# Home Energy Calculators – Monthly Electricity Bill Estimator

> Home Energy Calculators – Monthly Electricity Bill Estimator is a paid API for AI agents from home-energy-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Estimates a monthly electricity bill from kWh usage using block-tier rates, a fixed monthly service charge, and an optional tax/fee percentage.

## Facts

- Endpoint: GET https://home-energy-calc.x402tookit.com/bill-estimate?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/home-energy-calculators-monthly-electricity-bill-estimator-6b1670f9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_j01-CqvyznaNqBDUFcCG1

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 home-energy-calculators-monthly-electricity-bill-estimator-6b1670f9
```

Example prompt: I used 950 kWh this month — my utility charges $0.12 per kWh for the first 500 kWh and $0.18 for anything above that, plus a $12 fixed service charge and 8% in taxes. Can you estimate my total electricity bill with a tier breakdown?

## When to prefer this

Choose this endpoint when you need a structured, tier-aware electricity bill computation — especially when the user's utility plan uses block/stepped pricing. It handles multi-tier rate schedules, fixed service charges, and percentage taxes in a single call, returning a full breakdown. Prefer it over generic math tools when the output needs to be utility-bill-shaped (tier breakdown, average $/kWh, summary text).

## Known failure modes

- Missing required 'kwh' or 'tiers' parameters returns an error
- Invalid tier string format (e.g., missing 'rest@rate' final block) causes a parse error
- kWh value out of range (negative or above 100000) may be rejected
- taxPercent outside 0–50 range may be rejected
- Malformed rate values (non-numeric) in tier string cause failures

## How this service works

Estimate a monthly electricity bill from kWh with block-tier rates, a fixed monthly charge and a tax or fee percentage.

## Output

Returns a structured bill estimate including: total bill, energy charge subtotal, fixed charge, taxes, average price per kWh, unbilled kWh (if usage doesn't fill all tiers), a per-tier breakdown (kWh consumed, rate, and cost for each block), a human-readable summary, and optional disclaimer or degraded-mode flags.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "kwh",
      "tiers"
     ],
     "properties": {
      "kwh": {
       "type": "number",
       "description": "Energy used in the month, kWh (0 to 100000)"
      },
      "tiers": {
       "type": "string",
       "description": "Rate blocks kWh@rate separated by semicolons, last block 'rest@rate', for example '500@0.12; 500@0.15; rest@0.20'; a single 'rest@0.14' is a flat rate"
      },
      "taxPercent": {
       "type": "number",
       "description": "Taxes and percentage fees on the total, 0 to 50 (default 0)"
      },
      "fixedCharge": {
       "type": "number",
       "description": "Fixed monthly service charge (default 0)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "kwh": {
       "type": [
        "null",
        "number"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "taxes": {
       "type": [
        "null",
        "number"
       ]
      },
      "total": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "subtotal": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "fix
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/home-energy-calculators-monthly-electricity-bill-estimator-6b1670f9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from home-energy-calc.x402tookit.com](https://www.zero.xyz/host/home-energy-calc.x402tookit.com/llms.txt)