Stash

Stash is an investing and banking app that enables fractional share investing, automated portfolio building, bank account management with a Stock-Back debit card, custodial accounts for minors, IRA retirement accounts, and financial education content. Stash serves over one million customers and has $4.3 billion under management, offering subscription-based access to a hybrid DIY and robo-advisor investing experience starting at $3 per month.

Stash publishes 1 API on the APIs.io network. Tagged areas include Fintech, Investing, Banking, Fractional Shares, and Portfolio-Management.

Stash’s developer surface includes status page, engineering blog, and 10 more developer resources.

📡 Source on GitHub

15.4/100 emerging ▬ flat Agent 3/100 human only saas Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

AccessPaid

1 APIs

Fintech Investing Banking Fractional Shares Portfolio-Management Financial Education Robo-AdvisorStock-BackCustodial Accounts IRA

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 15.4/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.0 / 17

Access Clarity 6.3 / 17

Operational Transparency 1.2 / 11

Contract Governance 0.0 / 10

Discoverability 5.8 / 9

Regulatory Posture 2.1 / 15

Agent readiness — 3/100 · 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 7 / 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

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.

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/.

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 github.com/api-evangelist/stash: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Stash Investing API

Stash provides a mobile-first investing and banking platform enabling fractional share purchases, automated smart portfolio management, retirement accounts, and a Stock-Back deb...

Pricing Plans 1

Published pricing tiers and plan structures.

Plans

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Finops

FINOPS

Security Posture 2

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

Stash Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Stash Trust Center

PCI DSS

SECURITY

Resources

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Security

Security

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Status

Status

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

Blog

Blog

EngineeringBlog

EngineeringBlog

Press

Press

Source (apis.yml)

aid: stash
name: Stash
description: Stash is an investing and banking app that enables fractional share investing, automated portfolio building,
  bank account management with a Stock-Back debit card, custodial accounts for minors, IRA retirement accounts, and financial
  education content. Stash serves over one million customers and has $4.3 billion under management, offering subscription-based
  access to a hybrid DIY and robo-advisor investing experience starting at $3 per month.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/stash.png
url: https://raw.githubusercontent.com/api-evangelist/stash/refs/heads/main/apis.yml
type: Index
tags:
- Fintech
- Investing
- Banking
- Fractional Shares
- Portfolio-Management
- Financial Education
- Robo-Advisor
- Stock-Back
- Custodial Accounts
- IRA
tags_raw:
- Fintech
- Investing
- Banking
- Fractional Shares
- Portfolio Management
- Financial Education
- Robo-Advisor
- Stock-Back
- Custodial Accounts
- IRA
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
apis:
- aid: stash:stash-investing-api
  name: Stash Investing API
  description: Stash provides a mobile-first investing and banking platform enabling fractional share purchases, automated
    smart portfolio management, retirement accounts, and a Stock-Back debit card. The platform is consumer-focused without
    a public developer API portal; programmatic access to Stash account data is available through Open Banking aggregators
    such as Plaid that support Stash connectivity.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.stash.com
  baseURL: https://api.stashinvest.com
  tags:
  - Investing
  - Banking
  - Fractional Shares
  - Portfolio
  - IRA
  - Custodial Accounts
  - Stock-Back
  properties:
  - type: Documentation
    url: https://www.stash.com/learn
  - type: TermsOfService
    url: https://www.stash.com/terms-of-service
  - type: PrivacyPolicy
    url: https://www.stash.com/privacy-policy
  - type: Security
    url: https://www.stashinvest.com/security
  - type: Status
    url: https://status.stash.com
  - type: Blog
    url: https://www.stash.com/learn
  - type: EngineeringBlog
    url: https://medium.com/stash-engineering
  - type: Press
    url: https://www.stash.com/press
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/stash/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/stash/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/stash/refs/heads/main/finops/finops.yml
  contact:
  - FN: Stash Support
    url: https://www.stash.com/support
    email:
    - email protected
common:
- type: TrustCenter
  url: security/stash-trust-center.yml
- type: DomainSecurity
  url: security/stash-domain-security.yml
- type: Plans
  url: https://raw.githubusercontent.com/api-evangelist/stash/refs/heads/main/plans/plans.yml
- type: RateLimits
  url: https://raw.githubusercontent.com/api-evangelist/stash/refs/heads/main/rate-limits/rate-limits.yml
- type: FinOps
  url: https://raw.githubusercontent.com/api-evangelist/stash/refs/heads/main/finops/finops.yml
- type: Status
  url: https://status.stash.com
- type: TermsOfService
  url: https://www.stash.com/terms-of-service
- type: PrivacyPolicy
  url: https://www.stash.com/privacy-policy
- type: Security
  url: https://www.stashinvest.com/security
- type: Blog
  url: https://www.stash.com/learn
- type: EngineeringBlog
  url: https://medium.com/stash-engineering
- type: Press
  url: https://www.stash.com/press
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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