Sidecar

Sidecar (side.cr) was added to the API Evangelist network as a Union Square Ventures portfolio lead. The side.cr domain today hosts a transportation news and information content platform (self-described as "building the largest transportation news source powered by everyday people"), covering ridesharing, driving, delivery, safety, and automotive topics for riders and drivers. It is a reader-facing editorial site, not a developer platform: as of this enrichment pass it publishes no API, developer portal, documentation, SDKs, OpenAPI, or any /.well-known discovery surface. The name echoes the pioneering peer-to-peer Sidecar ridesharing company that Union Square Ventures backed and that wound down in 2015, but the current content site states no operational or corporate ties to that defunct service. This profile is retained as a company/lead record with no active API surface to enrich.

Sidecar is profiled on the APIs.io network. Tagged areas include Company, Transportation, Ride Hailing, Mobility, and Automotive.

📡 Profile data on GitHub

0.0/100 minimal ▬ flat Agent 0/100 human only Front door AI 1/6 silent Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Transportation Ride Hailing Mobility Automotive Defunct

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 0.0/100 · 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 0.0 / 9

Regulatory Posture 0.9 / 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 Horizontal (data, software, accessibility, platform) 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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<a href="https://apis.io/providers/sidecar/"><img src="https://apis.io/badge/sidecar/card.svg" alt="Sidecar on APIs.io — Kin Score by API Evangelist"></a>

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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
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

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
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points

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.

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/sidecar/apis.yml: open an issue on github.com/api-evangelist/sidecar 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.

Sidecar Domain Security

TLSv1.3

SECURITY

Resources

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Source (apis.yml)

aid: sidecar
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
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/sidecar.png
name: Sidecar
description: 'Sidecar (side.cr) was added to the API Evangelist network as a Union Square Ventures portfolio lead. The side.cr
  domain today hosts a transportation news and information content platform (self-described as "building the largest transportation
  news source powered by everyday people"), covering ridesharing, driving, delivery, safety, and automotive topics for riders
  and drivers. It is a reader-facing editorial site, not a developer platform: as of this enrichment pass it publishes no
  API, developer portal, documentation, SDKs, OpenAPI, or any /.well-known discovery surface. The name echoes the pioneering
  peer-to-peer Sidecar ridesharing company that Union Square Ventures backed and that wound down in 2015, but the current
  content site states no operational or corporate ties to that defunct service. This profile is retained as a company/lead
  record with no active API surface to enrich.'
url: https://raw.githubusercontent.com/api-evangelist/sidecar/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- union-square-ventures
x-tier: stub
x-tier-reason: portfolio-lead
x-status: defunct
x-status-detail: Sidecar Technologies, the San Francisco peer-to-peer ridesharing company Union Square Ventures backed, announced
  on 2015-12-29 that it would stop its ride and delivery service, and General Motors bought its assets and intellectual property
  and hired about 20 of its staff on 2016-01-19. The side.cr domain now hosts an unrelated transportation news site with no
  stated tie to the company.
x-status-date: '2015-12-29'
x-status-source:
- https://en.wikipedia.org/wiki/Sidecar_(company)
- https://eu.detroitnews.com/story/business/autos/general-motors/2016/01/19/gm-buys-assets-ride-hailing-company-sidecar/78999136/
- https://sunilpaul.medium.com/why-we-sold-to-gm-83a29058af5a
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Transportation
- Ride Hailing
- Mobility
- Automotive
- Defunct
tags_raw:
- Company
- Transportation
- Ridesharing
- Mobility
- Automotive
- Defunct
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/sidecar-domain-security.yml
x-enrichment:
  date: '2026-07-21'
  status: minimal
  artifacts_added: 1
  pass: local-v1
x-tags-removed:
- News
- Content Platform

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