ByHeart

ByHeart is a US infant-nutrition company founded in 2016 that makes Whole Nutrition Infant Formula, marketed on the promise of better science, better ingredients, and better quality. It sells direct-to-consumer through a Shopify storefront at byheart.com as well as through retail. The company ran its own clinical program and built its own manufacturing. In November 2025 ByHeart recalled all batches after Clostridium botulinum contamination linked to infant-botulism cases and paused production pending FDA clearance to resume. ByHeart is a portfolio company of D1 Capital. It publishes no first-party developer API; its only machine-discoverable surface is the Shopify Customer Account API (OpenID Connect / OAuth 2.0) advertised under its domain.

ByHeart is profiled on the APIs.io network. Tagged areas include Company, Consumer, Infant Nutrition, Baby Formula, and Direct to Consumer.

ByHeart’s developer surface includes engineering blog, signup flow, support, authentication, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

20.7/100 emerging ▬ flat Agent 11/100 agent aware Front door AI 1/6 silent Heartbeat 95/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs 1 MCP Servers

Company Consumer Infant NutritionBaby FormulaDirect to Consumer E-Commerce Health Shopify

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 20.7/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 3.2 / 17

Access Clarity 5.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 4.1 / 9

Regulatory Posture 4.9 / 15

Agent readiness — 11/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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

Delegated User Identity 6 / 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 Health 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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<a href="https://apis.io/providers/byheart/"><img src="https://apis.io/badge/byheart/card.svg" alt="ByHeart on APIs.io — Kin Score by API Evangelist"></a>

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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
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

11 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
Developer Ergonomics scores 19.0 — up to +16.2 composite points
Access Clarity scores 34.2 — up to +13.2 composite points

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

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Universal Commerce Protocol (UCP)

measured — observed by APIs.io (shopify)

MCP Servers 1

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

ByHeart MCP Server

Remote MCP server at shopify.com over HTTP.

MCP SERVER

Security Posture 2

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

Byheart Authentication

oauth2/openIdConnect · 1 scheme

SECURITY

Byheart Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Byheart Scopes

4 scopes · authorizationCode

4 scopes

SCOPES

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

Login

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

MCPServer

MCPServer

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 1

Properties that don't map to a standard resource type

OpenIDConnect

OpenIDConnect

Source (apis.yml)

aid: byheart
name: ByHeart
description: ByHeart is a US infant-nutrition company founded in 2016 that makes Whole Nutrition Infant Formula, marketed
  on the promise of better science, better ingredients, and better quality. It sells direct-to-consumer through a Shopify
  storefront at byheart.com as well as through retail. The company ran its own clinical program and built its own manufacturing.
  In November 2025 ByHeart recalled all batches after Clostridium botulinum contamination linked to infant-botulism cases
  and paused production pending FDA clearance to resume. ByHeart is a portfolio company of D1 Capital. It publishes no first-party
  developer API; its only machine-discoverable surface is the Shopify Customer Account API (OpenID Connect / OAuth 2.0) advertised
  under its domain.
url: https://raw.githubusercontent.com/api-evangelist/byheart/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- d1-capital
x-tier: stub
x-tier-reason: portfolio-lead
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: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - scopes
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
image: https://www.byheart.com/favicon.ico
tags:
- Company
- Consumer
- Infant Nutrition
- Baby Formula
- Direct to Consumer
- E-Commerce
- Health
- Shopify
tags_raw:
- Company
- Consumer
- Infant Nutrition
- Baby Formula
- Direct-to-Consumer
- Ecommerce
- Health
- Shopify
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://byheart.com/pages/newsroom
  type: Blog
- type: Website
  url: https://www.byheart.com
- type: SignUp
  url: https://byheart.com/account/login
- type: Login
  url: https://byheart.com/account/login
- type: Support
  url: https://byheart.com/pages/byheart-faqs
- type: PrivacyPolicy
  url: https://byheart.com/pages/privacy-notice
- type: TermsOfService
  url: https://byheart.com/pages/terms-and-conditions
- type: WellKnown
  url: well-known/byheart-well-known.yml
- type: Authentication
  url: authentication/byheart-authentication.yml
- type: OpenIDConnect
  url: well-known/byheart-openid-configuration.json
- type: OAuthScopes
  url: scopes/byheart-scopes.yml
- type: Conformance
  url: conformance/byheart-conformance.yml
- type: MCPServer
  url: mcp/byheart-mcp.yml
- type: DomainSecurity
  url: security/byheart-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

ByHeart API — frequently asked questions

How do I authenticate with the ByHeart API?

ByHeart documents its authentication (oauth2/openIdConnect · 1 scheme). The details are profiled on APIs.io as Byheart Authentication.

Does ByHeart have an MCP server?

Yes. APIs.io lists 1 MCP server for ByHeart: Remote MCP server at shopify.com over HTTP.

Is the ByHeart API ready for AI agents?

ByHeart has a Kin Score of 20.7 out of 100 (emerging) and an Agent Readiness score of 10.8 (agent-aware), scored by API Evangelist on 2026-11-06.

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