UK Tariff Unit Rates and Standing Charges, Including Agile Half-Hourly (Octopus Energy)

octopusenergy/tariff-rates

The rates of one UK energy tariff: standard unit rates, day or night unit rates, or the daily standing charge, in pence excluding and including VAT, with the validity window of each. For Agile Octopus this is the half-hourly price series, including tomorrow's prices once published. Newest first, paged, 1 to 100 per page, optionally limited to a period. Give the product code, the fuel and the tariff code from the product record. A tariff or rate type that does not match is refused as a validation error. Octopus Energy public tariff data, passed through unmodified and served by Eden Engine; not an official Octopus Energy product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

Octopus Energy

Tariff data from Octopus Energy's public REST API (developer.octopus.energy), passed through unmodified. Served by Eden Engine; not an official Octopus Energy product.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "octopusenergy/tariff-rates" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "octopusenergy/tariff-rates" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "octopusenergy/tariff-rates", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "octopusenergy/tariff-rates", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

Not connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.

Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 21, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "product_code",
    "fuel",
    "tariff_code",
    "rate_type"
  ],
  "properties": {
    "fuel": {
      "enum": [
        "electricity",
        "gas"
      ],
      "type": "string",
      "description": "electricity or gas; it must match the first letter of the tariff code (E or G)."
    },
    "page": {
      "type": "integer",
      "maximum": 1000,
      "minimum": 1,
      "description": "Page number from 1."
    },
    "page_size": {
      "type": "integer",
      "default": 48,
      "maximum": 100,
      "minimum": 1,
      "description": "Rates per page, 1 to 100. Default 48, one day of half-hourly Agile prices."
    },
    "period_to": {
      "type": "string",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}(:[0-9]{2})?(Z|[+-][0-9]{2}:[0-9]{2})$",
      "description": "End of the period, ISO 8601 with a timezone."
    },
    "rate_type": {
      "enum": [
        "standard-unit-rates",
        "day-unit-rates",
        "night-unit-rates",
        "standing-charges"
      ],
      "type": "string",
      "description": "standard-unit-rates for single-rate tariffs (E-1R, G-1R), day-unit-rates and night-unit-rates for dual-rate tariffs (E-2R), standing-charges for the daily charge."
    },
    "period_from": {
      "type": "string",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}(:[0-9]{2})?(Z|[+-][0-9]{2}:[0-9]{2})$",
      "description": "Start of the period, ISO 8601 with a timezone, for example 2026-10-19T00:00:00Z."
    },
    "tariff_code": {
      "type": "string",
      "pattern": "^[EG]-[1-4]R-[A-Z0-9-]{3,60}-[A-P]$",
      "description": "The regional tariff code from the product record, for example E-1R-AGILE-24-10-01-C (C is London)."
    },
    "product_code": {
      "type": "string",
      "pattern": "^[A-Z0-9][A-Z0-9-]{2,59}$",
      "description": "The product code, for example AGILE-24-10-01."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "count",
    "results"
  ],
  "properties": {
    "next": {
      "type": [
        "string",
        "null"
      ],
      "description": "URL of the next page, or null on the last page."
    },
    "count": {
      "type": "integer",
      "description": "Total number of matching records across all pages."
    },
    "results": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "valid_to": {
            "type": [
              "string",
              "null"
            ],
            "description": "ISO 8601 UTC end of validity; null while open-ended."
          },
          "valid_from": {
            "type": "string",
            "description": "ISO 8601 UTC start of validity."
          },
          "value_exc_vat": {
            "type": "number",
            "description": "Pence per kWh (unit rates) or pence per day (standing charges), excluding VAT."
          },
          "value_inc_vat": {
            "type": "number",
            "description": "The same including VAT."
          },
          "payment_method": {
            "type": [
              "string",
              "null"
            ]
          }
        },
        "additionalProperties": true
      },
      "description": "This page's records; empty when nothing matches."
    },
    "previous": {
      "type": [
        "string",
        "null"
      ],
      "description": "URL of the previous page, or null on the first."
    }
  },
  "description": "The service's paged list of rates, newest `valid_from` first; `count` is the total number of rates in the period (an Agile tariff holds tens of thousands).",
  "additionalProperties": true
}