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Private APIs for safer LLM products

Ylemis

A trust layer for AI apps: prompt-injection screening today, PII and hallucination checks next, served through private metered APIs you can put in front of agents, RAG, and automations.

Test your API key View API shape
Live Stesh Guard API CPU no GPU required Private keys and quotas

Trust layer suite

Start with the input firewall.

Ylemis is built as a set of narrow, auditable services that sit around your LLM workflows.

01

Stesh Guard

Multilingual prompt-injection and jailbreak detection with long-document windowing, quotas, and private API keys.

Live now
02

PII Guard

Detect and redact sensitive data before prompts, logs, tickets, or emails reach downstream tools.

Next
03

GroundCheck

Evidence-aware checks for generated claims, RAG answers, and customer-facing AI responses.

Planned

API console

Score a prompt with your key.

Paste a Stesh Guard key and send a request to the live API. Keys stay in your browser session and are never stored by this site.

Ready.

Plans

Private access while the platform grows.

Billing checkout and dashboard are being wired next. Early customers can start with issued API keys.

Starter

$49/mo

For prototypes, audits, and small production workflows.

  • 50k requests / month
  • Prompt-injection scoring
  • Email support
Request Starter

Pro

$149/mo

For teams putting a guardrail in front of live LLM features.

  • 500k requests / month
  • Batch endpoint
  • Threshold tuning support
Request Pro

Scale

Custom

For higher-volume teams, self-hosted deployments, and custom evaluation.

  • 5M+ requests / month
  • Private deployment options
  • Evaluation report
Talk to us

Developer shape

One request before your LLM call.

Use the decision band to block, review, or allow input before it reaches your agent or model.

curl https://api.ylemis.com/v1/score \
  -H "X-API-Key: $YLEMIS_KEY" \
  -H "Content-Type: application/json" \
  -d '{"text":"<user or tool content>"}'