---
title: "Passive DNS and reputation for a domain or IP"
method: POST
path: "/v1/payg/ip-intel"
tags: ["x402 pay-per-call"]
---

# Passive DNS and reputation for a domain or IP

`POST /v1/payg/ip-intel`

## Request

- Base URL: `https://api.relayshield.net`
- URL: `https://api.relayshield.net/v1/payg/ip-intel`
- Auth: none required

Look up passive DNS resolution history and reputation for a domain or IP address. For a domain: which IPs it has resolved to over time. For an IP: which hostnames have resolved to it, plus malicious/suspicious vendor detection counts. Call to pivot from an indicator to its infrastructure history during an investigation.

**Billing.** $0.10 in USDC per call over x402, on Base or Solana. No API key, no signup and no
subscription. Send the request with no payment header, take the `402` challenge that comes back,
pay it, and repeat the request. Only successful calls are charged.

## Request body

- object
  - `domain` string: Domain to look up (returns reputation + passive DNS resolution history)
  - `ip` string: Alternative: IP address to look up (returns reputation + reverse passive DNS)

## Response `200`

Payment settled and the check ran. `ok` is true and `data` holds the result.

- object
  - `ok` true, required
  - `data` object, required

## Other responses

- `400`: A required field is missing or malformed. Never billed.
- `402`: Payment required. The body carries a complete x402 version 2 challenge with the accepted networks, the amount in USDC base units, and the recipient. Pay it and repeat the request with the payment header.
- `405`: Wrong HTTP method. Every endpoint is POST.

---

[API](https://skmtc.dev/relayshield/apis/relayshield-api.md) · [All operations](https://skmtc.dev/relayshield/apis/relayshield-api/llms.txt) · [OpenAPI document](https://skmtc.dev/relayshield/apis/relayshield-api/revisions/4d4721b936dd?raw)