Vistra Corp
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.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles Vistra Corp the way a machine reads it — 1 machine-readable artifact, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Vistra Corp scores 13.5/100 (emerging), with a separate agent-readiness read of 3/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
Put this on your own site. The badge is drawn live from Vistra Corp's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/vistra-energy/"
title="Vistra Corp on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/vistra-energy.svg"
alt="Vistra Corp Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/vistra-energy/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/vistra-energy/"
title="Vistra Corp on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/vistra-energy/card.svg"
alt="Vistra Corp Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Vistra Corp
Each block below is one kind of artifact we hold for Vistra Corp. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Vistra Corp — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 1
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 1
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 7
The organization behind the API
Scroll within the panel for all 7 ·
Other 12
Properties that don't map to a standard resource type
Scroll within the panel for all 12 ·
← All providers · Data indexed from github.com/api-evangelist/vistra-energy · machine-readable index on apis.io
This is an independent, third-party profile of Vistra Corp, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
·
Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and
you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.