ExchangeRebel Emission Factors API
The Emission Factors API from ExchangeRebel — 4 operation(s) for emission factors.
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curl "https://apis.io/api/v1/apis/exchangerebel-com:exchangerebel-com-emission-factors-api"
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OpenAPI Specification
openapi: 3.2.0
info:
title: ExchangeRebel — pay-per-call APIs for AI agents (x402 on…
version: 1.0.0
contact:
name: 'ExchangeRebel (operator: Rebel Data)'
url: https://exchangerebel.com
email: sound.money.investing@gmail.com
x-guidance: 'All paid operations use x402 on Solana: call without payment to get a 402 challenge (SOL recipient + USDC token account + fresh memo), pay with the memo attached via the Solana Memo program, then retry with header X-Payment-Tx: <signature> and ?toll_memo=<memo>. Challenges are dual-version: the PAYMENT-REQUIRED header carries the x402 v2 PaymentRequired object and the response body carries the same challenge in x402 v1 form for compatibility. Free operations (security: []) include each service''s /health catalog with full response shapes. Prices in x-payment-info are USD per call unless the summary says otherwise (RPC is per 1,000-request block; Telegram provisioning is per bot-month; transcription is per minute of audio).'
description: '67 data and utility APIs behind x402 tolls, settled in SOL or USDC on Solana. Call a paid endpoint without payment to receive a 402 x402 challenge (recipient + fresh memo), pay with the memo attached via the Solana Memo program, then retry with the X-Payment-Tx header and toll_memo query parameter. Free catalog/health endpoints are marked without x-payment-info. Full catalogs: GET /toll/discovery and each service''s /health.'
servers:
- url: https://exchangerebel.com
tags:
- name: Emission Factors
paths:
/toll/emissions/calculate:
post:
tags:
- Emission Factors
summary: Calculate CO2e for one activity from a published factor
responses:
'200':
description: Success. Response shape is documented in the service catalog (GET /health on the service).
content:
application/json:
example:
ok: true
paid_with: onchain
factor_id: epa-egrid-us
record_id: epa-egrid-us-2023
activity: Electricity — U.S. national average, total output rate
quantity: 2000
unit: kWh
factor:
value_kg_co2e_per_unit: 0.3496671006
unit: kg CO2e per kWh
original_value: 770.884
original_unit: lb CO2e per MWh
conversion: 'lb/MWh → kg/kWh: × 0.45359237 (lb→kg) ÷ 1000 (MWh→kWh); source field USC2ERTA in sheet US23'
result_kg_co2e: 699.334201
vintage_used: 2023
vintage_selection: latest_default
estimate: Estimate — computed from a published average emission factor; not a measured emission.
disclaimer: Factors are published averages provided as-is with no warranty. DESNZ factors are licensed under the Open Government Licence v3.0; EPA data is public domain. Neither DESNZ nor the U.S. Environmental Protection Agency endorses this service.
provenance:
source: EPA eGRID
source_detail: U.S. EPA eGRID2023 (data year 2023), rev2 (June 2025), sheet US23
vintage: 2023
scope: Scope 2
category: Electricity (eGRID)
activity: Electricity — U.S. national average, total output rate
source_row: eGRID2023 rev2 workbook, sheet 'US23', row key 'US', field USC2ERTA
licence: Public domain (U.S. EPA)
attribution: U.S. Environmental Protection Agency, eGRID2023 (data year 2023), released January 2025 (rev2, June 2025).
vintage_note: Year omitted — the latest vintage (2023) was used and is disclosed here. Pass year explicitly to pin a vintage.
envelope:
v: 1
service: emission-factors
as_of: '2026-10-16T00:00:00Z'
source: DESNZ (UK Government GHG Conversion Factors) / U.S. EPA (eGRID, GHG Emission Factors Hub)
grade: official
changes:
supported: false
'402':
description: 'Payment Required (x402). The PAYMENT-REQUIRED response header carries the x402 v2 PaymentRequired object (base64 JSON: scheme, CAIP-2 network, amount, asset, payTo, plus the bazaar discovery extension); the response body carries the same challenge in x402 v1 form for compatibility, naming the SOL recipient and USDC token account on Solana plus a fresh memo. To pay on this service''s rail: pay with the memo attached (Solana Memo program), then retry with header ''X-Payment-Tx: <transaction signature>'' and query parameter ''toll_memo=<memo>''.'
