MCP server

ZeroCarbon in ChatGPT, Claude and Gemini

ZeroCarbon's greenhouse-gas calculators, EU CBAM default values and BRSR Core indicators, as tools any AI assistant that speaks the Model Context Protocol can call. Every figure comes from a published emission factor, cited with its source and edition. No account is needed.

Server URL (Streamable HTTP)

https://zerocarbon.org.in/api/v1/mcp

No authentication for the tools below. MCP 2025-11-25; older protocol versions are negotiated.

Tools

calculate_electricity_emissions	Scope 2 (location-based) emissions of grid electricity from kWh and the country, using that country's published grid factor.
calculate_fuel_emissions	Scope 1 emissions from diesel, petrol, natural gas, LPG, CNG, coal or furnace oil, with unit conversion.
calculate_flight_emissions	Scope 3 economy-class flight emissions from the one-way distance, banded short, medium or long haul.
calculate_freight_emissions	Scope 3 freight emissions by road, rail, sea or air from weight and distance (tonne-km).
lookup_cbam_default_value	The EU CBAM default value for a CN code and country of origin, with the year's mark-up, and embedded emissions for a quantity.
explain_brsr_core_indicator	What SEBI's BRSR Core asks for in its greenhouse-gas footprint attribute, and the assessment or assurance timeline.
save_to_zerocarbon	Only when you ask: recalculates your calculations and keeps them under a private link for 14 days.

The six calculators and lookups are read-only. Calculators need the country: emission factors are national and none is assumed. An input with no published factor is refused with the reason and what to send instead.

With your workspace's API key

Send a ZeroCarbon API key as a Bearer token and the same server adds your company's own tools: about 30 read-only views (emission records, reports, compliance deadlines, CBAM goods, production and communications, ESG metrics, SBTi targets, forecasts, anomalies, suppliers and their submissions, documents, products) and around 30 actions (add a manual entry, invite or update a supplier, record CBAM goods and production, save ESG figures, set a target, review extracted rows). Each action goes through the same page route as in the app, with its checks: an API key acts at member level, so owner and admin changes are refused and named for you to do in the app.

Add it to your assistant

Claude

Settings > Connectors > Add custom connector, then paste the server URL. Works on claude.ai, the desktop app and mobile.

ChatGPT

In Settings > Apps & Connectors > Advanced settings, turn on developer mode, then create a connector with the server URL.

Gemini CLI

Add the server to ~/.gemini/settings.json:

{
  "mcpServers": {
    "zerocarbon": { "httpUrl": "https://zerocarbon.org.in/api/v1/mcp" }
  }
}

VS Code

Add the server to .vscode/mcp.json:

{
  "servers": {
    "zerocarbon": { "type": "http", "url": "https://zerocarbon.org.in/api/v1/mcp" }
  }
}

Cursor

Add the server to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "zerocarbon": { "url": "https://zerocarbon.org.in/api/v1/mcp" }
  }
}

Try it

“What are the emissions from 12,000 kWh of grid electricity in India?”
“We burned 800 litres of diesel in generators in the UK last quarter. What is that in CO2e?”
“CBAM default value for CN 72083900 made in India, for 2026 imports?”
“Save these calculations.”

Data and privacy

The calculators receive only the values the assistant sends, such as kWh and a country. Nothing is stored from a calculation.
When you ask to save, the inputs and results are kept under a private link for 14 days, then deleted. Anyone holding the link can view them.
Requests are rate-limited per session and network address to keep the service available.
The full notice is in our privacy policy; terms are in the terms of service.

Limits

Flights use economy-class factors; route distances are not estimated.
BRSR Core coverage is the greenhouse-gas footprint attribute only.
CBAM default values come from the Commission's corrected workbook (Implementing Regulation (EU) 2026/1740); no certificate price is applied.

Support

Email support@zerocarbon.org.in. Developers can also call the same calculators over plain HTTPS; see the API tutorial.