fourzerotwo-si Gb Electricity API
GB Electricity Grid: Live and forecast Great Britain electricity data: generation mix, demand, wind, prices, interconnectors, margins, frequency and plant outages.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Fourzerotwo Si Gb Electricity API
version: 1.1.0
contact:
url: https://fourzerotwo.si
description: 'Operations tagged gb-electricity across 2 of this provider''s published API definitions: openapi.json, fourzerotwo-si-openapi.json. Each path carries the servers of the definition it was published in.'
servers:
- url: https://fourzerotwo.si
tags:
- name: gb-electricity
description: 'GB Electricity Grid: Live and forecast Great Britain electricity data: generation mix, demand, wind, prices, interconnectors, margins, frequency and plant outages.'
paths:
/v1/gb-electricity/generation-now:
get:
operationId: gb_electricity__generation_now
summary: 'GB Electricity Grid: Generation mix now'
description: 'Current GB generation by fuel type (MW and %), latest 5-minute reading and last half hour / 24 hours. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/generation-now
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__generation-now
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/generation-today:
get:
operationId: gb_electricity__generation_today
summary: 'GB Electricity Grid: Generation by type, 24h'
description: 'Actual generation by production type over the last 24 hours (solar, wind, nuclear, gas…). Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/generation-today
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__generation-today
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/generation-history:
get:
operationId: gb_electricity__generation_history
summary: 'GB Electricity Grid: Generation mix history'
description: 'Half-hourly generation by fuel type, recent history. Price: $0.002 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/generation-history
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.002000'
x-free-tier: free
x-mcp-tool: gb-electricity__generation-history
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/interconnectors:
get:
operationId: gb_electricity__interconnectors
summary: 'GB Electricity Grid: Interconnector flows'
description: 'Latest half-hourly flows on each interconnector (France, Norway, Netherlands, Belgium, Ireland, Denmark…), newest first. Price: $0.002 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/interconnectors
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.002000'
x-free-tier: free
x-mcp-tool: gb-electricity__interconnectors
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/interconnector-list:
get:
operationId: gb_electricity__interconnector_list
summary: 'GB Electricity Grid: Interconnectors'
description: 'Every GB interconnector and the bidding zone it connects to. Price: $0.0005 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/interconnector-list
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.000500'
x-free-tier: free
x-mcp-tool: gb-electricity__interconnector-list
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/demand-outturn:
get:
operationId: gb_electricity__demand_outturn
summary: 'GB Electricity Grid: Demand outturn'
description: 'Initial national and transmission demand, half-hourly, last ~2 days. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/demand-outturn
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__demand-outturn
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/demand-daily:
get:
operationId: gb_electricity__demand_daily
summary: 'GB Electricity Grid: Daily demand'
description: 'Total national demand per day, recent days. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/demand-daily
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__demand-daily
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/demand-peak:
get:
operationId: gb_electricity__demand_peak
summary: 'GB Electricity Grid: Peak demand'
description: 'Daily peak transmission demand. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/demand-peak
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__demand-peak
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/demand-forecast:
get:
operationId: gb_electricity__demand_forecast
summary: 'GB Electricity Grid: Demand forecast, day ahead'
description: 'Half-hourly national and transmission demand forecast for the next day. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/demand-forecast
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__demand-forecast
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/demand-forecast-14d:
get:
operationId: gb_electricity__demand_forecast_14d
summary: 'GB Electricity Grid: Demand forecast, 14 days'
description: 'Daily peak demand forecast for the next two weeks. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/demand-forecast-14d
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__demand-forecast-14d
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/demand-forecast-52w:
get:
operationId: gb_electricity__demand_forecast_52w
summary: 'GB Electricity Grid: Demand forecast, 52 weeks'
description: 'Weekly peak demand forecast for the year ahead. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/demand-forecast-52w
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__demand-forecast-52w
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/wind-forecast:
get:
operationId: gb_electricity__wind_forecast
summary: 'GB Electricity Grid: Wind forecast'
description: 'Current wind generation forecast, half-hourly, for the next ~2 days. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/wind-forecast
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__wind-forecast
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/wind-forecast-peak:
get:
operationId: gb_electricity__wind_forecast_peak
summary: 'GB Electricity Grid: Wind forecast daily peak'
description: 'Forecast peak wind generation for each day. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/wind-forecast-peak
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__wind-forecast-peak
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/indicated-forecast:
get:
operationId: gb_electricity__indicated_forecast
summary: 'GB Electricity Grid: Indicated demand & generation'
description: 'Day-ahead indicated demand, generation, imbalance and margin. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/indicated-forecast
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__indicated-forecast
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/capacity-forecast:
get:
operationId: gb_electricity__capacity_forecast
summary: 'GB Electricity Grid: Generation capacity, 14 days'
description: 'Forecast available generation capacity by fuel type for the next two weeks. Price: $0.002 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/capacity-forecast
