# ERCOT NP4 179 CD API

**Canonical:** https://apis.io/apis/ercot/ercot-np4-179-cd-api/  
**Provider:** ERCOT — https://apis.io/providers/ercot/  
**Base URL:** https://api.ercot.com/api/public-reports  
**Documentation:** https://developer.ercot.com/applications/pubapi/user-guide/using-api/

ERCOT NP4 179 CD API is one of 41 APIs that [ERCOT](https://apis.io/providers/ercot/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include NP4-179-CD. The published artifact set on APIs.io includes an OpenAPI specification, rate-limit docs, API documentation, a getting-started guide, an API reference, and authentication docs.

<b>Total Ancillary Service Offers</b><br/><br/>The total quantity in MW of Offers per Ancillary Service per hour from the Day-Ahead Market for the last thirty days on a daily basis which includes the following AS types: REGDN, REGUP, RRSPFR, RRSFFR, RRSUFR, & NSPIN.

## Machine-readable artifacts (14)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/ercot/refs/heads/main/openapi/ercot-np4-179-cd-api-openapi.yml
- **Conventions** — https://raw.githubusercontent.com/api-evangelist/ercot/refs/heads/main/conventions/ercot-conventions.yml
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/ercot/refs/heads/main/errors/ercot-problem-types.yml
- **DataModel** — https://raw.githubusercontent.com/api-evangelist/ercot/refs/heads/main/data-model/ercot-data-model.yml
- **RateLimits** — https://raw.githubusercontent.com/api-evangelist/ercot/refs/heads/main/rate-limits/ercot-rate-limits.yml
- **Documentation** — https://developer.ercot.com/applications/pubapi/user-guide/using-api/
- **GettingStarted** — https://developer.ercot.com/applications/pubapi/user-guide/registration-and-authentication/
- **KnownLimits** — https://developer.ercot.com/applications/pubapi/known-limits/
- **APIReference** — https://apiexplorer.ercot.com/api-details#api=pubapi-apim-api
- **Authentication** — https://developer.ercot.com/applications/pubapi/user-guide/registration-and-authentication/
- **RateLimits** — https://developer.ercot.com/applications/pubapi/known-limits/
- **ChangeLog** — https://developer.ercot.com/applications/pubapi/relnotes/
- **Deprecation** — https://developer.ercot.com/applications/pubapi/deprecation-notices/
- **OpenIDConfiguration** — https://ercotb2c.b2clogin.com/ercotb2c.onmicrosoft.com/B2C_1_PUBAPI-ROPC-FLOW/v2.0/.well-known/openid-configuration

## Other ERCOT APIs (12)

- [ERCOT ESR Public Data API](https://apis.io/apis/ercot/ercot-esr-public-data-api/)
- [ERCOT Web Services (EWS)](https://apis.io/apis/ercot/ercot-web-services/)
- [ERCOT MarkeTrak API](https://apis.io/apis/ercot/ercot-marketrak-api/)
- [ERCOT Retail API](https://apis.io/apis/ercot/ercot-retail-api/)
- [ERCOT EMIL Products API](https://apis.io/apis/ercot/ercot-emil-products-api/)
- [ERCOT NP3 233 CD API](https://apis.io/apis/ercot/ercot-np3-233-cd-api/)
- [ERCOT NP3 565 CD API](https://apis.io/apis/ercot/ercot-np3-565-cd-api/)
- [ERCOT NP3 566 CD API](https://apis.io/apis/ercot/ercot-np3-566-cd-api/)
- [ERCOT NP3 910 ER API](https://apis.io/apis/ercot/ercot-np3-910-er-api/)
- [ERCOT NP3 911 ER API](https://apis.io/apis/ercot/ercot-np3-911-er-api/)
- [ERCOT NP3 965 ER API](https://apis.io/apis/ercot/ercot-np3-965-er-api/)
- [ERCOT NP3 966 ER API](https://apis.io/apis/ercot/ercot-np3-966-er-api/)

## Tags

NP4-179-CD

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/ercot/ercot-np4-179-cd-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/ercot/.