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Carbon Fyi MCP Server

by carbon Your server? Claim it
not responding

Carbon Fyi is listed as active in the registry but did not answer our last check. 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 73 days of history · worst day 0%
73 days agonow
0.0%
Uptime 24h
0 of 91 checks
6
Tools
read from the server
91 ms
Response time
average over 24h
open, no key
Access
streamable-http

Carbon Fyi does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 min ago.

run in your terminal
claude mcp add carbon-fyi --transport http https://www.carbon.fyi/api/mcp
Settings → Connectors → Add custom connector, then paste this address
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
{
  "servers": {
    "carbon-fyi": {
      "type": "http",
      "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

URLTransportStateLatencyChecked
https://www.carbon.fyi/api/mcp streamable-http answering 91 ms 14 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 0 of 91 checks got a reply (0.0%), average response time 91 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.
The registry lists Carbon Fyi as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
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 in the form 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.