AI省钱核弹：Token砍99%，API也能白嫖 | Cut 99% Tokens, Get Free AI APIs

 

一个给AI Agent装大脑，一个给穷学生装印钞机：前者真省钱，后者真免费但有坑。/One gives your AI agent a brain; the other gives broke developers free APIs. The first saves tokens; the second is free—with strings attached.

1. Codebase-Memory-MCP：别让Agent天天翻文件/Stop Your Agent From Reading Files All Day

传统Agent经常 grep -> read file -> grep -> read，像实习生翻档案翻到凌晨；Codebase-Memory-MCP 用纯C写的MCP Server，把整个仓库索引成持久化SQLite知识图谱。/Traditional agents loop through grep -> read file -> grep -> read; Codebase-Memory-MCP builds a persistent SQLite knowledge graph instead.

  • 155种语言、tree-sitter + LSP；Linux内核2800万行、7.5万文件约3分钟索引。/It supports 155 languages with tree-sitter and LSP; the Linux kernel benchmark is about 28M LOC and 75K files in roughly three minutes.

  • 14个MCP工具，Cypher查询 <1ms，支持调用链、死代码、架构及HTTP/gRPC关系。/It provides 14 MCP tools, sub-1ms Cypher queries, call chains, dead-code detection, architecture and HTTP/gRPC links.

  • .codebase-memory/graph.db.zst 可提交Git共享；localhost:9749 可看3D图谱。/The compressed graph can be committed to Git and viewed as a 3D graph at localhost:9749.

  • 实测5个结构化查询：3,400 tokens vs 412,000 tokens，减少99.2%，约120倍。/Five structured queries reportedly used 3,400 tokens vs 412,000 tokens, a 99.2% reduction, or about 120× fewer tokens.

  • 31个真实仓库评测83%准确率；MIT开源、完全免费、本地处理、无需API Key。/It was evaluated on 31 real repositories at 83% answer quality; MIT licensed, free, local, and requires no API key.

安装：/Install:

curl -fsSL https://raw.githubusercontent.com/DeusData/codebase-memory-mcp/main/install.sh | bash

安装后重启Agent，然后说：/Restart your agent and say:

Index this project

支持Mac/Linux/Windows，包括macOS arm64/amd64、Linux amd64/arm64、Windows amd64；支持Claude Code、Codex CLI、Cursor、Zed、OpenCode、VS Code等。/It supports macOS arm64/amd64, Linux amd64/arm64 and Windows amd64, with Claude Code, Codex CLI, Cursor, Zed, OpenCode, VS Code and more.

无需邮箱、银行卡、手机、API Key；有电脑和MCP客户端即可。/No email, bank card, phone or API key is required; you only need a computer and an MCP client.

2. FreeTheAi：Discord一条命令拿免费API/Free APIs Through Discord

FreeTheAi是免费OpenAI兼容API网关，一个Key接60+活跃模型。/FreeTheAi is a free OpenAI-compatible API gateway with 60+ active models behind one key.

支持 /v1/chat/completions、/v1/messages、/v1/responses、/v1/images/generations、/v1/audio/speech，支持流式、工具调用和多种模型。/It supports chat, Anthropic-style Messages, Responses, image generation, speech, streaming and tool calling.

免费，但限制也很实在：Discord /signup 获取Key，每天 /checkin 激活；Tier1为10 RPM、1并发、每天250次成功请求，邀请可解锁35 RPM。/It is free but limited: use Discord /signup for a key and /checkin daily; Tier1 provides 10 RPM, one concurrent request and 250 successful requests per day, with invites unlocking up to 35 RPM.

可选付费slot：/Optional paid slots:

https://freetheai.xyz/pricing

快速调用：/Quick test:

curl https://api.freetheai.xyz/v1/chat/completions \

  -H "Authorization: Bearer $FREETHEAI_API_KEY" \

  -H "Content-Type: application/json" \

  -d '{

    "model": "glm/glm-5.1",

    "messages": [

      { "role": "user", "content": "Write a Python hello world." }

    ],

    "stream": true

  }'

Discord命令：/signup /checkin /resetkey /models /stats。/Discord commands include /signup, /checkin, /resetkey, /models, and /stats.

需要Discord账号+邮箱；不需要银行卡、身份证、手机，但会记录IP、Key前缀及安全元数据，且每日需要做人机验证。/You need a Discord account and email; no bank card, ID or phone, but IP, key prefix and security metadata are recorded, and daily human verification is required.

3. 热点方向：省钱不等于乱薅/Hot Take: Free Doesn’t Mean Unlimited

TOP 1：Codebase-Memory-MCP，核心是知识图谱替代逐文件grep，主打99% Token减少。/TOP 1: Codebase-Memory-MCP, replacing file-by-file grep with a knowledge graph for massive token savings.

TOP 2：5大正规免费API，包含Google AI Studio、Groq、OpenRouter、HuggingFace、AssemblyAI。/TOP 2: five mainstream free API platforms including Google AI Studio, Groq, OpenRouter, HuggingFace and AssemblyAI.

TOP 3：免费AI API Key实操，重点是申请Key、Endpoint配置以及连接Coding工具和CLI。/TOP 3: free AI API key setup covering keys, endpoints, coding tools and CLI integration.

原Discord方案的优势是模型多、零成本；缺点是签到、限速和账号/服务风险。/The Discord route offers many models at zero cost, but adds daily check-ins, rate limits and account/service risks.

4. 最终组合：Agent省Token，API走正规免费层/The Practical Combo

想让Agent少烧Token，就装Codebase-Memory-MCP；想零成本调模型，优先申请Google AI Studio和Groq等官方免费层，FreeTheAi作为补充备选。/For fewer agent tokens, use Codebase-Memory-MCP; for zero-cost API experiments, prefer official free tiers such as Google AI Studio and Groq, with FreeTheAi as an optional backup.

省钱之道，贵在不乱烧；知其限，方能久用。/Spend less by avoiding waste; know the limits, and free tools last longer.

相关链接 (Related Links):

https://deusdata.github.io/codebase-memory-mcp/

https://github.com/DeusData/codebase-memory-mcp

https://freetheai.xyz

https://freetheai.xyz/docs

https://freetheai.xyz/setup

https://github.com/vibheksoni/free-ai

https://github.com/Free-The-Ai/free-ai

https://discord.gg/secrets

https://ai.google.dev/

https://console.groq.com/

https://openrouter.ai/

https://huggingface.co/

https://chromewebstore.google.com/detail/page-assist-a-web-ui-for/jfgfiigpkhlkbnfnbobbkinehhfdhndo

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