requestBody:
content:
application/json:
schema:
type: object
properties:
factor_id:
type: string
description: string (required) - factor id from GET /toll/emissions/factors (base id or full record id incl. vintage)
quantity:
type: number
description: number (required) - activity quantity in the factor's unit (must be > 0)
year:
type: integer
description: integer - optional activity year selecting the factor vintage; omitted = latest vintage, disclosed in the answer
required:
- factor_id
- quantity
x-payment-info:
protocols:
- x402
price:
mode: fixed
currency: USD
amount: '0.005'
security:
- x402Payment: []
operationId: postTollEmissionsCalculate
x-operation-id-source: derived
/toll/emissions/calculate/batch:
post:
tags:
- Emission Factors
summary: Calculate CO2e for up to 100 activities in one call
responses:
'200':
description: Success. Response shape is documented in the service catalog (GET /health on the service).
content:
application/json:
example:
ok: true
item_count: 100
items:
- factor_id: desnz-uk-electricity-electricity-generated-electricity-uk-kwh-kwh
record_id: desnz-uk-electricity-electricity-generated-electricity-uk-kwh-kwh-2026
activity: 'UK electricity — Electricity generated — Electricity: UK — kWh'
quantity: 1
unit: kWh
factor:
value_kg_co2e_per_unit: 0.13096
unit: kg CO2e per kWh
original_value: 0.13096
original_unit: kg CO2e per kWh
conversion: null
components_kg_co2e_per_unit:
co2: 0.12943
ch4: 0.00067
n2o: 0.00086
result_kg_co2e: 0.13096
vintage_used: 2026
vintage_selection: explicit
estimate: Estimate — computed from a published average emission factor; not a measured emission.
disclaimer: Factors are published averages provided as-is with no warranty. DESNZ factors are licensed under the Open Government Licence v3.0; EPA data is public domain. Neither DESNZ nor the U.S. Environmental Protection Agency endorses this service.
provenance:
source: DESNZ
source_detail: 'Greenhouse gas reporting: conversion factors 2026 (GOV.UK, published 2026-06-10; flat file revised July 2026)'
vintage: 2026
scope: Scope 2
category: UK electricity
activity: 'UK electricity — Electricity generated — Electricity: UK — kWh'
source_row: DESNZ flat-format workbook, sheet 'Factors by Category', ID 7_400_4000_5_1 (kg CO2e total row of ID stem 7_400_4000_5)
licence: Open Government Licence v3.0
attribution: Contains public sector information licensed under the Open Government Licence v3.0.
total_kg_co2e: 13.096
estimate: Estimate — computed from a published average emission factor; not a measured emission.
envelope:
v: 1
service: emission-factors
as_of: '2026-10-16T00:00:00Z'
source: DESNZ (UK Government GHG Conversion Factors) / U.S. EPA (eGRID, GHG Emission Factors Hub)
grade: official
changes:
supported: false
paid_with: onchain
disclaimer: Factors are published averages provided as-is with no warranty. DESNZ factors are licensed under the Open Government Licence v3.0; EPA data is public domain. Neither DESNZ nor the U.S. Environmental Protection Agency endorses this service.
'402':
description: 'Payment Required (x402). The PAYMENT-REQUIRED response header carries the x402 v2 PaymentRequired object (base64 JSON: scheme, CAIP-2 network, amount, asset, payTo, plus the bazaar discovery extension); the response body carries the same challenge in x402 v1 form for compatibility, naming the SOL recipient and USDC token account on Solana plus a fresh memo. To pay on this service''s rail: pay with the memo attached (Solana Memo program), then retry with header ''X-Payment-Tx: <transaction signature>'' and query parameter ''toll_memo=<memo>''.'
requestBody:
content:
application/json:
schema:
type: object
properties:
items:
type: array
description: 'array (required) - 1-100 calculation items, each {factor_id: string, quantity: number, year?: integer}'
items:
type: string
required:
- items
x-payment-info:
protocols:
- x402
price:
mode: fixed
currency: USD
amount: '0.05'
security:
- x402Payment: []
operationId: postTollEmissionsCalculateBatch
x-operation-id-source: derived
/toll/emissions/factors:
get:
tags:
- Emission Factors
summary: 'Emission factor catalog: metadata only, no values'
responses:
'200':
description: Success. Response shape is documented in the service catalog (GET /health on the service).
security: []
operationId: getTollEmissionsFactors
x-operation-id-source: derived
/toll/emissions/health:
get:
tags:
- Emission Factors
summary: Check the emission factors service status
responses:
'200':
description: Success. Response shape is documented in the service catalog (GET /health on the service).
security: []
operationId: getTollEmissionsHealth
x-operation-id-source: derived
components:
securitySchemes:
x402Payment:
type: apiKey
in: header
name: X-Payment-Tx
description: 'x402 toll payment proof: the Solana transaction signature of a payment carrying the memo from the 402 challenge; send together with ?toll_memo=<memo>. Payment itself is made on-chain in SOL or USDC to the recipient named in the challenge.'