# Vercel — Fluid: How we built serverless servers

- Company: Vercel (vercel.com)
- Announced: 2025-07-28T13:00:00+00:00
- Category: not stated
- Coverage: not counted
- Announcement: no
- Group: routine
- Source: https://vercel.com/blog/fluid-how-we-built-serverless-servers
- Record: https://forck.live/items/20850-fluid-how-we-built-serverless-servers
- Subject: v0 / AI SDK / AI Gateway

Vercel described the infrastructure behind Fluid compute, which powers over 45 billion weekly requests and saves customers up to 95% by never charging CPU rates for idle time. The system uses a secure TCP-based tunnel to stream responses from AWS Lambda, and a compute-resolver service to route requests efficiently. Active CPU pricing was introduced at Vercel Ship 2025 for more cost-effective compute.

## Evidence

Verbatim from https://vercel.com/blog/fluid-how-we-built-serverless-servers:

> Fluid compute with Active CPU pricing powers over 45 billion weekly requests, saving customers up to 95% and never charging CPU rates for idle time.

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