BIMI Checker
Checks whether a website's email branding setup is correct so its logo shows up in inboxes. Checks one or more website addresses to see if they are properly set up to show a brand logo next to emails in inboxes like Gmail, Apple Mail, and Yahoo. It looks up the special settings the domain has published, checks that the logo picture follows the required format, checks that a security certificate for the logo (if any) is valid and not expired, and confirms the domain has strict enough email protection rules turned on. It returns a clear pass or fail for each domain along with a plain list of what is broken if something fails. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /check.
This API exposes 1 operation across 1 path, and defines 6 schemas. It is described by OpenAPI 3.1.0, at version 1.0.0.
Requests are made against a single base URL, https://bimi-checker.underscoredone.com.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 1
BIMI Checker declares
1 security scheme
for authenticating requests.
An API key is passed in the header as SIGN-IN-WITH-X (siwx).
siwx— CAIP-122 wallet signature for repeat access after payment
Paths & Operations 1
Across 1 path, the API surfaces 1 operation — 1 POST. Each is listed below with its method, path, parameters, and response codes.
Schemas 6
The contract defines 6 schemas that model the data the API accepts and returns. The most detailed are ValidationError (5 properties), DomainResult (5 properties), DomainCheckDetail (4 properties), Response (3 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
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