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DNSBL IP Reputation Lookup
x402
DNSBL IP Reputation Lookup is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Checks an IP address against multiple DNS-based blocklists (DNSBLs) to determine its spam/abuse reputation and which blocklists it appears on.
Price / call$0.002
Success—
StatusUnknown
How this service works
Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.
Output
Returns a JSON object containing the queried IP address, an array of DNSBL zones checked (each with zone name, listing status, and result code), and a summary list of zone names where the IP is actively listed.
Example use cases
Email deliverability pre-flight check
“Before I send out this email campaign, can you check if our mail server IP 203.0.113.45 is on any DNSBL blacklists that might cause our messages to be blocked?”
Investigating suspicious inbound traffic
“We're getting a lot of suspicious requests from IP 91.108.4.10 — can you check its reputation and tell me if it's listed on any spam or abuse blocklists?”
Postmaster blocklist audit
“I need to audit our IP 198.51.100.22 and find out exactly which DNS blocklist zones it's currently listed in, especially Spamhaus and Barracuda.”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/dnsbl-ip-reputation?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, multi-zone DNSBL reputation check for a specific IP address — especially for email deliverability audits, spam source investigation, or network security workflows. It covers multiple major blocklist zones (including Spamhaus and Barracuda) in a single call and requires no API key, making it ideal for pay-per-use agent workflows where you only pay $0.002 USDC per lookup.
Side effects
- Invalid or malformed IP address returns an error response
- IP not found in any zone returns empty listed_zones array
- Unreachable DNSBL zone may show null code with unlisted status
- Payment failure (402) if USDC balance insufficient on Base
- Rate limiting or timeout if upstream DNSBL resolvers are slow
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ip": "2.0.0.127",
"zones": [
{
"code": null,
"zone": "zen.spamhaus.org",
"listed": false
}
],
"listed_zones": [
"barracuda"
]
}
}Tags
x402
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