# RegRails CBAM Embedded Emissions & Certificate Cost Estimator

> RegRails CBAM Embedded Emissions & Certificate Cost Estimator is a paid API for AI agents from reg.chainverdict.xyz, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).

Computes line-by-line embedded emissions and indicative CBAM certificate costs for imported goods, echoing every arithmetic step, using caller-supplied emission factors and certificate prices.

## Facts

- Endpoint: POST https://reg.chainverdict.xyz/v1/cbam/estimate
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/regrails-cbam-embedded-emissions-certificate-cost-estimator-4f42f9fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XrsNWY7Ylj5wyeJRxXa2u

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 regrails-cbam-embedded-emissions-certificate-cost-estimator-4f42f9fb -d '<json body>'
```

Example prompt: Calculate the embedded emissions and indicative CBAM certificate cost for my three import lines — 500 tonnes of hot-rolled steel at 1.85 tCO2/t, 200 tonnes of aluminium at 6.7 tCO2/t, and 100 tonnes of cement at 0.83 tCO2/t — using a certificate price of €50 per tonne CO2, and show me every arithmetic step.

## When to prefer this

Choose this endpoint when you need a fully transparent, auditable, step-by-step embedded emissions and certificate cost calculation using your own emission factors — not a black-box estimate. It is specifically designed for CBAM declarants who must supply verified intensities and want every arithmetic step visible for internal audit or compliance review. Prefer it over generic carbon calculators when CBAM-specific line-by-line decomposition and arithmetic traceability are required.

## Known failure modes

- Missing required emission intensities or certificate price — endpoint deliberately provides no defaults, so omitting these fields causes a validation error
- Malformed import line data (missing quantity, CN code, or intensity) returns a structural error
- Supplying stale or incorrect emission factors produces arithmetically correct but substantively wrong results — the service echoes what it receives
- Non-CBAM CN codes may produce warnings or require explicit sector mapping
- Rate limit or payment failure (x402 protocol) results in 402 Payment Required response

## How this service works

Embedded emissions and indicative certificate cost, computed line by line with every arithmetic step echoed back. RegRails supplies no default emission factors on purpose — a stale factor produces a wrong liability — so intensities and certificate price are yours. Indicative only, never a basis for a declaration.

## Output

A structured response containing per-line embedded emissions (tonnes CO2), total embedded emissions across all lines, indicative certificate cost in the currency of the supplied price, and a full step-by-step arithmetic trace for each calculation — explicitly marked as indicative and not suitable as a formal declaration basis.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/regrails-cbam-embedded-emissions-certificate-cost-estimator-4f42f9fb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from reg.chainverdict.xyz](https://www.zero.xyz/host/reg.chainverdict.xyz/llms.txt)