Observe, cache, and controlevery LLM call in production
WatchLLM is the infrastructure layer between your app and your LLM providers. Real-time observability, semantic caching, cost controls, and agent debugging—without changing your code.
Free tier · No credit card · 10k requests/mo
Works with every major LLM provider. Your keys, your billing, zero markup.
Platform Capabilities
Built for production AI systems
The infrastructure primitives you need to ship, scale, and operate LLM-powered applications with confidence.
Real-time Observability
Full visibility into every LLM call across your entire stack
- Request-level traces with latency breakdown
- Token usage and cost attribution per endpoint
- Live dashboard with anomaly detection
Agent Debugger
Step-through timeline with tool call replay for agentic workflows
- Multi-step tool call tracing
- Infinite loop detection and alerts
- Per-step cost and latency profiling
Semantic Cache
Sub-50ms responses for similar prompts with streaming support
- Vector-based similarity matching (>95% accuracy)
- Configurable TTL and cache invalidation
- Request deduplication and race protection
Security and Compliance
Enterprise-grade encryption with zero prompt storage on disk
- AES-256-GCM with PBKDF2 key derivation
- Full audit trail and GDPR compliance
- API key leak prevention and anomaly alerts
All capabilities are live in production today. Read the integration guide
Why WatchLLM
Everything you need to run LLMs in production
One proxy layer that gives you observability, caching, cost controls, and security across every provider. Ship faster, operate with confidence.
Real-time Traces
Every LLM call is traced with latency, token count, cost, and cache status. Stream data into your dashboard or export to your observability stack.
Agent Debugger
Step-through agentic workflows with tool call replay, loop detection, and per-step cost profiling. Debug multi-turn chains in minutes, not hours.
Semantic Caching
Vector-based similarity matching returns cached responses in under 50ms. Streaming-compatible with configurable TTL and automatic deduplication.
Cost Controls
Budget alerts, per-endpoint cost attribution, and verified pricing for 21+ models with 0% variance. Know exactly where every dollar goes.
Security and Audit
AES-256-GCM encryption, zero prompt storage on disk, GDPR compliance, and full audit trails. API key leak prevention built in.
Multi-provider Routing
OpenAI, Anthropic, Groq, and OpenRouter through a single endpoint. Switch providers with a header change. Your keys, your billing, no markup.
How It Works
Production-ready in 3 steps
No infrastructure changes. No migrations. Point your base URL at WatchLLM and start observing.
Point your base URL
Swap one line in your existing OpenAI/Anthropic code. Your API keys stay yours. WatchLLM never marks up provider costs.
const client = new OpenAI({
baseURL: "https://proxy.watchllm.dev/v1",
apiKey: process.env.OPENAI_API_KEY, // Your key
defaultHeaders: {
"X-WatchLLM-Key": process.env.WATCHLLM_API_KEY
}
});Every call is traced
WatchLLM logs latency, tokens, cost, and cache status for every request. Semantically similar prompts are matched via vector embeddings with >95% accuracy and served from cache in under 50ms.
// For every request WatchLLM automatically:
// 1. Traces latency, tokens, and cost
// 2. Vectorizes the prompt for cache lookup
// 3. Returns a cached response or forwards to the providerObserve and control
Open your dashboard to see real-time usage, cost breakdowns, cache performance, and anomaly alerts. Debug agent workflows step by step.
// Dashboard gives you:
// - Real-time cost and latency graphs
// - Per-endpoint request history
// - Agent debugger with tool call replayPoint your base URL
Swap one line in your existing OpenAI/Anthropic code. Your API keys stay yours. WatchLLM never marks up provider costs.
const client = new OpenAI({
baseURL: "https://proxy.watchllm.dev/v1",
apiKey: process.env.OPENAI_API_KEY, // Your key
defaultHeaders: {
"X-WatchLLM-Key": process.env.WATCHLLM_API_KEY
}
});Every call is traced
WatchLLM logs latency, tokens, cost, and cache status for every request. Semantically similar prompts are matched via vector embeddings with >95% accuracy and served from cache in under 50ms.
// For every request WatchLLM automatically:
// 1. Traces latency, tokens, and cost
// 2. Vectorizes the prompt for cache lookup
// 3. Returns a cached response or forwards to the providerObserve and control
Open your dashboard to see real-time usage, cost breakdowns, cache performance, and anomaly alerts. Debug agent workflows step by step.
// Dashboard gives you:
// - Real-time cost and latency graphs
// - Per-endpoint request history
// - Agent debugger with tool call replayWorks With Everything
Drop-in replacement for any OpenAI-compatible endpoint
Framework & SDK Integrations
Just change your base URL — no code rewrite needed
Security You Can Trust
Bank-level security for your API keys and sensitive data
SOC 2 Type II
Enterprise security controls
In ProgressAES-256-GCM
Military-grade encryption
ActiveGDPR Compliant
EU data protection
ActiveISO 27001
Information security
Planned Q2Security Features
Need a security review?
Request our security whitepaper or schedule a call with our team
Trusted by teams at
"WatchLLM gave us the observability layer we were building in-house. Saved $47k in month one just from the caching, and the agent debugger cut our debugging time from hours to minutes."
"We needed production-grade LLM tracing without rewriting our entire stack. One-line integration, full request-level visibility, and the cost attribution is something no other tool offers at this precision."
"The semantic cache alone pays for the platform. But what keeps us on WatchLLM is the reliability. 99.99% uptime, sub-50ms cache hits, and zero vendor lock-in across four providers."
Trusted by engineering teams shipping AI to production every day
Pricing
Transparent, usage-based pricing
Start free. Scale as you grow. No markup on provider API costs.
Estimate your ROI
See how much caching saves based on your current LLM spend.
Monthly savings from caching
$250
Recommended plan
Pro
Net savings after fee
$151
Break-even time
12 days
Annual savings
$1,812
Assumes an average of $0.002 per request to estimate volume. Adjust after signup.
Start building for free →Free
For side projects
- •10,000 requests/month
- •10 requests/minute
- •Basic semantic caching
- •7-day usage history
- •1 project
Exceeded your limit? No problem:
Cache-only mode after 10k requests (no additional charges)
Starter
For growing applications
- •100,000 requests/month
- •50 requests/minute
- •Advanced semantic caching
- •30-day usage history
- •Email support
Exceeded your limit? No problem:
$0.50 per 1,000 additional requests (up to 200k total)
Pro
For production workloads
- •250,000 requests/month
- •Unlimited requests/minute
- •Priority semantic caching
- •90-day usage history
- •Priority support
Exceeded your limit? No problem:
$0.40 per 1,000 additional requests (up to 750k total)
Agency
For high volume
- •10M+ requests/month
- •Custom rate limits
- •Dedicated infrastructure
- •Custom retention
- •SLA
Exceeded your limit? No problem:
Custom overage rates negotiated
FAQ
Frequently asked questions
Everything you need to know about WatchLLM.