Wardstone
Wardstone Guard is an LLM firewall that detects prompt injections, jailbreaks, harmful content, and PII leakage in a single API call with Sub-30ms latency. Free tier available.
Wardstone launched on February 14, 2026 with 2 votes, #6,501 of 16,628 launches that month.
What it does
Wardstone is an LLM security API that detects prompt injections, jailbreaks, harmful content, and data leakage in a single call with sub-30ms latency. It works as a firewall between your app and any LLM provider, scanning both inputs and outputs. Drop-in REST API with SDKs for TypeScript, Python, Go, Ruby, PHP, Java, and C#. Four detection categories with risk bands out of the box. Free tier with 10,000 calls/month, no credit card needed. Start protecting your AI in minutes.
Wardstone Guard: LLM security API and AI guardrails for prompt injection detection, jailbreak prevention, AI content moderation, and PII leakage protection. An LLM firewall that works with any model. Block attacks and harmful content on input. Catch unsafe responses on output. One API, Sub-30ms , any model. Identify prompt attacks, harmful content, data leakage, and unknown links in a single inference call. Get production-ready risk bands by default. Paid plans can optionally include raw model scores for calibration. Scans prompts for jailbreaks, injections, and malicious intent before processing. Filters responses for PII and toxic content before delivery. Works seamlessly with any LLM…from wardstone.ai
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