# New York Independent System Operator (NYISO)

**Canonical:** https://apis.io/providers/nyiso/  
**Website:** https://www.nyiso.com/  
**APIs profiled:** 6

The New York Independent System Operator (NYISO) is the not-for-profit FERC-jurisdictional entity that operates New York State's bulk electricity grid, administers the state's wholesale energy, capacity and ancillary-services markets, and performs long-term power system planning. Formed in 1999 out of the New York Power Pool, it sits squarely in the wholesale middle of the value chain - between generators, transmission owners and interconnectors on one side and the investor-owned utilities and retail suppliers who actually bill New York consumers on the other. NYISO's API posture is the sector's classic two-speed split, and NYISO lands hard on both ends of it. Market and system data is genuinely open - the MIS public archive at mis.nyiso.com/public serves roughly sixty machine-readable report families (day-ahead and real-time LBMP, actual and forecast load, real-time fuel mix, ATC/TTC, outages, constraints, interface flows, bid data, capacity, uplift, emissions) as daily CSV and monthly ZIP with no account, no key and no referrer check, and the FERC-mandated OASIS node publishes an anonymously listable object store of transmission postings. Consumer data is the exact opposite - there is none, and none is expected, because NYISO holds no retail customer relationships. Every real REST API NYISO documents - the Finance APIs (Metering, Settlements, Invoicing) and the Metering API under api.nyiso.com - is market-participant-only, gated behind an MIS user account plus a NAESB-accredited digital certificate, and every one of those endpoints answers 401 anonymously. The United States has no consumer energy data mandate behind Green Button, and in any case Green Button binds distribution utilities, not system operators, so NYISO carries no Green Button or Consumer Data Right obligation at all.

## Kin Score — 29.1 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 29.1).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 14.1 |
| Governance | 18.2 |
| Contract Governance | 18.2 |
| Operational Transparency | 7.9 |
| Developer Ergonomics | 47.0 |
| Commercial Clarity | 17.1 |
| Access Clarity | 17.1 |

Regulatory layer — **Energy & Utilities**: 28.4 (matched via tags).

## Agent readiness — 13.0 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Free - Open bulk data; REST APIs restricted to market participants — onboarding: open, pricing: free, trial: no (confidence: high).

## APIs (6)

- **NYISO MIS Public Data Archive** — NYISO's Market Information System public archive - the operator's flagship open data surface. Roughly sixty machine-readable report families are published as predictable daily C...
- **NYISO OASIS Postings** — NYISO's Open Access Same-Time Information System (OASIS) node, the FERC Order 889/890 transmission-service transparency surface. The operator front-end at oasis.nyiso.com is a s...
- **NYISO Finance Metering API** — The Metering component of NYISO's Finance APIs - submission and retrieval of hourly revenue-grade meter data for generators, ties and subzones, plus retrieval of calculated subz...
- **NYISO Finance Settlements API** — The Settlements component of NYISO's Finance APIs. The published guide documents GET /v1/stationPower, retrieving station power settlement data by billing month with an optional...
- **NYISO Finance Invoicing API** — 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/dail...
- **NYISO Metering API** — NYISO's standalone Metering API, documented separately from the Finance APIs guide and served from its own root at api.nyiso.com/metering. It covers submission and retrieval of ...

## Security (2)

- **Nyiso Authentication** — none/http/mutualTLS · 3 schemes
- **Nyiso Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Energy, United States, Electricity, Energy Markets, Grid, Open Data, System Operator, New York, Renewables, Emissions

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/nyiso/). Scores are computed from the provider's own public artifacts under a published rubric.