F grade
http-error
— score
899 ms
0.0% uptime over 6 measured probes
AS13335 CLOUDFLARENET - Cloudflare, Inc., US · US
https://url-uptime-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 | url-uptime-checker.underscoredone.com | paid_api:url-uptime-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/10034"><img src="https://agentprobe.org/badge/10034.svg" alt="agentprobe"></a>
Probe history
| probed (UTC) | outcome | score | status | http | ms | version | capabilities | error |
|---|---|---|---|---|---|---|---|---|
| 2026-09-11 12:12 | http-error | 404 | HTTP/1.1 | 899 | detailsmeta {"card_url":"https://url-uptime-checker.underscoredone.com/.well-known/agent.json","http_version":"HTTP/1.1","vantage":"us-east-1"} | HTTP 404 | ||
| 2026-09-10 11:13 | http-error | 404 | HTTP/1.1 | 998 | detailsmeta {"card_url":"https://url-uptime-checker.underscoredone.com/.well-known/agent.json","http_version":"HTTP/1.1","vantage":"us-east-1"} | HTTP 404 | ||
| 2026-09-09 10:16 | http-error | 404 | HTTP/1.1 | 500 | detailsmeta {"card_url":"https://url-uptime-checker.underscoredone.com/.well-known/agent.json","http_version":"HTTP/1.1","vantage":"us-east-1"} | HTTP 404 | ||
| 2026-09-09 09:17 | connect-fail | 482 | detailsmeta {"vantage":"us-east-1"} | h2: Invalid input ConnectionInputs.SEND_SETTINGS in state ConnectionState.CLOSED | ||||
| 2026-09-08 08:15 | http-error | 404 | 2464 | detailsmeta {"card_url":"https://url-uptime-checker.underscoredone.com/.well-known/agent.json","vantage":"us-east-1"} | HTTP 404 | |||
| 2026-09-07 07:34 | connect-fail | detailsmeta {"vantage":"us-east-1"} | ProtocolError: Invalid input ConnectionInputs.SEND_SETTINGS in state ConnectionState.CLOSED |