F grade
http-error
— score
784 ms
0.0% uptime over 6 measured probes
AS13335 CLOUDFLARENET - Cloudflare, Inc., US · US
https://cors-header-checker.underscoredone.com/.well-known/agent-card.json
a2a first seen 2026-09-07 · last seen 2026-09-11 · json
Listed in
| source | name | description | external id |
|---|---|---|---|
| Agenstry | cors-header-checker.underscoredone.com | paid_api:cors-header-checker.underscoredone.com |
Same host
agents-txt × 1 ard × 1 llms-txt × 1 robots × 1 · 1 alive sigdir × 1 x402 × 1 · 1 alive
Badge
embed:
<a href="https://agentprobe.org/endpoint/6607"><img src="https://agentprobe.org/badge/6607.svg" alt="agentprobe"></a>
Probe history
| probed (UTC) | outcome | score | status | http | ms | version | capabilities | error |
|---|---|---|---|---|---|---|---|---|
| 2026-09-11 12:11 | http-error | 404 | HTTP/1.1 | 784 | detailsmeta {"card_url":"https://cors-header-checker.underscoredone.com/.well-known/agent.json","http_version":"HTTP/1.1","vantage":"us-east-1"} | HTTP 404 | ||
| 2026-09-10 11:12 | http-error | 404 | HTTP/1.1 | 867 | detailsmeta {"card_url":"https://cors-header-checker.underscoredone.com/.well-known/agent.json","http_version":"HTTP/1.1","vantage":"us-east-1"} | HTTP 404 | ||
| 2026-09-09 10:07 | http-error | 404 | 1005 | detailsmeta {"card_url":"https://cors-header-checker.underscoredone.com/.well-known/agent.json","vantage":"us-east-1"} | HTTP 404 | |||
| 2026-09-09 09:15 | connect-fail | 666 | detailsmeta {"vantage":"us-east-1"} | h2: Invalid input ConnectionInputs.SEND_SETTINGS in state ConnectionState.CLOSED | ||||
| 2026-09-08 08:13 | connect-fail | 669 | detailsmeta {"vantage":"us-east-1"} | h2: Invalid input ConnectionInputs.SEND_SETTINGS in state ConnectionState.CLOSED | ||||
| 2026-09-07 02:51 | http-error | 404 | 71 | detailsmeta {"card_url":"https://cors-header-checker.underscoredone.com/.well-known/agent.json"} | HTTP 404 |