API · x402

Running cost of any appliance from watts, hours and electricity price: kWh and cost per…

Running cost of any appliance from watts, hours and electricity price: kWh and cost per day, month and year, standby draw share and CO2 estimate.

by Saylor Innovations Knowledge Base · verified provider · updated 2026-10-27

30d calls—

30d payers—

MethodGET

Outputjson

What it does

Running cost of any appliance from watts, hours and electricity price: kWh and cost per day, month and year, standby draw share and CO2 estimate.

Tags: appliance electricity cost · cost to run a space heater · watts to kwh cost · standby power cost per year · monthly electric cost of device

Call contract

Method: GET
Input: query parameters
Output: json

Input example from Bazaar metadata

{
  "hours_per_day": "3",
  "rate_per_kwh": "0.17",
  "standby_watts": "2",
  "watts": "1500"
}

Output example

{
  "watts": 1500,
  "hours_per_day": 3,
  "days_per_year": 365,
  "quantity": 1,
  "kwh_per_day": 4.542,
  "kwh_per_month": 138.153,
  "kwh_per_year": 1657.83,
  "cost_per_hour": 0.255,
  "cost_per_day": 0.7721,
  "cost_per_month": 23.49,
  "cost_per_year": 281.83,
  "standby_share_percent": 0.92,
  "standby_cost_per_year": 2.61,
  "co2_kg_per_year": 663.1,
  "co2_factor_assumed": 0.4,
  "note": "Cost = watts x hours / 1000 x rate. Nameplate watts overstate real draw for appliances that cycle (fridges, heaters), so measure with a plug meter when accuracy matters. The CO2 factor is an assumption you can override.",
  "source": "Energy and cost arithmetic"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/saylorinnovations-api-energy-appliance-cost.json for the price and payment options.
Pay. Call GET https://saylorinnovations.com/api/energy/appliance-cost. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC or USDT or SOL on Base, Polygon, Arbitrum One, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Arbitrum One, Solana

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa	120s
exact	Polygon eip155:137	USDC	$0.01	0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa	120s
exact	Arbitrum One eip155:42161	USDC	$0.01	0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa	120s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.01	7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7	120s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDT	$0.01	7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7	120s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	SOL	$0.01	7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7	120s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
    "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
    "asset": "So11111111111111111111111111111111111111112",
    "amount": "95953",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 120
  }
]

Schemas

Output schema (JSON Schema)

{
  "type": "object",
  "properties": {
    "watts": {
      "type": "number",
      "description": "Power draw used"
    },
    "hours_per_day": {
      "type": "number",
      "description": "Hours in use per day"
    },
    "kwh_per_day": {
      "type": "number",
      "description": "Average energy per day"
    },
    "kwh_per_month": {
      "type": "number",
      "description": "Average energy per month"
    },
    "kwh_per_year": {
      "type": "number",
      "description": "Energy per year including standby"
    },
    "cost_per_hour": {
      "type": "number",
      "description": "Cost of one hour of use"
    },
    "cost_per_day": {
      "type": "number",
      "description": "Average cost per day"
    },
    "cost_per_month": {
      "type": "number",
      "description": "Average cost per month"
    },
    "cost_per_year": {
      "type": "number",
      "description": "Cost per year"
    },
    "standby_share_percent": {
      "type": "number",
      "description": "Share of energy used while off"
    },
    "standby_cost_per_year": {
      "type": "number",
      "description": "Yearly cost of standby draw"
    },
    "co2_kg_per_year": {
      "type": "number",
      "description": "Estimated emissions per year"
    },
    "note": {
      "type": "string",
      "description": "Plain-language caveat about how to read and use the result"
    },
    "source": {
      "type": "string",
      "description": "Where the data or formula comes from"
    },
    "days_per_year": {
      "description": "Days of use per year",
      "type": [
        "number",
        "null"
      ]
    },
    "quantity": {
      "description": "Number of units",
      "type": [
        "number",
        "null"
      ]
    },
    "co2_factor_assumed": {
      "description": "kg CO2 per kWh assumed",
      "type": [
        "number",
        "null"
      ]
    }
  },
  "required": [
    "cost_per_year",
    "kwh_per_year"
  ]
}

Example shape — generated from the schema, not a captured live response

{
  "watts": 0,
  "hours_per_day": 0,
  "kwh_per_day": 0,
  "kwh_per_month": 0,
  "kwh_per_year": 0,
  "cost_per_hour": 0,
  "cost_per_day": 0,
  "cost_per_month": 0,
  "cost_per_year": 0,
  "standby_share_percent": 0,
  "standby_cost_per_year": 0,
  "co2_kg_per_year": 0,
  "note": "string",
  "source": "string",
  "days_per_year": 0,
  "quantity": 0,
  "co2_factor_assumed": 0
}

Examples

curl

curl -X GET 'https://saylorinnovations.com/api/energy/appliance-cost'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

JavaScript

const res = await fetch("https://saylorinnovations.com/api/energy/appliance-cost", {
  "method": "GET"
});
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.request("GET", "https://saylorinnovations.com/api/energy/appliance-cost")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: Saylor Innovations Knowledge Base
Endpoint: https://saylorinnovations.com/api/energy/appliance-cost
Side effects: Paid calls settle the advertised payment; see the provider contract for execution behavior.
Machine-readable: /resources/saylorinnovations-api-energy-appliance-cost.json