SentinelGateway vs. Helicone
Observability without the data leak.
The numbers that matter at production scale
The Helicone Catch-22.
Choose Option A — Helicone's cloud proxy — and every prompt your users send travels through a third-party server before reaching your LLM provider. You gain a dashboard, but you accept a 50–80ms network hop on every single request, and your raw prompts live on infrastructure you do not control. For teams with any HIPAA, SOC 2, or GDPR obligation, this is a non-starter.
Choose Option B — self-host Helicone for privacy — and you must orchestrate a four-container stack: the main application server, a ClickHouse analytics database, an authentication service, and a mailer. Each component needs its own monitoring, patching cycle, and on-call rotation. SentinelGateway takes a different position: a single compiled Go binary that runs completely local to your VPC. Audit logs, PII scrubbing, semantic caching, and latency tracking are not sidecar services — they are the binary, executing in the same process, adding ~13ms and zero network hops.
No credit card required. 10,000 free tokens.
Feature-by-Feature Breakdown
Every capability that matters at production scale, compared row by row.
Gateway overhead
Latency added per request
Performance under load
Latency profile at production RPS
Data privacy model
Where your prompts physically travel
PII scrubbing (built-in)
Cards, SSNs, emails — before LLM call. Per NIST SP 800-122 & NIST IR 8053.
Prompt injection blocking
Jailbreak / DAN pattern detection
Secret / credential scanning
AWS keys, GitHub tokens, PEM keys
Deployment footprint
What you run in production
Infrastructure overhead
Ongoing ops burden
OpenAI wire-format compatibility
Drop-in base_url replacement
Per-request audit log
Raw + redacted prompts, side by side
Semantic prompt cache
Dedup repeat prompts, zero token cost
Multi-provider routing
OpenAI, Anthropic, Gemini, Groq
Automatic fallback on 429/5xx
Transparent retry on transient errors
Multi-tenant key isolation
One API key per tenant, K8s NetworkPolicy
Metered billing (Stripe)
Token-level cost tracking, hourly sync
BYOK (Bring Your Own Keys)
Enterprise: inject own provider keys
One line. Your data stays put.
If you're using Helicone's header injection today, migrating to SentinelGateway means swapping one endpoint. Your existing OpenAI SDK calls, LangChain chains, or LlamaIndex queries need zero modification. You gain PII scrubbing, semantic caching, and fallback routing — all running inside your own VPC.
- No SDK changes. No new dependencies.
- Free tier: 10,000 tokens, no credit card.
- Prompts never leave your infrastructure.
# Before: Helicone header proxy
from openai import OpenAI
client = OpenAI(
base_url="https://oai.helicone.ai/v1",
default_headers={"Helicone-Auth": key}
)
# After: SentinelGateway — air-gapped, no headers
from openai import OpenAI
client = OpenAI(
base_url="https://api.sentinelgateway.ai/v1",
api_key="sg-..."
)
✓ PII scrubbing active — prompts stay local
✓ Fallback routing active
✓ Semantic cache active
Technical Standards & References
- [1] National Institute of Standards and Technology. NIST Special Publication 800-122: Guide to Protecting the Confidentiality of Personally Identifiable Information (PII). U.S. Department of Commerce, April 2010.
- [2] National Institute of Standards and Technology. NIST Interagency Report 8053: De-identification of Personal Information. U.S. Department of Commerce, October 2015.
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