# BIMI Checker

> 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

## Facts

- Endpoint: POST https://bimi-checker.underscoredone.com/check
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bimi-checker-be9c3cd8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1jMJ7e9w_C6QQJbV9ZDBY

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability bimi-checker-be9c3cd8 -d '<json body>'
```

Example prompt: Can you check if mybrand.com is properly set up for BIMI so our logo shows up in Gmail and Apple Mail inboxes — include the VMC certificate check too?

## When to prefer this

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.

## Known failure modes

- 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)

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domains": {
   "type": "array",
   "description": "List of website addresses to check, such as example.com. Up to 10 per request. Do not include http:// or https://."
  },
  "selector": {
   "type": "string",
   "description": "The label used to find the branding settings, almost always 'default'. Only change this if the domain uses a custom label."
  },
  "check_vmc": {
   "type": "boolean",
   "description": "Whether to also verify the logo's security certificate. Turn off for a quicker check."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "api_version": "1.0.0"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bimi-checker-be9c3cd8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bimi-checker.underscoredone.com](https://www.zero.xyz/host/bimi-checker.underscoredone.com/llms.txt)