Yarnhen OAuth API
OAuth 2.1 for MCP clients: register, send the account owner to approve in the browser, and exchange the code for scoped tokens. For the client and the human, not agent tools.
Yarnhen OAuth API is one of 5 APIs that Yarnhen publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include OAuth and Authentication. The published artifact set on APIs.io includes an OpenAPI specification.
This API exposes 6 operations across 6 paths, and defines 7 schemas. It is described by OpenAPI 3.2.0, at version 0.1.0.
Requests are made against 4 base URLs: https://yawplet.com, https://yarnhen.com, https://hagglebee.com, https://eventwren.com.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 2
Yarnhen OAuth API declares
2 security schemes
for authenticating requests.
It accepts HTTP bearer tokens (apiKey).
It supports OAuth 2.0 (oauth2) using the authorizationCode flow, exposing 5 scopes.
By default, every request must be authenticated.
apiKey— API key from POST /v1/accounts. Not scoped: full access to its account.oauth2— OAuth 2.1 for MCP clients: authorization code with PKCE (S256 only), public clients registered with RFC 7591, opaque access tokens (one hour) and rotating refr…
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.
OAuth 2.1 for MCP clients: register, send the account owner to approve in the browser, and exchange the code for scoped tokens. For the client and the human, not agent tools.
Schemas 7
The contract defines 7 schemas that model the data the API accepts and returns. The most detailed are OAuthTokenRequest (8 properties), OAuthClient (8 properties), Error (6 properties), OAuthClientRegistration (5 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from Yarnhen 4
Other APIs Yarnhen publishes across the network.
This is an independent, third-party profile of Yarnhen OAuth 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.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
·
Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and
you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.