# NYISO Finance Invoicing API

**Canonical:** https://apis.io/apis/nyiso/nyiso-finance-invoicing-api/  
**Provider:** New York Independent System Operator (NYISO) — https://apis.io/providers/nyiso/  
**Base URL:** https://api.nyiso.com/finance/invoicing  
**Documentation:** https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa

NYISO Finance Invoicing API is one of 6 APIs that [New York Independent System Operator (NYISO)](https://apis.io/providers/nyiso/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Invoicing, Settlement, Electricity, and Market Participants. The published artifact set on APIs.io includes API documentation and an API reference.

The Invoicing component of NYISO's Finance APIs, retrieving daily reconciliation data for both settlements dollars and energy volumes. The published guide documents GET /v1/dailyReconciliation/dollar and GET /v1/dailyReconciliation/mwh, parameterised by start date and an optional version, returning JSON with two decimals of dollar precision and four decimals of MWh precision. Restricted to NYISO market participants - MIS user account and password via HTTP Basic plus the associated NAESB certificate on every request. Both the root and /v1/dailyReconciliation/dollar returned 401 Authorization Required to anonymous probes on 2026-07-27.

## Machine-readable artifacts (4)

- **Documentation** — https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
- **Documentation** — https://www.nyiso.com/billings-and-settlements
- **APIReference** — https://www.nyiso.com/documents/20142/45334160/NYISO%20Finance%20APIs%20User's%20Guide%20v1.2%20-%20DRAFT.pdf/4f0de58a-783d-a317-64fe-caed77ba61fa
- **Sandbox** — https://raw.githubusercontent.com/api-evangelist/nyiso/refs/heads/main/sandbox/nyiso-sandbox.yml

## Other New York Independent System Operator (NYISO) APIs (5)

- [NYISO MIS Public Data Archive](https://apis.io/apis/nyiso/nyiso-mis-public-data/)
- [NYISO OASIS Postings](https://apis.io/apis/nyiso/nyiso-oasis-postings/)
- [NYISO Finance Metering API](https://apis.io/apis/nyiso/nyiso-finance-metering-api/)
- [NYISO Finance Settlements API](https://apis.io/apis/nyiso/nyiso-finance-settlements-api/)
- [NYISO Metering API](https://apis.io/apis/nyiso/nyiso-metering-api/)

## Tags

Invoicing, Settlement, Electricity, Market Participants

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/nyiso/nyiso-finance-invoicing-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/nyiso/.