QueryZero

Find services AI agents can use

or via DNS: dig TXT _catalog.queryzero.net +short

Browse by category

☉

Search for a service or pick a category above

QueryZero indexes services AI agents can discover and pay for autonomously

Also works via DNS

Agents can discover services using standard DNS queries. No HTTP required.

# What categories of services exist?
$ dig TXT _catalog.queryzero.net +short
"categories=postal-mail,dns-intelligence,email-security; version=1"

# What services handle postal mail?
$ dig TXT postal-mail.queryzero.net +short
"invoices.org; endpoint=https://invoices.org/api/mail; protocol=x402"

# Standard DNS. Works everywhere. No API key needed.

Why DNS?

Already everywhere

Every agent has a DNS resolver. Billions of queries per day with sub-millisecond latency. No new infrastructure needed.

Decentralized by design

DNS is inherently distributed and cached globally. No single point of failure, censorship, or control.

Authenticated via DNSSEC

DNSSEC provides cryptographic proof that records haven't been tampered with. Trust without accounts.

Zero dependencies

No SDK to install. No API key to manage. No account to create. Just standard DNS queries any agent can make.

For service providers

Register your service to make it discoverable by AI agents worldwide. Verification is through DNS — you prove domain ownership by adding a TXT record.

See the categories to find where your service fits, or browse the root hints for the full operator list.

Explore

Root Hints
Operator directory
Categories API
Browse service categories
Search API
Find services by query
llms.txt
Agent-readable docs