01 Advisors website screenshot

01 Advisors

01 Advisors (01A) is an early-growth venture capital and advisory firm founded in 2018 by former Twitter CEO Dick Costolo and former Twitter COO Adam Bain, with former Facebook Chief Revenue Officer David Fischer as a third general partner. Headquartered in San Francisco with a New York office, the firm positions itself as "venture coaches" that deliberately avoid taking board seats, focusing on Series B companies with product-market fit that need help building professional sales organizations and revenue operations. It manages roughly $920M across multiple funds. Added to the API Evangelist network as a venture-capital portfolio lead surfaced via foundry-group; the firm runs a corporate marketing website (Squarespace) and publishes no public API, developer portal, or machine-readable surface.

01 Advisors is profiled on the APIs.io network. Tagged areas include Company, Venture Capital, Venture Firm, Investor, and Startups.

🌐 Visit website 📡 Source on GitHub
6.8/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs
CompanyVenture CapitalVenture FirmInvestorStartupsSeries BSan FranciscoNew YorkAdvisory

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 6.8/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 0.0 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/01-advisors: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 1

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

01 Advisors Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Company 3

The organization behind the API

Website
Website
 About
About
 Careers
Careers

Other 1

Properties that don't map to a standard resource type

Portfolio
Portfolio

Source (apis.yml)

apis.yml Raw ↑ 
aid: 01-advisors
name: 01 Advisors
description: 01 Advisors (01A) is an early-growth venture capital and advisory firm founded in 2018 by former Twitter CEO
  Dick Costolo and former Twitter COO Adam Bain, with former Facebook Chief Revenue Officer David Fischer as a third general
  partner. Headquartered in San Francisco with a New York office, the firm positions itself as "venture coaches" that deliberately
  avoid taking board seats, focusing on Series B companies with product-market fit that need help building professional sales
  organizations and revenue operations. It manages roughly $920M across multiple funds. Added to the API Evangelist network
  as a venture-capital portfolio lead surfaced via foundry-group; the firm runs a corporate marketing website (Squarespace)
  and publishes no public API, developer portal, or machine-readable surface.
url: https://raw.githubusercontent.com/api-evangelist/01-advisors/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- foundry-group
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-17'
image: https://static1.squarespace.com/static/5d7687bc1df12933dc7edbc6/t/6601aefcde16691387cd6fa3/1765839789329/01A_Main_Logo_Black.png?format=1500w
tags:
- Company
- Venture Capital
- Venture Firm
- Investor
- Startups
- Series B
- San Francisco
- New York
- Advisory
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/01-advisors-domain-security.yml
- type: Website
  url: https://01a.com
- type: About
  url: https://01a.com/about
- type: Portfolio
  url: https://01a.com/featured
- type: Careers
  url: https://jobs.01a.com
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence