
        "name": "buyadomain.dao",
        "ownerAddress": null,
        "resolver": null,
        "resolution": {},
        "blockchain": "MATIC",
        "projectedBlockchain": "MATIC",
        "registryAddress": "0xa9a6a3626993d487d2dbda3173cf58ca1a9d9e9f",
        "networkId": 137,
        "freeToClaim": true,
        "node": "0xbaee34a867ed94387a307bf426ae01af9f4254f8c1dc2c633c577278df0d6454"
    "availability": {
        "registered": false,
        "protected": false,
        "price": 20,
        "availableForFree": false,
        "test": false

From the availability field in the API response, we can see the domain hasn't been registered and costs $20 to purchase.


You have successfully checked the availability of a domain name with the Partner API.

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