# Agri Halowerk Carbon Stock Calculator

> Agri Halowerk Carbon Stock Calculator is a paid API for AI agents from agri.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Converts soil area, sampling depth, bulk density, and initial/final organic carbon percentages into soil carbon stock estimates and a gross CO2-equivalent difference using the stock-difference method.

## Facts

- Endpoint: POST https://agri.halowerk.com/v1/carbon-capture
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agri-halowerk-carbon-stock-calculator-d51348ce
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eZGp37YX7jENY1yHLHE4e

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 agri-halowerk-carbon-stock-calculator-d51348ce -d '<json body>'
```

Example prompt: Calculate the soil carbon stock and gross CO2-equivalent difference for a 500-hectare field sampled to 30 cm depth, with a bulk density of 1200 kg/m3, where the initial organic carbon was 2.1% and the final is now 2.8%.

## When to prefer this

Use this endpoint when you need a fast, deterministic computation of soil organic carbon stocks and gross CO2-equivalent differences from direct soil measurements. Ideal for pre-screening agricultural fields, research calculations, or generating indicative numbers before formal verification. Prefer this over manual calculations or spreadsheet tools when integrating into an automated pipeline. Do not use if you need verified carbon credits, additionality analysis, or permanence assessment — this endpoint explicitly disclaims those capabilities.

## Known failure modes

- Missing required fields (area_hectares, bulk_density_kg_per_m3, etc.) result in validation errors
- Values outside allowed ranges (e.g. area > 100,000,000 ha or bulk density < 1 kg/m3) are rejected
- Negative carbon differences are returned if final OC% is lower than initial — not an error, just a carbon loss scenario
- No network connectivity or service downtime returns HTTP error codes

## How this service works

Converts area, sampling depth, bulk density and initial/final organic-carbon mass fractions into stock estimates and a gross CO2-equivalent difference. This is a simple stock-difference calculation; it does not establish additionality, permanence, leakage, sampling representativeness, credit eligibility or verified carbon removal.

## Output

Returns soil carbon stock values (likely in tonnes of carbon per hectare and total), plus a gross CO2-equivalent difference computed from the initial and final organic carbon fractions applied across the specified area and depth. Does not include additionality, permanence, leakage, or credit eligibility assessments.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "area_hectares": {
   "type": "number",
   "maximum": 100000000,
   "minimum": 0.0001
  },
  "sampling_depth_cm": {
   "type": "number",
   "maximum": 1000,
   "minimum": 0.1
  },
  "bulk_density_kg_per_m3": {
   "type": "number",
   "maximum": 5000,
   "minimum": 1
  },
  "final_organic_carbon_percent": {
   "type": "number",
   "maximum": 100,
   "minimum": 0
  },
  "initial_organic_carbon_percent": {
   "type": "number",
   "maximum": 100,
   "minimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agri-halowerk-carbon-stock-calculator-d51348ce/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agri.halowerk.com](https://www.zero.xyz/host/agri.halowerk.com/llms.txt)