# fyi.carbon/carbon-fyi (remote · www.carbon.fyi)

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

- Trust score: 81/100 (high trust)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-23

## Components

- remote · `www.carbon.fyi`: 81/100 (this document), [markdown](https://verifymcp.io/servers/fyi-carbon-carbon-fyi/api-mcp.md), [page](https://verifymcp.io/servers/fyi-carbon-carbon-fyi/api-mcp)

## Channel facts

- Endpoint: `https://www.carbon.fyi/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-23.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 6 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 82/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 630 tokens (~105/item across 6 items; 6 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 90/100
  - Stability observed for 27 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the fyi.carbon/carbon-fyi MCP server?

fyi.carbon/carbon-fyi is a hosted endpoint at https://www.carbon.fyi/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

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

### Cursor

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

### VS Code

```json
{
  "servers": {
    "fyi-carbon-carbon-fyi": {
      "type": "http",
      "url": "https://www.carbon.fyi/api/mcp"
    }
  }
}
```

### Codex

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

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "fyi-carbon-carbon-fyi": {
      "type": "remote",
      "url": "https://www.carbon.fyi/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add fyi-carbon-carbon-fyi --url 'https://www.carbon.fyi/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  fyi-carbon-carbon-fyi:
    url: "https://www.carbon.fyi/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "fyi-carbon-carbon-fyi": {
      "Transport": "http",
      "Url": "https://www.carbon.fyi/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add fyi-carbon-carbon-fyi -t streamable-http -u 'https://www.carbon.fyi/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "fyi-carbon-carbon-fyi": {
      "type": "http",
      "url": "https://www.carbon.fyi/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-23 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-21 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-19 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-17 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 60 to 63. That category is still filling its 30-day observation window: 18 days of observed history at the previous scan, 19 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-13 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-10 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-08 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (6)

### `search_news` (~158 tokens)

Search VCM 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.

Input parameters:

- `limit` (integer): max stories to return (default 20, ceiling 50)
- `query` (string): case-insensitive text match against headline and summary, e.g. 'Verra' or 'biochar'
- `since` (string): only stories first published on or after this UTC day
- `tag` (string): restrict to one story category

### `get_story` (~65 tokens)

Get one 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.

Input parameters:

- `id` (string, required): the story's `id`, as returned by search_news

### `get_carbon_prices` (~66 tokens)

Current 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.

### `get_price_history` (~152 tokens)

Carbon 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.

Input parameters:

- `days` (integer): look-back window in days (default 90)
- `key` (string): restrict to one category or class name (exact match, as returned by get_carbon_prices); omit for all
- `kind` (string, required): which price source: marketplace category medians, or Klima carbon-class spot prices

### `get_market_summary` (~52 tokens)

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.

### `list_sources` (~41 tokens)

Monitored 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.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/fyi-carbon-carbon-fyi/api-mcp#diagnostics

## Score history

- 2026-09-23: 81
- 2026-09-22: 80
- 2026-09-21: 80
- 2026-09-20: 79
- 2026-09-19: 79
- 2026-09-18: 78
- 2026-09-17: 78
- 2026-09-16: 77
- 2026-09-15: 77
- 2026-09-14: 76
- 2026-09-13: 76
- 2026-09-12: 75
- 2026-09-11: 75
- 2026-09-10: 75
- 2026-09-09: 74
- 2026-09-08: 74
- 2026-09-07: 73
- 2026-09-06: 73
- 2026-09-05: 72
- 2026-09-04: 72
- 2026-09-03: 71
- 2026-09-02: 71
- 2026-09-01: 70
- 2026-08-31: 70
- 2026-08-30: 69
- 2026-08-29: 69
- 2026-08-28: 68
- 2026-08-27: 68

## Common questions

### What is the fyi.carbon/carbon-fyi MCP server?

fyi.carbon/carbon-fyi is an MCP server listed in the public MCP registry as fyi.carbon/carbon-fyi. Voluntary carbon market news and open carbon price data. Read-only, keyless. This page covers its hosted endpoint (https://www.carbon.fyi/api/mcp).

### Is the fyi.carbon/carbon-fyi MCP server safe to use?

fyi.carbon/carbon-fyi scores 81 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the fyi.carbon/carbon-fyi MCP server expose?

fyi.carbon/carbon-fyi exposes 6 tools: search_news, get_story, get_carbon_prices, get_price_history, get_market_summary, list_sources. Their descriptions and schemas cost roughly 534 tokens of context every time the server is loaded.

### Does the fyi.carbon/carbon-fyi MCP server require authentication?

No. We connected to fyi.carbon/carbon-fyi without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the fyi.carbon/carbon-fyi MCP server still maintained?

fyi.carbon/carbon-fyi is still listed as active in the MCP registry. We last reached this channel on 23 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://www.carbon.fyi/api/mcp
- Repository: https://github.com/Carbonmark/carbon.fyi-new
- Website: https://www.carbon.fyi/mcp
- Changelog RSS feed: https://verifymcp.io/servers/fyi-carbon-carbon-fyi/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/fyi-carbon-carbon-fyi/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/fyi-carbon-carbon-fyi/api-mcp