Leaderboard/captcha.cc Human Verification
MCP ServerScored via MCP protocol probing: initialize handshake, tools/list conformance, and ping + tool invocation performance.

captcha.cc Human Verification

captcha.cc/docs/mcp↗|v1.0.0

Human verification CAPTCHA with visual and selective-listening audio challenges.

57/100
Operational Score
Score Breakdown
Availability30/30
Conformance10/30
Performance17/40
Key Metrics
Uptime 30d
100.0%
P95 Latency
292.6ms
Conformance
Fail
Trend
Stable
What's Being Tested
Availability
HTTP health check to the service endpoint
Responded with HTTP 200 in 292ms
Conformance
MCP initialize handshake + tools/list
MCP initialize handshake failed
Performance
MCP ping + zero-arg tool invocation benchmarking
P95 latency: 292ms, task completion: 0%
Improvement Tips
  • -Fix MCP initialize handshake errors
Recent Probe Results
TimestampStatusLatencyConformance
May 27, 2026success292.6msPartial
May 27, 2026success153msPartial
May 27, 2026success192.9msPartial
May 26, 2026success199.9msPartial
May 25, 2026success263.5msPartial
May 22, 2026success174.4msPartial
May 22, 2026success170.4msPartial
May 21, 2026success199.3msPartial
May 20, 2026success66.7msPartial
May 18, 2026success158msPartial
Source Registries
mcp-registry
First Seen
Apr 13, 2026
Last Seen
May 28, 2026
Last Probed
May 27, 2026