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Unstoppable Domains marketplace API

Browse and search the Unstoppable Domains secondary marketplace. Retrieve paginated listings of domains available for purchase from existing owners, with filtering by TLD and sorting options.

Unstoppable Domains marketplace API is one of 33 APIs that Unstoppable Domains publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Marketplace. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API exposes 6 operations across 6 paths, and defines 12 schemas. It is described by OpenAPI 3.1.0, at version 3.0.0.

Requests are made against 2 base URLs: https://api.unstoppabledomains.com/partner/v3, https://api.ud-sandbox.com/partner/v3.

6 operations 6 paths 12 schemas 1 GET5 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
3.0.0
Base URL
https://api.unstoppabledomains.com/resolve
Authentication
HTTP Bearer
Resource Areas
1

Authentication & Security 1

Unstoppable Domains marketplace API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (JWT) (bearer). By default, every request must be authenticated.

Paths & Operations 6

Across 6 paths, the API surfaces 6 operations — 1 GET, 5 POST. Each is listed below with its method, path, parameters, and response codes.

marketplace 6

Browse and search the Unstoppable Domains secondary marketplace. Retrieve paginated listings of domains available for purchase from existing owners, with filtering by TLD and sort…

GET
/marketplace/domains/listings
List marketplace domain listings
getMarketplaceDomainsListings 6 params → 200400401403500
POST
/mcp/v1/actions/ud_listing_create
Create marketplace listings
listingCreate body → 200401
POST
/mcp/v1/actions/ud_listing_update
Update marketplace listings
listingUpdate body → 200401
POST
/mcp/v1/actions/ud_listing_cancel
Cancel marketplace listings
listingCancel body → 200401
POST
/mcp/v1/actions/ud_offers_list
List marketplace offers
offersList body → 200401
POST
/mcp/v1/actions/ud_offer_respond
Respond to marketplace offers
offerRespond body → 200401

Schemas 12

The contract defines 12 schemas that model the data the API accepts and returns. The most detailed are CreateListingResponse (6 properties), UpdateListingResponse (6 properties), RespondToOfferResponse (6 properties), MarketplaceDomainsListingItemResponse (6 properties). Each schema is shown below with its type and property counts.

MarketplaceDomainsListingItemResponse
object
6 properties 5 required
MarketplaceDomainsListingListPriceResponse
object
1 property 1 required
MarketplaceDomainsListingsResponse
object
2 properties 2 required
MarketplaceDomainsListingPayoutResponse
object
1 property 1 required
CreateListingResponse
object
6 properties
UpdateListingResponse
object
6 properties
ErrorResponse
object
Standard error response
3 properties 1 required
ListOffersResponse
object
4 properties
RespondToOfferResponse
object
6 properties
PaginatedListResponseNext
object
2 properties
CancelListingResponse
object
4 properties
MarketplaceDomainsListingOwnerResponse
object
1 property 1 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

unstoppable-domains-marketplace-api-openapi.yml Raw ↑

Other APIs Unstoppable Domains publishes across the network.

Unstoppable Domains account API
Unstoppable Domains AI Lander API
Unstoppable Domains Backorders API
Unstoppable Domains Cart API
Unstoppable Domains contacts API
Unstoppable Domains DNS Management API
Unstoppable Domains dns-records API
Unstoppable Domains domain-contacts API
Unstoppable Domains domain-flags API
Unstoppable Domains domain-management API
Unstoppable Domains domain_registration API
Unstoppable Domains domain-search API
Where this information came from

This is an independent, third-party profile of Unstoppable Domains marketplace API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

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