SemGroup

SemGroup Corporation was a Tulsa, Oklahoma midstream energy service provider that gathered, transported, stored, processed, and marketed crude oil, refined products, and natural gas liquids across North America, and operated the Houston Fuel Oil Terminal (HFOTCO) on the Houston Ship Channel. Energy Transfer LP acquired SemGroup in a $5.1 billion transaction that closed on December 5, 2019; the company was absorbed into Energy Transfer, its NYSE listing retired, and www.semgroup.com now redirects to energytransfer.com. SemGroup never operated a public developer program or API.

SemGroup is profiled on the APIs.io network. Tagged areas include Energy, Midstream, Oil and Gas, Pipelines, and Crude Oil.

🌐 Visit website 📡 Profile data on GitHub

2.8/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

0 APIs

Energy Midstream Oil and Gas Pipelines Crude Oil Natural Gas Liquids Terminal Acquired Fortune 1000

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 2.8/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.0 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Energy & Utilities regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →

13 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points Ask about this →
Developer Ergonomics scores 0.0 — up to +20.0 composite points Ask about this →
Access Clarity scores 0.0 — up to +20.0 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/semgroup/apis.yml: open an issue on github.com/api-evangelist/semgroup to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

SemGroup Domain Security

DMARC

SECURITY

Press 5

Recent news and press coverage referencing this provider.

SemGroup buying Houston Fuel Oil Terminal Co. in $2B deal

SemGroup's $3.2 billion failure shocks backers

XBRL Viewer

Producers Back SemGroup Reorganization Plan

Energy Transfer's AI Strategy: Analysis of Dominance in ...

Resources

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

ParentCompany

ParentCompany

Source (apis.yml)

name: SemGroup
aid: semgroup
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
specificationVersion: '0.23'
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: none
  source:
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/semgroup.png
tags:
- Energy
- Midstream
- Oil and Gas
- Pipelines
- Crude Oil
- Natural Gas Liquids
- Terminal
- Acquired
- Fortune 1000
tags_raw:
- Energy
- Midstream
- Oil and Gas
- Pipelines
- Crude Oil
- Natural Gas Liquids
- Terminals
- Acquired
- Fortune 1000
url: https://raw.githubusercontent.com/api-evangelist/semgroup/refs/heads/main/apis.yml
created: '2026-03-24'
modified: '2026-09-04'
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
apis: []
common:
- type: ParentCompany
  url: https://apis.io/providers/energy-transfer/
  name: Energy Transfer
  x-relationship: acquired
  x-evidence: SemGroup was a midstream service provider that gathered, transported, stored, processed, and marketed crude
    oil, refined products, and natural gas liquids before being acquired by Energy Transfer.
- type: DomainSecurity
  url: security/semgroup-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/semgroup-corporation
- type: Website
  url: https://www.semgroup.com
  x-evidence: Probed 2026-09-04. HTTPS fails TLS (certificate subject does not cover www.semgroup.com); over HTTP the host
    answers 302 on every path and lands on https://www.energytransfer.com/ (200). The domain is still registered to Energy
    Transfer Partners, L.P. but no longer serves a SemGroup site of its own.
description: SemGroup Corporation was a Tulsa, Oklahoma midstream energy service provider that gathered, transported, stored,
  processed, and marketed crude oil, refined products, and natural gas liquids across North America, and operated the Houston
  Fuel Oil Terminal (HFOTCO) on the Houston Ship Channel. Energy Transfer LP acquired SemGroup in a $5.1 billion transaction
  that closed on December 5, 2019; the company was absorbed into Energy Transfer, its NYSE listing retired, and www.semgroup.com
  now redirects to energytransfer.com. SemGroup never operated a public developer program or API.
x-enrichment:
  date: '2026-09-04'
  status: minimal
  artifacts_added: 1
  pass: local-v3
x-coverage:
  state: none
  reason: defunct
  detail: SemGroup ceased to exist as a company when its merger into Energy Transfer LP closed on 2019-12-05; www.semgroup.com
    now answers 302 on every path — including every /.well-known/ and spec path probed — and lands on Energy Transfer's corporate
    site, while the semgroup.com apex has no A record at all.
  evidence:
  - url: http://www.semgroup.com/
    status: 302
  - url: http://www.semgroup.com/.well-known/security.txt
    status: 302
  - url: http://www.semgroup.com/openapi.json
    status: 302
  - url: http://www.semgroup.com/developers
    status: 503
  - url: https://www.semgroup.com/
    status: 0
  checked: '2026-09-04'
x-status: acquired
x-acquired-by: energy-transfer
x-parent: energy-transfer
x-acquired-date: 2019-12
x-status-source: https://energytransferpartners.gcs-web.com/news-releases/news-release-details/energy-transfer-and-semgroup-announce-successful-completion
x-status-evidence: Energy Transfer completed its acquisition of SemGroup on 2019-12-05; semgroup.com no longer resolves (roadmap#812)

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get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
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