# Viridis Embodied Carbon Quantity Takeoff

> Viridis Embodied Carbon Quantity Takeoff is a paid API for AI agents from mcp.viridisconservation.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-15).

Calculates auditable material quantities from a bill of materials or construction geometry for embodied carbon accounting and GHG inventory input.

## Facts

- Endpoint: POST https://mcp.viridisconservation.com/x402/quantity-takeoff/calculate_takeoff
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/viridis-embodied-carbon-quantity-takeoff-3f8ad2bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dm7ifvtIf3DOg-3kTuATN

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability viridis-embodied-carbon-quantity-takeoff-3f8ad2bd -d '<json body>'
```

Example prompt: Run a quantity takeoff for my construction project — I have a concrete slab assembly with dimensions 10m x 20m x 0.3m using the SI unit system, and I need auditable material quantities for carbon accounting.

## When to prefer this

Use this endpoint when you need auditable, deterministic material quantity calculations from construction geometry or bill-of-materials data specifically for embodied carbon accounting, GHG Scope 3 reporting, or sustainability disclosures (CSRD/IFRS S2). It pairs naturally with the Viridis GHG inventory and disclosure compilers. Prefer this over manual spreadsheet takeoffs or generic quantity calculators when auditability and carbon-specific output formats are required.

## Known failure modes

- Missing required 'items' array in queryParams returns validation error
- Invalid or unrecognized assembly type returns an error or null quantity
- Dimensions object missing required keys for the specified assembly type causes a computation failure
- Invalid unit_system value (not 'imperial' or 'SI') returns a schema validation error
- Empty items array (minItems:1 violated) returns a 400-level error
- Payment not processed (x402 protocol failure) results in 402 response

## How this service works

Embodied carbon quantity takeoff from a bill of materials or explicit construction geometry, producing auditable material quantities for carbon accounting. The measure step pairs with the Viridis GHG inventory and sustainability disclosure engines.

## Output

A JSON object containing auditable material quantities for each submitted assembly item, with breakdowns suitable for feeding into a GHG inventory or sustainability disclosure engine. Each result maps to the input item ID with computed quantity values in the requested unit system.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/viridis-embodied-carbon-quantity-takeoff-3f8ad2bd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp.viridisconservation.com](https://www.zero.xyz/host/mcp.viridisconservation.com/llms.txt)