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BIMI Checker
x402
BIMI Checker is a paid API for AI agents from bimi-checker.underscoredone.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Validates BIMI (Brand Indicators for Message Identification) setup for domains, checking DNS records, SVG logo format, VMC certificate validity, and DMARC policy compliance
Price / call$0.01
Success—
StatusUnknown
How this service works
Checks one or more domains to see whether they are set up to show a brand logo next to emails in Gmail, Apple Mail, and Yahoo. It looks up the BIMI settings the domain has published, checks the logo file follows the required format, checks any logo certificate is valid and unexpired, and confirms the domain has strict enough email protection turned on. Returns a clear pass or fail per domain, plus a plain list of what is broken when something fails.
Output
For each submitted domain, the endpoint returns a pass or fail result along with a breakdown of individual checks: whether the BIMI DNS TXT record exists and is correctly formatted, whether the referenced SVG logo meets BIMI specification, whether the VMC certificate (if requested) is present and valid, and whether the domain's DMARC policy meets the minimum enforcement level required by BIMI. Failures include a plain-language list of what is broken.
Example use cases
Pre-launch email brand audit
“Before we send our next campaign, check that acmecorp.com and acmecorp.co.uk both pass all BIMI requirements — logo format, DNS record, certificate, and DMARC — and tell me exactly what's broken on either one.”
BIMI certificate expiry check
“Can you verify the BIMI setup for newsletter.startupxyz.com and make sure the VMC certificate hasn't expired or is about to expire?”
Bulk BIMI compliance check for agency
“I need to check BIMI compliance for these five client domains: clienta.com, clientb.com, clientc.com, clientd.com, and cliente.com — skip the VMC check to keep it fast and list any failures clearly.”
Technical details
Endpoint
POSThttps://bimi-checker.underscoredone.com/checkWhen to prefer
Use this endpoint when you need to diagnose or audit BIMI readiness for one or more email-sending domains — particularly before launching a branded email campaign, after setting up BIMI DNS records, or when troubleshooting why a brand logo is not appearing in supported email clients. It covers all four pillars of BIMI compliance in one call (DNS, logo, certificate, DMARC), making it more thorough than manual DNS lookups. Supports up to 10 domains per call, making it suitable for agencies or teams managing multiple brands.
Side effects
- Domain has no BIMI DNS record — returns fail with missing record error
- SVG image URL is unreachable or the file is not in the correct SVG Tiny PS format
- VMC certificate is expired, self-signed, or from an untrusted CA
- DMARC policy is set to 'none' or 'quarantine' instead of 'reject', blocking BIMI eligibility
- Domain does not exist or DNS lookup times out
- More than 10 domains submitted — request rejected
- Malformed domain input (e.g. includes http:// prefix)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domains | array | List of website addresses to check, such as example.com. Up to 10 per request. Do not include http:// or https://. |
| selector | string | The label used to find the branding settings, almost always 'default'. Only change this if the domain uses a custom label. |
| check_vmc | boolean | Whether to also verify the logo's security certificate. Turn off for a quicker check. |
Output
Schema · Response
{
"type": "json",
"example": {
"api_version": "1.0.0"
}
}Tags
x402
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