MainStreet

MainStreet is a private holding company that invests in durable businesses across key sectors such as software, AI, infrastructure, sports and entertainment, and finance. It acquires companies, provides operational support, and holds them for the long term, focusing on sustainable growth and reinvestment of profits. The firm emphasizes transparent offers, quick acquisition processes, and maintaining founder involvement, aiming to build lasting value for its portfolio companies.

MainStreet is profiled on the APIs.io network. Tagged areas include HoldingCompany, Investment, PrivateEquity, Portfolio, and Technology.

MainStreet’s developer surface includes engineering blog and 7 more developer resources.

🌐 Visit website📡 Profile data on GitHub
12.7/100 emerging Agent 6/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →
0 APIs 1 MCP Servers
HoldingCompanyInvestmentPrivateEquityPortfolioTechnology

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0
Composite quality — 12.7/100 · emerging
Contract Quality 0.0 / 21
Developer Ergonomics 2.0 / 17
Access Clarity 3.6 / 17
Operational Transparency 0.0 / 11
Contract Governance 0.0 / 10
Discoverability 4.1 / 9
Regulatory Posture 3.5 / 15
Agent readiness — 6/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 4 / 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
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/.
Show this score on your site. Kin Score badge preview for MainStreet It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/workonmainstreet-com/"><img src="https://apis.io/badge/workonmainstreet-com/card.svg" alt="MainStreet on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
Raise your score.
Agent readiness — checks not met, largest first (exact, from this profile):
  • Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
  • 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)
  • A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
10 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/workonmainstreet-com/apis.yml: open an issue on github.com/api-evangelist/workonmainstreet-com 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 →

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

MainStreet MCP Server

Remote MCP server at dashboard.mainstreet.com.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Workonmainstreet Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Workonmainstreet Com Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

Workonmainstreet Com Authentication

0 schemes

SECURITY

Workonmainstreet Com Domain Security

TLSv1.3 · HSTS

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Workonmainstreet Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy
 TermsOfService
TermsOfService

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Hosts
Hosts

Source (apis.yml)

apis.yml Raw ↑ 
aid: workonmainstreet-com
name: MainStreet
description: MainStreet is a private holding company that invests in durable businesses across key sectors such as software,
  AI, infrastructure, sports and entertainment, and finance. It acquires companies, provides operational support, and holds
  them for the long term, focusing on sustainable growth and reinvestment of profits. The firm emphasizes transparent offers,
  quick acquisition processes, and maintaining founder involvement, aiming to build lasting value for its portfolio companies.
image: https://mainstreet.com/opengraph.png
url: https://artifacts.apis.io/workonmainstreet-com/apis.yml
x-type: company
x-source: harvest:vc-portfolio
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-29 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-29'
modified: '2026-10-29'
tags:
- HoldingCompany
- Investment
- PrivateEquity
- Portfolio
- Technology
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: MCPServer
  url: mcp/workonmainstreet-com-mcp.yml
- type: Hosts
  url: hosts/workonmainstreet-com-hosts.yml
- type: DomainSecurity
  url: security/workonmainstreet-com-domain-security.yml
- type: Website
  url: https://workonmainstreet.com/
- type: Blog
  url: https://mainstreet.com/news
- type: PrivacyPolicy
  url: https://mainstreet.com/privacy-policy
- type: TermsOfService
  url: https://mainstreet.com/terms-of-service
- type: DeveloperPortal
  url: https://dashboard.mainstreet.com/
apis: []
x-backed-by:
- gradient-ventures
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: The provider's main site returns a JavaScript shell and the developer portal is a SPA, preventing machine-readable
    API discovery.
  evidence:
  - url: https://workonmainstreet.com/
    status: 200
  checked: '2026-10-29'
x-enrichment:
  date: '2026-10-29'
  status: enriched
  artifacts_added: 20
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

MainStreet API — frequently asked questions

How do I authenticate with the MainStreet API?

MainStreet documents its authentication (0 schemes). The details are profiled on APIs.io as Workonmainstreet Com Authentication.

Does MainStreet have an MCP server?

Yes. APIs.io lists 1 MCP server for MainStreet: Remote MCP server at dashboard.mainstreet.com.

Is the MainStreet API ready for AI agents?

MainStreet has a Kin Score of 12.7 out of 100 (emerging) and an Agent Readiness score of 6.3 (agent-aware), scored by API Evangelist on 2026-10-31.

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