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 is listed with 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 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

11.6/100 emerging ▬ flat Agent 3/100 human only Front door AI 3/6 light Heartbeat 19/100 dormant saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

1 API

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

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 11.6/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.0 / 17

Access Clarity 2.5 / 17

Operational Transparency 1.0 / 11

Contract Governance 0.0 / 10

Discoverability 5.8 / 9

Regulatory Posture 1.3 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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

12 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 Ask about this →
Developer Ergonomics scores 11.9 — up to +17.6 composite points Ask about this →
Access Clarity scores 14.9 — up to +17.0 composite points Ask about this →

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.

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

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...

Stash API pricing

Not yet checked against Stash's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure.

Plan	Price
Stash Growth	$3.00
Stash+	$12.00

Plan details, limits and sources →

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

Compliance 1

Attestations the provider states (SOC 2, ISO 27001 and others), quoted from its own trust page. APIs.io verifies none of them.

Stash

1 quoted statement, read from Stash's own page on 2026-11-10.

COMPLIANCE

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 4

The organization behind the API

Website

Blog

EngineeringBlog

Press

Other 1

Properties that don't map to a standard resource type

Attestations

Attestations

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: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  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
- Portfolio-Management
created: '2026-06-13'
modified: '2026-09-16'
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: Website
  url: https://stash.com
- 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
- type: Attestations
  url: compliance/stash-compliance.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Stash API — frequently asked questions

Does Stash have an API?

Yes. APIs.io lists 1 API from Stash, including Stash Investing API.

How much does the Stash API cost?

APIs.io lists 2 pricing plans for Stash, with each plan's price, limits and inclusions under Pricing on this page.

Is the Stash API ready for AI agents?

Stash has a Kin Score of 11.6 out of 100 (emerging) and an Agent Readiness score of 2.5 (human-only), scored by API Evangelist on 2026-11-13.

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