# Vistra Corp

**Canonical:** https://apis.io/providers/vistra-energy/  
**Website:** https://www.vistracorp.com/  
**APIs profiled:** 0

Vistra Corp (NYSE: VST) is an Irving, Texas integrated retail electricity and power generation company and the largest competitive power generator in the United States, operating roughly 41,000-44,000 MW of natural gas, nuclear, coal, solar and battery storage capacity alongside a retail business serving nearly 5 million residential, commercial and industrial customers across 16 states and the District of Columbia through TXU Energy, Dynegy, Ambit Energy, Energy Harbor, Homefield Energy and U.S. Gas & Electric. Its home market is the United States, where it sits on both sides of the competitive value chain, a merchant generator selling into ERCOT, PJM, ISO-NE, NYISO, MISO and CAISO, and a retail electricity provider (REP) reselling that power to end customers. Its API posture is honestly none. No developer portal, no API subdomain and no machine-readable contract of any kind was found: developer., developers., docs., api. and data. on vistracorp.com do not resolve; /developers, /api, /docs, /data, /openapi.json, /swagger.json and /.well-known/openid-configuration all return 404; and TXU Energy's 758-URL sitemap contains no developer or API page. The United States has no consumer energy data mandate. Green Button is an NAESB/NIST ESPI standard adopted voluntarily, and TXU Energy appears on the US Department of Energy's list of "Utilities Committed to Implementing Green Button", a 2012-era commitment list and not evidence of a live endpoint. The only customer-data surface found is Download-My-Data-style export behind the TXU Energy MyAccount login, whose interval readings are themselves sourced from Smart Meter Texas, the shared ERCOT meter-data platform operated by the transmission and distribution utilities (Oncor, CenterPoint, AEP Texas, TNMP) rather than by Vistra. Because Vistra is a retailer and generator and not a wires company, the third-party interval-data API in its home Texas market belongs to Smart Meter Texas and not to Vistra. Vistra likewise publishes no open market or grid data of its own; ERCOT, the other ISOs/RTOs and the EIA publish the market data about Vistra's fleet. Both sides are therefore closed at the company boundary. Not to be confused with Vistra Limited (vistra.com), the unrelated corporate-services and fund-administration firm that does run a real API developer portal at devportal.vistra.com.

## Kin Score — 15.4 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 15.4).

| Facet | Score |
|---|---|
| Discoverability | 68.5 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 16.7 |
| Commercial Clarity | 21.1 |
| Access Clarity | 21.1 |

Regulatory layer — **Energy & Utilities**: 25.7 (matched via tags).

## Agent readiness — 3.4 (human-only)

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

## Security (1)

- **Vistra Energy Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Energy, United States, Utilities, Electricity, Natural Gas, Power Generation, Retail Energy, Smart Metering, Green Button, Energy Markets, Nuclear, Solar, Battery Storage, Texas, ERCOT

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