Show HN: PrismCat – Local transparent proxy and debugging console for LLM APIs
PrismCat is a self-hosted transparent proxy and debugging console designed for LLM APIs. It allows users to monitor and capture requests and responses between their applications and various LLM services. With features like full traffic observability and request replay, PrismCat aims to simplify debugging and enhance transparency in API interactions.
- ▪PrismCat enables users to see every request and response between their app and LLM APIs by changing a single line in the code.
- ▪It supports various LLM APIs, including OpenAI, Claude, and Gemini, and provides a user-friendly interface for monitoring traffic.
- ▪The tool is designed to run continuously, automatically capturing data without requiring manual intervention.
Hacker News (AI / LLM) files mainly under ai. We currently carry 2,501 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
inspect →
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | GitHub |
| Canonical URL | https://github.com/paopaoandlingyia/PrismCat |
| Publication time | Tue, 26 May 2026 13:11:26 +0000 |
| Retrieval time | 2026-05-26T13:12:49.435Z |
| Last seen | 2026-05-26T13:12:49.435Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | WKAt-h5lFLz1 |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
🐱 PrismCat English | 简体中文 You never know how much junk your SDK silently injects into your prompts — until you use PrismCat. PrismCat is a self-hosted, transparent proxy and debugging console for LLM APIs. Change one line — your base_url — and instantly see every request and response between your app and OpenAI / Claude / Gemini / Ollama / any LLM API, including streaming (SSE). ⚡ Get Started in 30 Seconds 1. Launch Grab the binary for your system from Releases. Platform How to Start Windows Run prismcat.exe — it lives in your system tray Linux / macOS Run ./prismcat Docker See Docker Deployment Open http://localhost:8080 in your browser. 2. Add an Upstream In the Settings page, add an upstream.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at GitHub.
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