Resolution Service API

The Resolution Service provides an API for getting domain data and metadata regardless of the blockchain in which the domain is stored. The service caches blockchain events in a database for easy retrieval without accessing any blockchain APIs.

With the Resolution Service API, you can quickly build applications directly communicating with the blockchain to get UD domain data with a single API request. For example, the Web3 Domain Resolution Demo was built using the Resolution Service API.

Supported Domains Endings

The Resolution Service API supports decentralized domains across two main zones:

Name Service	Supported Domains
Zilliqa Name Service (ZNS)	`.zil`
Unstoppable Name Service (UNS)	`.crypto`, `.nft`, `.blockchain`, `.bitcoin`, `.wallet,` `.888`, `.dao`, `.x`, `.klever`, `.hi`, `.kresus`, `.polygon`

important

Unstoppable Domains periodically adds new domain endings, and our Resolution libraries and APIs are designed to detect and support them automatically. This means you do not need to implement a front-end filter in your application (e.g., by hard-coding specific domains or using a regex filter for only .crypto, .nft, etc.). We also provide an API endpoint to query for supported domain endings.

Getting Started With the Resolution Service

Acquire an API Key

Before you can make any request to the Resolution Service API, you must acquire an API key from Unstoppable Domains. Please email partnerengineering@unstoppabledomains.com to request an API key for your integration.

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The API key provided by Unstoppable Domains is free to acquire (no cost to open source projects). However, storing the keys in a secret manager or environment variables for open-source projects like other third-party APIs is advisable.

Authenticate Your Requests

The Resolution Service API uses Bearer Tokens to authorize requests with the API key gotten from Unstoppable Domains.

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

Fork Our Postman Collection

Unstoppable Domains offers a Postman collection that you can easily import into your workspace to quickly interact with the Resolution Service API.

API Endpoints Spec

Below is a table of all the API endpoints provided by the Resolution Service, a description of their function, and links to their respective documentation. For more details about the endpoints, see the Resolution Service endpoint specification.

Endpoint	Description	Documentation
Domain Endpoints
Get Records for a Domain	returns all the records attached to a domain name.	Get Records for a Domain Docs
Get Records for Multiple Domains	returns all the records attached to multiple domain names.	Get Records for Multiple Domains Docs
Get Records for Owner Addresses	returns all the domain names, records, and metadata owned by a wallet address or configured to a resolution record.	Get Records for Owner Addresses Docs
Get Domain Transfer Events	returns the transfer history of a domain name.	Get Domain Transfers Docs
Reverse Endpoints
Get Reverse Record for an Address	returns the reverse record of a wallet address.	Get Reverse Record for an Address Docs
Get Reverse Record for Multiple Addresses	returns the reverse record of multiple wallet addresses.	Get Reverse Record for Multiple Addresses Docs
TLDs Endpoints
Get Supported TLDs	returns all the domain endings supported by Unstoppable Domains.	Get Supported TLDs Docs
Metadata Endpoints
Get Metadata for a Domain	returns the ERC721 metadata information of a domain name.	Get Metadata for a Domain Docs
Get Domain SVG Image	returns the image data of a domain name as a SVG string.	Get Domain SVG Image Docs
Get Domain Image Source	returns the image data of a domain name in `image/svg+xml` format.	Get Domain Image Source Docs

Rate Limits

The rate limits for the Resolution Service endpoints are as follows:

20 requests per IP per second for metadata endpoints
20 requests per IP per second for other endpoints

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When the rate limit is exceeded, a status code of 429 will be returned.

Self-hosting the Resolution Service

The Resolution Service can be installed, configured, and self-hosted locally and in the cloud. Unstoppable Domains provides the Resolution Service as a docker image so it can be launched on various platforms. Please see the Resolution Service installation guide for steps on running a self-hosted version of the service.

Asking For Help

If you are experiencing difficulties using our services, please know that we are here to help. You can join our Discord Community for real-time support from UD and the community, where you can receive assistance with integrating your app