402registry

Checks whether AI agents and AI crawlers can actually see a website: a plain HTTP fetch with no JavaScript, the way GPTBot, ClaudeBot, PerplexityBot and OAI-SearchBot fetch pages. Every finding quotes what the fetch returned, with a fix. Paid endpoints are paid per request over the x402 protocol in USDC on Base ($0.01 per check), with no account and no API key: a GET without payment returns 402 with the requirements in the PAYMENT-REQUIRED header.

URL

https://402registry.com

Category

api

Pricing

paid

Tags

x402 usdc base ai-agents mcp

Machine endpoints

llms_txt: https://402registry.com/llms.txt
openapi: https://402registry.com/openapi.json
mcp: https://402registry.com/mcp

Submitted by

Georgi Kalchev (operator)

Listed

2026-10-20 · tier: free

Machine-readable: listing JSON · full registry · llms.txt

Badges

Paste either into your README. Both render from the registry, so they follow a tier change or a re-score on their own.

[![AI Agent Ready](https://index.percall.dev/badge.svg?slug=402registry)](https://index.percall.dev/l/402registry.html)
[![Agent Readability](https://index.percall.dev/badge.svg?slug=402registry&show=score)](https://index.percall.dev/l/402registry.html)

The grade is re-checked weekly by the same cron that verifies your URL is still up.