contextslim

High-performance M2M context middleware and x402 micropayment engine for AI Agents and MCP tools on Base.

CommunityDegradedNo sign-inGlobalFreeRead-only

What it can do

  • Optimize Context: Prunes massive JSON context payloads by up to 85% (622 -> 94 tokens) while enforcing strict token budgets and caching references in Cloudflare KV for multi-turn retrieval.
  • Fetch Result: Retrieves exact field subsets via JSONPath dot-notation from cached context references with up to 98.5% token savings (622 -> 9 tokens) and sub-second latency.

What data it sees

Do you need an account

No: the server works without sign-in

High-performance M2M context middleware and x402 micropayment engine for AI Agents and MCP tools on Base.

ContextSlim prunes massive JSON payloads by up to 85%, enforces strict token budgets, and handles autonomous HTTP 402 EIP-712 micropayments—keeping agent execution fast, cost-effective, and deterministically within LLM context limits.

How to connect

How to connect contextslim to Claude

The server address to paste into Claude settings:

https://contextslim--friczero-com.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect contextslim to ChatGPT

The server address to paste into ChatGPT settings:

https://contextslim--friczero-com.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect contextslim to Cursor

The server address to paste into Cursor settings:

https://contextslim--friczero-com.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (2)

Raw names from tools/list. Only developers need these.

optimize_contextPrunes massive JSON context payloads by up to 85% (622 -> 94 tokens) while enforcing strict token budgets and caching references in Cloudflare KV for multi-turn retrieval.
fetch_resultRetrieves exact field subsets via JSONPath dot-notation from cached context references with up to 98.5% token savings (622 -> 9 tokens) and sub-second latency.