MongoDB - Build AI That Scales
Mini tools
Cut LLM API costs without breaking responses.
SemanticGuard
Overview
SemanticGuard is an AI gateway designed to reduce costs related to OpenAI, Anthropic, and Google AI use. It achieves this through the application of intelligent caching with multi-layer verification.
This ensures that the information used is up-to-date and accurate. SemanticGuard offers a simple integration for users with just one line of code required.
The tool provides a system wherein all calls to the AI tool are automatically cached and tracked. Users can view real-time savings and are given the ability to measure their potential savings through the use of 'Shadow Mode'.
Once users are satisfied with their potential saving, they can enable caching.The tool specializes in robust caching capabilities, guaranteeing cache hits within under 50ms and offers a fail-open design for if the cache is down, allowing requests to go straight to the provider avoiding downtime.
In order to maintain the accuracy, SemanticGuard stores only selected API keys at request time and never stores upstream API keys. They offer a full security posture, with encryption in transit and at rest.
SemanticGuard is built for Vercel but plans to make it possible for users to host it themselves in short order. The tool is designed for production environments, providing continuous learning and multiple layers of verification for each cache hit.
It has the unique ability to catch varying elements in prompts such as names, dates, IDs, and more.
Supported features
Key Features
- Self-validating Cache With Multi-layer Verification On Every Hit
- Real-time Cost And Savings Analytics Dashboard
- One-line Sdk Integration Via Withsemanticguard()
- 100% Measured Cache Correctness On Public Benchmark
- Shadow Mode For Measuring Potential Savings Before Enabling Caching
- Fail-open Design With Zero Downtime Risk
- Cross-provider Caching Across Openai, Anthropic, Google, Azure, Bedrock, Mistral
- Cache Hits Return In Under 50 Milliseconds
- Configurable Similarity Thresholds And Ttl
- Pii Redaction On Stored Prompts (api Keys, Tokens, Emails) On By Default
Releases
Pricing
Top alternatives
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AI API proxy — you save first, then we earn. One URLHans Berge🙏 1 karmaMar 11, 2026@Lexi"Finally — an AI cost tool that actually aligns incentives" I've been working in enterprise IT and AI infrastructure for years, and Lexi is one of the most elegantly designed products I've seen in this space. The core insight is simple but powerful: don't charge unless you save money. That alignment alone sets it apart from every other API middleware I've tested. The integration literally took under two minutes — one URL change in our config, and we were live across multiple providers. The cost transparency in the response headers is genuinely useful for us as a team building on top of AI; we can now log, display, and report on exact token costs per request. The O(1) memory compression is the real technical differentiator. Long AI conversations tend to degrade in quality and balloon in cost — Lexi solves both problems simultaneously. For anyone running AI in production at any scale, this is infrastructure you didn't know you were missing. Highly recommended for developers, startups, and enterprise teams alike.
