Helicone
./MonitorOne-line proxy for LLM logging, caching, rate limits, and cost analytics
MCPOpenAPIllms.txt
$ protocol support
$ payment protocols
none documented — this service is not reachable over an agent payment protocol
$ agent access
authAPI Key
onboardingFull — agent can self-onboard
tosExplicitly welcomes bots
webhooksYes
free tierYes
billingsubscription
#observability#proxy#caching#open-source
https://www.helicone.ai
// last verified 8/26/2026
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