Capital.xyz

Capital.xyz (the company behind the former Party Round) is a startup banking and fundraising platform that helps founders raise, hold, spend, and send money in one place. Companies sign up to run fundraising rounds, receive a virtual Visa debit card once capital is raised, hold and move funds, and connect the account to fintech services such as Gusto. The product is built on embedded-finance rails (Unit, Plaid, Visa) and is a consumer/SMB-facing application; as of this enrichment pass Capital.xyz publishes no public developer program, API reference, OpenAPI, or docs portal. Added to the API Evangelist network as a portfolio company of a16z.

Capital.xyz is profiled on the APIs.io network. Tagged areas include Company, Fintech, Banking, Startups, and Fundraising.

🌐 Visit website 📡 Source on GitHub

0.7/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

0 APIs

Company Fintech Banking Startups Fundraising Embedded Finance Venture Capital

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 0.7/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.0 / 10

Discoverability 4.3 / 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

Regulatory Posture applies to this provider. Its tags matched the Banking & Open Finance 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.

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/.

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/capitalxyz: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Resources

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: capitalxyz
name: Capital.xyz
description: Capital.xyz (the company behind the former Party Round) is a startup banking and fundraising platform that helps
  founders raise, hold, spend, and send money in one place. Companies sign up to run fundraising rounds, receive a virtual
  Visa debit card once capital is raised, hold and move funds, and connect the account to fintech services such as Gusto.
  The product is built on embedded-finance rails (Unit, Plaid, Visa) and is a consumer/SMB-facing application; as of this
  enrichment pass Capital.xyz publishes no public developer program, API reference, OpenAPI, or docs portal. Added to the
  API Evangelist network as a portfolio company of a16z.
url: https://raw.githubusercontent.com/api-evangelist/capitalxyz/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
x-no-public-api: true
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://capital.xyz/img/common/app_icon.png
tags:
- Company
- Fintech
- Banking
- Startups
- Fundraising
- Embedded Finance
- Venture Capital
apis: []
common:
- type: Website
  url: https://capital.xyz
- type: GitHubOrganization
  url: https://github.com/capitalxyz
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence