The API MCP server,
connected in one click.
Sourced carbon emission factors + audit-traced calculations an AI can cite. Connect the official API MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add API to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http api-2 https://mcp.greencalculus.comRun in your terminal, then restart Claude Code.
API · https://mcp.greencalculus.com
What your AI can do with API
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “lookup_factor”: Look up a single greenhouse-gas emission factor by its canonical key. Returns the value plus an audit envelope: provenance (publisher, exact.”
“Use “search_factors”: Find emission factors by section, key prefix, or free text. Returns each match with its key, name, section, VALUE, unit and gas — enough to.”
“Use “lookup_factors”: Look up SEVERAL emission factors by key in one call, each with the same audit envelope lookup_factor returns — provenance (publisher, exact.”
“Use “calculate_activity”: Turn activity data into greenhouse-gas emissions: emissions = activity × factor. Give an amount + unit and a factor key; the unit engine con.”
How secure is the API MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how API holds up.
Official endpoint
Operated by API (greencalculus.com) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If API adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick API
Choose API in the gate directory. No sign-in needed.
Use it anywhere
API's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools API exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
lookup_factor — Look up a single greenhouse-gas emission factor by its canonical key. Returns the value plus an audit envelope: provenance (publisher, exact
search_factors — Find emission factors by section, key prefix, or free text. Returns each match with its key, name, section, VALUE, unit and gas — enough to
lookup_factors — Look up SEVERAL emission factors by key in one call, each with the same audit envelope lookup_factor returns — provenance (publisher, exact
calculate_activity — Turn activity data into greenhouse-gas emissions: emissions = activity × factor. Give an amount + unit and a factor key; the unit engine con
calculate_embodied — Whole-life embodied carbon for materials, per EN 15978. Give a material key + quantity (+ optional boundary A1-A3 / A1-A4 / A1-A5 / A1-C); i
calculate_pcaf — Compute PCAF Part A financed emissions for a portfolio. Returns each holding's attribution factor and financed emissions, the portfolio tota
calculate_electricity — GHG Protocol Scope 2 for purchased electricity, both methods. Always returns location-based (grid-average) emissions; also returns market-ba
calculate_freight — Freight & logistics emissions (Scope 3 Cat 4 & 9), GLEC tonne-km method: emissions = tonnes × km × factor. Find mode factors via search_fact
+ 4 more tools once connected
Who runs the API MCP server?
The API MCP server at a glance
https://mcp.greencalculus.comQuestions, answered
Is there an official API MCP server?
Yes — API operates its own remote MCP server at mcp.greencalculus.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect API to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick API in the directory. No account or sign-in is needed. From then on, API's tools are available in every client you've connected to gate.
Do I need to host anything?
No. API runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the API MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect API in minutes. No credit card required.
Connect more than just API
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up API in: Claude · Claude Code · ChatGPT · Cursor · VS Code