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.002000'
x-free-tier: free
x-mcp-tool: gb-electricity__capacity-forecast
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/margin-forecast:
get:
operationId: gb_electricity__margin_forecast
summary: 'GB Electricity Grid: Margin forecast'
description: 'Daily operating margin forecast (OCNMFD2), days 2–14. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/margin-forecast
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__margin-forecast
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/surplus-forecast:
get:
operationId: gb_electricity__surplus_forecast
summary: 'GB Electricity Grid: Surplus forecast'
description: 'Daily generating plant surplus forecast, days 2–14. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/surplus-forecast
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__surplus-forecast
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/system-prices:
get:
operationId: gb_electricity__system_prices
summary: 'GB Electricity Grid: Imbalance (system) prices'
description: 'System sell/buy price and net imbalance volume for every settlement period of a day. Price: $0.002 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/system-prices
parameters:
- name: date
in: query
required: true
description: Settlement date YYYY-MM-DD
schema:
type: string
maxLength: 20
example: '2026-10-10'
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.002000'
x-free-tier: free
x-mcp-tool: gb-electricity__system-prices
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/acceptances-latest:
get:
operationId: gb_electricity__acceptances_latest
summary: 'GB Electricity Grid: Latest balancing acceptances'
description: 'Most recent bid-offer acceptances issued by the system operator. Price: $0.002 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/acceptances-latest
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.002000'
x-free-tier: free
x-mcp-tool: gb-electricity__acceptances-latest
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/frequency:
get:
operationId: gb_electricity__frequency
summary: 'GB Electricity Grid: System frequency'
description: 'Grid frequency (Hz) every 15 seconds, last hour. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/frequency
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__frequency
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/temperature:
get:
operationId: gb_electricity__temperature
summary: 'GB Electricity Grid: GB temperature'
description: 'Daily GB average temperature against seasonal reference values (drives demand). Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/temperature
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__temperature
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/warnings:
get:
operationId: gb_electricity__warnings
summary: 'GB Electricity Grid: System warnings'
description: 'System operator warnings and notices (margin notices, SO-SO trades, electricity capacity warnings). Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/warnings
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__warnings
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/outages:
get:
operationId: gb_electricity__outages
summary: 'GB Electricity Grid: REMIT outage notices'
description: 'Outage and unavailability messages published between two times (ids; fetch each with outage). Price: $0.002 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/outages
parameters:
- name: from
in: query
required: true
description: From (ISO time, e.g. 2026-10-10T00:00Z)
schema:
type: string
maxLength: 25
example: 2026-10-10T00:00Z
- name: to
in: query
required: true
description: To (ISO time)
schema:
type: string
maxLength: 25
example: 2026-10-10T06:00Z
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.002000'
x-free-tier: free
x-mcp-tool: gb-electricity__outages
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/outage:
get:
operationId: gb_electricity__outage
summary: 'GB Electricity Grid: REMIT outage detail'
description: 'One outage notice: plant, fuel, normal/available capacity, cause and event window. Price: $0.001 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/outage
parameters:
- name: id
in: query
required: true
description: Message id from outages
schema:
type: integer
example: 923953
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.001000'
x-free-tier: free
x-mcp-tool: gb-electricity__outage
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/wind-solar:
get:
operationId: gb_electricity__wind_solar
summary: 'GB Electricity Grid: Wind & solar outturn'
description: 'Actual or estimated wind (on/offshore) and solar generation between two dates. Price: $0.002 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/wind-solar
parameters:
- name: from
in: query
required: true
description: Start date YYYY-MM-DD
schema:
type: string
maxLength: 20
example: '2026-10-09'
- name: to
in: query
required: true
description: End date YYYY-MM-DD
schema:
type: string
maxLength: 20
example: '2026-10-10'
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.002000'
x-free-tier: free
x-mcp-tool: gb-electricity__wind-solar
servers:
- url: https://fourzerotwo.si
/v1/gb-electricity/market-index:
get:
operationId: gb_electricity__market_index
summary: 'GB Electricity Grid: Wholesale market index price'
description: 'Market Index Data: half-hourly wholesale price (£/MWh) and volume between two dates. Price: $0.002 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- gb-electricity
externalDocs:
url: https://fourzerotwo.si/apis/gb-electricity/market-index
parameters:
- name: from
in: query
required: true
description: Start date YYYY-MM-DD
schema:
type: string
maxLength: 20
example: '2026-10-09'
- name: to
in: query
required: true
description: End date YYYY-MM-DD
schema:
type: string
maxLength: 20
example: '2026-10-10'
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.002000'
x-free-tier: free
x-mcp-tool: gb-electricity__market-index
servers:
- url: https://fourzerotwo.si
components:
responses:
PaymentRequired:
description: x402 payment required. The body (also base64 in the PAYMENT-REQUIRED header) lists accepted payments.
headers:
PAYMENT-REQUIRED:
schema:
type: string
description: Base64 JSON x402 v2 PaymentRequired
content:
application/json:
schema:
type: object
properties:
x402Version:
type: integer
error:
type: string
accepts:
type: array
items:
type: object
Error:
description: 400 = invalid input, 404 = not found at the source, 502 = the source failed. Never charged.
content:
application/json:
schema:
type: object
properties:
error:
type: string
charged:
type: boolean
securitySchemes:
freeKey:
type: apiKey
in: header
name: X-API-Key
description: Optional free key (fzt_…) for the free tier.
x-refined-from:
- openapi.json
- fourzerotwo-si-openapi.json