# FHI Domain Change Evidence API

> FHI Domain Change Evidence API is a paid API for AI agents from polished-truth-c514.fhi-llc-1118.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Retrieves evidence of historical ownership or configuration changes for a given domain name

## Facts

- Endpoint: POST https://polished-truth-c514.fhi-llc-1118.workers.dev/api/v1/domain-change-evidence?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fhi-domain-change-evidence-api-933927a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eg6LeLpQXx3aUOnTiyE2O

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 fhi-domain-change-evidence-api-933927a3 -d '<json body>'
```

Example prompt: Can you pull up any evidence of ownership or configuration changes for the domain 'example.com' — I want to know if it changed hands or had major DNS changes recently?

## When to prefer this

Choose this endpoint when you need to investigate whether a specific domain has changed ownership, DNS configuration, or registrar over time — particularly for security research, pre-acquisition due diligence, phishing investigation, or brand protection. It is purpose-built for domain change evidence retrieval and is priced per-call at $0.02 USDC via x402 on Base mainnet, making it suitable for autonomous agent workflows that need on-demand domain intelligence without subscription overhead.

## Known failure modes

- Domain not found or no evidence available — may return empty results
- Invalid domain format — returns validation error
- Payment failure via x402 — request rejected before processing
- Network or worker timeout — transient error requiring retry
- Domain with no recorded change history — empty or minimal response

## How this service works

Stateful remote-MCP change evidence, payable per call with x402 Base USDC.

## Output

Returns structured evidence of historical changes associated with the given domain, which may include ownership transfer records, DNS configuration changes, registrar change events, or other signals indicating the domain's history has been altered. Useful for due diligence, security research, and brand protection.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "description": "Public DNS name, such as example.com"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "domain": "example.com",
  "changed": true,
  "evidence": {
   "a": [
    "93.184.216.34"
   ],
   "caa": [],
   "aaaa": [],
   "certificates": []
  },
  "monitoring": {
   "state": "change_detected",
   "signals": [
    "dns_a_changed"
   ]
  },
  "firstObservation": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fhi-domain-change-evidence-api-933927a3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from polished-truth-c514.fhi-llc-1118.workers.dev](https://www.zero.xyz/host/polished-truth-c514.fhi-llc-1118.workers.dev/llms.txt)