v2.4 — Carbon Measurement API

The carbon ledger for modern infrastructure.

Tanso.tech is the technology platform for measuring, tracking, and verifying carbon flux across global supply chains. Drop in a single SDK, stream signed emission events, settle in seconds.

Start Building Read API Reference →

0 Production Endpoints
0 Regional Nodes
0 Verification Uptime

measure.ts POST /v2/emissions

// Stream a verified carbon event
import { Tanso } from "@tanso/sdk";

const tanso = new Tanso({
  apiKey: process.env.TANSO_KEY,
  region: "eu-north-1"
});

const event = await tanso.emissions.measure({
  asset: "fleet-7042",
  scope: 3,
  fuel: "diesel-b7",
  liters: 128.4
});

// => { id: "evt_a1f9c", co2e_kg: 343.27, hash: "0x9b…" }

signed & settled in 1.8s

Powering carbon accounting at

NORTHWIND
HELIOGRID
VERTEX/CO
OPENCARBON
ARC·LABS
METRA.IO

// platform

Built like a distributed ledger, used like a REST API.

Every emission event is hashed, signed, and replicated across regional nodes. You get cryptographic provenance without the blockchain overhead — just plain JSON over HTTPS.

Verifiable Ledger

Tamper-evident chain of carbon events with Merkle proofs you can audit on demand.

GET /v2/proofs/:id

Realtime Streams

Subscribe to emission events over WebSocket or Server-Sent Events with sub-second latency.

WS /v2/stream

Emission Oracles

Pre-built coefficients for 1,400+ fuel and material types, refreshed against IPCC AR6.

GET /v2/factors

Instant Settlement

Net carbon balances reconciled across counterparties without escrow or middlemen.

POST /v2/settle

Regulator-Ready

Exports for CSRD, SEC Climate, ISSB S2, and CDP. Schemas signed by accredited auditors.

GET /v2/exports

SDKs Everywhere

First-class libraries for TypeScript, Python, Go, Rust, Elixir, and a thin C ABI.

npm i @tanso/sdk

// integrations

Plug carbon data into the stack you already run.

Tanso connects to the data warehouses, observability platforms, and ERPs your team already uses. Pick a target, paste a snippet, ship.

Snowflake

Stream events into a managed share

CREATE TABLE emissions
  USING tanso_share('eu-north-1');

SHARE tanso.public.events

Datadog

Carbon as a first-class metric

tanso.emit({
  metric: "co2e.kg",
  tags: ["env:prod"]
});

POST /api/v1/series

SAP

SAP S/4HANA

Bind events to procurement docs

SELECT co2e FROM tanso.flux
WHERE po_id = '4500023871';

ODATA /tanso/flux

Kubernetes

Per-pod compute carbon

annotations:
  tanso.io/scope: "2"
  tanso.io/region: "eu-north-1"

CRD tanso.io/v1

Python & Pandas

Notebook-ready dataframes

from tanso import Client
df = Client().scan("fleet/*")

pip install tanso

GitHub Actions

CI carbon budget gates

- uses: tanso/budget-gate@v2
  with:
    threshold: "50kg"

action tanso/budget-gate

// live network

Watch the network breathe.

Every measurement currently flowing through the Tanso mainnet, sampled at one-second intervals. No replays, no proxies — this is the live feed.

Networktanso-mainnet
ConsensusHotStuff-2
Avg. settlement1.74s
Block height8,402,117

LIVE — eu-north-1 GET /v2/flux

CO₂e 0 kg / s

--:--:-- evt_------ -- --

// documentation

Read the spec, ship in an afternoon.

Our reference is the source of truth, with runnable examples, type definitions, and signed schemas. Built for engineers who skim.

Open Reference View on GitHub→

POST /v2/emissions Record an emission event → GET /v2/proofs/:id Fetch a Merkle proof → WS /v2/stream Subscribe to live events → POST /v2/settle Net balances between parties → GET /v2/factors Browse emission coefficients →

Ship carbon-aware code today.

Spin up a sandbox key in under a minute. Free for the first million events, no credit card.

Get API Key Talk to Engineering→