The Carbon Accounting
API for Engineers
Programmatic GHG quantification, tamper-evident SHA-256 audit ledgering, and Model Context Protocol (MCP) integrations. Build climate software that directly preserves the biosphere.
POST zerocarbon.org.in/api/v1/calculate/electricityEngineered for Modern Stacks & International Audit Frameworks
(Working towards compliance & statutory assurance across global ESG standards)
Type-Safe SDKs.
Deterministic Calculations.
Execute live requests against the ZeroCarbon calculation kernel. Every query resolves published national emission factors and cites the source and edition of each one it uses.
Build on a Trusted API Foundation
Everything you need to integrate carbon accounting, deterministic emission calculations, and compliance reporting into your workflows.
Unified Carbon Data API
Compute Scope 1, 2, and 3 emissions for electricity, fuel, flights, and spend from one REST API, with the emission factor, its source, and the formula in every response.
Plain JSON over HTTPS
No SDK to install: call the endpoints with fetch, requests, or curl. Electricity, fuel, and flight calculations work without a key in a rate-limited test mode.
Verifier-Ready Compliance Reporting
Generate SEBI BRSR Core, GHG Protocol, and CDP-aligned reporting outputs with traceable calculation lineage and consistent schema validation.
Grid Factors & Emissions Monitoring
Access national grid Central Electricity Authority (CEA) emission factors, multi-facility tracking, and deterministic calculations with the factor and formula in every response.
Production Endpoints & Protocol
Documented with OpenAPI 3.1, enforcing strict schema validation and generating verifiable execution hashes for statutory compliance.
Connect AI Coding Agents directly to ZeroCarbon
Add the ZeroCarbon MCP server URL to any MCP client that supports remote servers. Calculation tools work without a key; tools that read or write your company data need an API key.
https://zerocarbon.org.in/api/v1/mcp/api/v1/calculate/electricityGrid Electricity
Location-based Scope 2 from kWh, using the national grid average for the country (CEA for India, DESNZ for the UK). Returns the factor, its source and the formula.
/api/v1/calculate/fuelFuel Combustion
Petrol, diesel, natural gas, LPG, CNG, coal and furnace oil, in the unit each fuel is sold in. A unit that does not fit the fuel is refused rather than converted.
/api/v1/calculate/flightBusiness Travel
Air travel priced per passenger-km. The distance is never guessed from a route: without distance_km the API refuses with a reason code instead of estimating.
/api/v1/calculate/spendSpend-Based Estimate
EEIO estimate for purchased goods and services from Indian input-output tables, in INR. Needs an API key from your dashboard; without one it returns 401.
/api/v1/calculate/electricityTransparent Developer Tiers
Predictable pricing with included developer API keys on Enterprise tiers. No hidden per-call overage traps.
Starter
For a one-plant CBAM exporter or a small supplier, with the API and MCP server included.
$99 / month · ₹49,999 a year
Plan Scope:
- 10,000 API calls a month
- 100 documents read a month
- 75 Cowork tasks a month
- EU CBAM and GHG inventory exports
- Unlimited team members
Growth
For multi-site exporters and listed companies: more volume, BRSR and connected apps.
$349 / month · ₹1,49,999 a year
Plan Scope:
- Everything in Starter
- 100,000 API calls a month
- Up to 5 sites, 500 documents, 300 Cowork tasks
- BRSR and BRSR Core, PACT footprint exchange
- Connected apps (Tally, Gmail, Microsoft 365, Zoho)
- Live uptime on the status page
Enterprise
For large exporters and groups: high volume, your own factors and named support.
From $12,000 a year
Plan Scope:
- Everything in Growth
- 1 million API calls a month
- 15 sites, 2,000 documents, 1,500 Cowork tasks
- Your own emission factors
- Named onboarding and support
Integrate the planetary carbon kernel
into your application today
Instant API credentials, type-safe SDKs, and autonomous MCP server deployment.