Carbon Fyi MCP Server

by carbon Your server? Claim it

answering

Carbon Fyi is answering right now. Last checked 2 min ago. It exposes 6 tools.

Voluntary carbon market news and open carbon price data. Read-only, keyless.

The linked repository no longer exists on GitHub — it was deleted or made private.

Uptime history 5 days of history

5 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

529 ms

Response time

average over 24h

open, no key

Access

streamable-http

This one has been quiet for a while

Quiet is not dead — but it is worth knowing when it wakes up, or when someone else takes it over. We watch the repository and tell you either way.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add carbon-fyi --transport http https://www.carbon.fyi/api/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "carbon-fyi": {
      "url": "https://www.carbon.fyi/api/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.carbon-fyi]
url = "https://www.carbon.fyi/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "carbon-fyi": {
      "url": "https://www.carbon.fyi/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "carbon-fyi": {
      "url": "https://www.carbon.fyi/api/mcp"
    }
  }
}

Available tools 6

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

carbon

get_carbon_prices

Current voluntary carbon credit prices from two independent sources: per-category minimum/median price and available supply across the Carbonmark marketplace catalog, and spot prices per Klima Protocol carbon class. The two are NOT comparable — read the `caveats` field on each before using either number.

market

get_market_summary

One call for orientation: how much of the archive is available, when it last updated, the story-tag breakdown (use these as `tag` values for search_news), and the current price table. Start here.

news

search_news

Search carbon.fyi's curated voluntary carbon market story archive. Each story is an editorially clustered summary of one development, written from one or more original reports, and always carries the original source name and URL. Supply at least one filter; results are newest-first. Use `get_market_summary` first if you do not know what tags or date range to ask for.

price

get_price_history

Daily-averaged historical price series. This archive exists only because carbon.fyi records it three times a day: no upstream API serves a historical carbon price series, so these observations cannot be obtained anywhere else and cannot be re-derived. Check `seriesStartsAt` in the response — the archive began on 2026-08-27, so early windows are necessarily short.

sources

list_sources

The publications, registries and integrity bodies carbon.fyi monitors. Useful for judging coverage — a topic absent from the archive may simply not be covered by these sources.

story

get_story

Fetch a single story by its id, including every source that reported it. Story ids are permanent — a published story keeps its id and its public URL indefinitely — so they are safe to store.

Endpoints

URL	Transport	State	Latency	Checked
https://www.carbon.fyi/api/mcp	streamable-http	answering	478 ms	2 min ago

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Carbon Fyi — questions

Answers built from our own checks of this server.

What can Carbon Fyi do?

It exposes 6 tools, read directly from the server on our last check. Among them: get_carbon_prices, get_market_summary, get_price_history, get_story, list_sources, search_news. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Carbon Fyi working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 529 ms. The bar chart above shows every period we have measured.

Is Carbon Fyi still maintained?

The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.

How do I connect Carbon Fyi?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Carbon Fyi need an API key?

No. Carbon Fyi completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Carbon Fyi?

It answers our handshake in 529 ms on average, which is faster than 31% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.