# Klima Footprint Aggregate

> Klima Footprint Aggregate is a paid API for AI agents from klima.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-28).

Aggregates multiple disclosed carbon footprint activity components into a single total, preserving nulls and surfacing unavailable fields by name.

## Facts

- Endpoint: POST https://klima.halowerk.com/v1/footprint-aggregate?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/klima-footprint-aggregate-48800f49
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bUdZnuHfCYYFQq4PicyoG

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 klima-footprint-aggregate-48800f49 -d '<json body>'
```

Example prompt: Aggregate these three emission activities into a single footprint total — activity 'flight-001' at 420 kgCO2e from 'ICAO 2023' covering '2024-Q1', activity 'elec-002' at null from 'IEA' covering '2024-Q1', and activity 'heat-003' at 85 kgCO2e from 'DEFRA 2023' covering '2024-Q1' — and tell me which fields are missing.

## When to prefer this

Use this endpoint when you have already computed or retrieved individual activity-level kgCO2e values and need to consolidate them into a single disclosed total with transparent handling of missing data. It is the right choice when auditability matters — each component retains its source, derivation method, and time window. Prefer it over manual summation when null values need to be tracked separately and surfaced as unavailable_fields rather than silently dropped or zeroed.

## Known failure modes

- Empty activities array (minItems:1 violation) returns validation error
- Activity missing required fields (id, kgco2e, source_title, period) returns schema validation error
- More than 10,000 activities submitted exceeds maxItems limit
- Malformed numeric kgco2e value (negative or non-numeric) fails minimum:0 constraint
- Network or payment failure returns 402 or 5xx error

## How this service works

Aggregates disclosed footprint components while keeping missing values separate. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. This is neither legal advice nor customs advice.

## Output

Returns an aggregated total kgCO2e footprint across all submitted activities, with null values kept separate, a list of unavailable_fields by name, derivation method disclosures for derived values, and source/time-window/age metadata for source-backed values.

## 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"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "const": "POST"
    },
    "bodyType": {
     "const": "json"
    },
    "schemaUrl": {
     "type": "string",
     "format": "uri"
    },
    "exampleUrl": {
     "type": "string",
     "format": "uri"
    }
   },
   "additionalProperties": true
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "const": "json"
    },
    "schemaUrl": {
     "type": "string",
     "format": "uri"
    },
    "exampleUrl": {
     "type": "string",
     "format": "uri"
    }
   },
   "additionalProperties": true
  }
 },
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/klima-footprint-aggregate-48800f49/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from klima.halowerk.com](https://www.zero.xyz/host/klima.halowerk.com/llms.txt)