Case Studies/CarbonZero GHG Reconciliation
Climate Finance · Carbon Markets · Reporting

10,000+ Transactions.
Zero Manual Reconciliation.

CarbonZero was reconciling 10,000+ carbon offset transactions every month with a single analyst. Real-time reporting was impossible and the entire process depended on one person. Quixas replaced the workflow with a LangGraph + Python pipeline that runs reconciliation at transaction time. Live dashboards, automated audit trails, and volume that scales without headcount.

Industry

Carbon Markets & Climate Finance

Volume

10,000+ transactions per month

Delivered

Real-time reconciliation pipeline

Monthly Reconciliation Load

0 hrs

Manual reconciliation work eliminated

The analyst who ran the monthly cycle now works on strategy and client relationships instead of registry matching.

10K+

Tx processed monthly

~0%

Entry error rate

24/7

Live reporting

Live in production

0

Transactions / month

Processed automatically, real time

0 hrs

Manual reconciliation

Eliminated entirely

~0%

Data-entry error rate

Validated before write

24/7

Live GHG reporting

No more monthly snapshots

The Challenge

A Single Analyst Holding
The Entire Reporting Pipeline.

One analyst responsible for 10,000+ monthly transactions

Every transaction had to be matched against project registry data, validated against GHG methodology, categorised, and entered into the reporting system. The process was accurate but its capacity was capped by one person.

Scale dependency — the workload grew linearly with volume

A month with 12,000 transactions took meaningfully longer than a month with 8,000. As the business grew, the reconciliation timeline grew with it, with no room to catch up.

Real-time reporting was impossible

Clients and partners needed current offset data, but the data only existed in the reporting system after month-end reconciliation. Dashboards were always weeks behind reality.

Single point of failure and compounding error risk

If the analyst was unavailable, reconciliation stopped. Manual data entry at scale introduced errors that cascaded through client dashboards and audit records, each one requiring downstream correction.

What We Built

A Real-Time
Reconciliation Pipeline.

Quixas built an automated reconciliation pipeline using LangGraph and Python that processes every transaction the moment it enters the platform. No batch jobs, no queuing, no month-end scramble.

Transaction Ingestion

Each transaction is captured at the point of entry and passed to the reconciliation pipeline immediately. No batch processing, no end-of-month queuing, no backlog to burn down.

Registry Matching

The pipeline queries the relevant project registry APIs to validate offset attribution for every transaction. The matching logic handles partial matches, methodology variants, and multi-registry transactions that previously required analyst judgment.

GHG Calculation Validation

Every transaction's GHG credit calculation is validated against the applicable methodology. Clean transactions are marked clean. Discrepancies are flagged with the specific issue identified and routed for human review.

Automated Categorisation

Validated transactions are automatically categorised by offset type, project, geography, and vintage year, then written to the reporting database. Categories are defined once and applied consistently across every transaction.

Real-Time Reporting Layer

Because reconciliation happens at transaction time rather than month-end, the reporting layer always reflects current data. Client dashboards are live, not lagged, and GHG tracking is continuous.

Continuous Audit Trail

Every step of the reconciliation, the registry query, the validation result, the categorisation decision, is logged automatically, creating a complete audit trail without any additional data entry.

How the System Works

Ingestion

Event-driven capture

Registry Match

Multi-registry API

Validation

GHG methodology check

Categorisation

Type / project / year

Live Reporting

Dashboards + audit

OrchestrationLangGraph
Data layerPython
Registry APIsCustom connectors per registry
DatabasePostgreSQL
ReportingCustom dashboard layer
Audit loggingAutomated via pipeline
Delivery Timeline

From Month-End Scramble to Real-Time Pipeline.

Week 1-2

Diagnose & Map

Walked the analyst through every step of the monthly cycle, mapped the registry sources, edge cases, and methodology variants, and defined the validation rules.

Week 2-4

Pipeline Build

Built the LangGraph orchestration, transaction ingestion, registry connectors, and validation layer in Python. Modelled the categorisation logic against historical data.

Week 4-6

Reporting & Audit Layer

Wired the reporting database and live dashboards, implemented continuous audit-trail generation, and ran the pipeline in parallel against a back-catalogue of past transactions.

Week 6-8

Cutover & Handoff

Switched the live transaction flow onto the automated pipeline, handed the analyst a human-review queue for flagged discrepancies, and documented runbooks for ongoing ownership.

The Results

Real-Time GHG Tracking
At Any Transaction Volume.

10K+

Transactions processed monthly

Volume growth no longer creates a linear increase in operational burden. The pipeline processes 10,000 or 50,000 transactions with the same overhead.

~0%

Manual data-entry errors

Automated validation and categorisation eliminated the class of errors introduced by manual data entry. Discrepancies are caught before they touch the reporting system.

24/7

Live reporting layer

Reconciliation happens at transaction time. Client dashboards reflect current data continuously rather than delivering monthly snapshots that are already weeks old.

100%

Continuous audit readiness

The audit trail is generated automatically with every transaction rather than assembled retrospectively at the end of each reporting period.

We went from reconciling everything by hand at month-end to having a pipeline that catches issues before they reach the reporting layer. Our analyst now works on the questions that actually need her judgment, not on matching transactions against registries one at a time.
C

Head of Operations

CarbonZero

For Finance, Compliance & Reporting Leaders

Is Your Reconciliation Scaling
With Headcount Instead of Volume?

We have built reconciliation and reporting pipelines that handle 10,000+ transactions per month with no manual touch. In 30 minutes we map your current workflow, identify the automation architecture, and estimate the time saved before any build begins.

Free 30-minute session
ROI calculated before you commit
Pipelines built for 10K+ monthly volume