Belly

Belly provides a customer loyalty and marketing automation platform for small and medium businesses. Founded in 2011, Belly offers a customizable loyalty program that integrates with point-of-sale systems, delivers analytics, and helps businesses engage customers through rewards, campaigns, and personalized experiences. The service is used by retailers, restaurants, and other consumer‑facing brands to build lasting relationships and gather actionable insights.

Belly is profiled on the APIs.io network. Tagged areas include Loyalty, Marketing, Small-Business, Retail, and SaaS.

Belly’s developer surface includes signup flow, pricing, engineering blog, support, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

23.2/100 emerging Agent 0/100 human only Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

0 APIs

Loyalty MarketingSmall-BusinessRetailSaaSCompany

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 23.2/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.4 / 17

Access Clarity 13.0 / 17

Operational Transparency 0.6 / 11

Contract Governance 0.0 / 10

Discoverability 3.9 / 9

Regulatory Posture 2.1 / 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

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

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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
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
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)
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

13 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 14.3 — up to +17.1 composite points
Operational Transparency scores 5.3 — up to +12.3 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/belly/apis.yml: open an issue on github.com/api-evangelist/belly 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 →

Pricing Plans 1

Published pricing tiers and plan structures.

Belly Plans Pricing

3 plans

PLANS

Security Posture 1

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

Belly Domain Security

TLSv1.3

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

PrivacyPolicy

Pricing

TermsOfService

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Leadership

Leadership

Source (apis.yml)

aid: belly
name: Belly
description: Belly provides a customer loyalty and marketing automation platform for small and medium businesses. Founded
  in 2011, Belly offers a customizable loyalty program that integrates with point-of-sale systems, delivers analytics, and
  helps businesses engage customers through rewards, campaigns, and personalized experiences. The service is used by retailers,
  restaurants, and other consumer‑facing brands to build lasting relationships and gather actionable insights.
url: https://raw.githubusercontent.com/api-evangelist/belly/refs/heads/main/apis.yml
x-type: company
x-source: harvest:vc-portfolio
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-26 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-25'
modified: '2026-10-25'
tags:
- Loyalty
- Marketing
- Small-Business
- Retail
- SaaS
- Company
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/belly-plans-pricing.yml
- type: Hosts
  url: hosts/belly-hosts.yml
- type: Vendors
  url: vendors/belly-vendors.yml
- type: SDKs
  url: packages/belly-packages.yml
- type: Packages
  url: packages/belly-packages.yml
- type: SignUp
  url: https://www.bellycard.com/get-sub/sign-up/
- type: PrivacyPolicy
  url: https://www.bellycard.com/privacy/
- type: Pricing
  url: https://www.bellycard.com/business/pricing/
- type: Leadership
  url: https://www.bellycard.com/about/team/
- type: Blog
  url: https://www.bellycard.com/resources/category/blog
- type: GitHubOrganization
  url: https://github.com/bellycard
- type: DomainSecurity
  url: security/belly-domain-security.yml
- type: Website
  url: https://www.bellycard.com
- type: Support
  url: https://www.bellycard.com/support
- type: TermsOfService
  url: https://www.bellycard.com/terms-policy
apis: []
x-backed-by:
- nea
x-coverage:
  state: none
  reason: no-developer-program
  method: derived
  generated: '2026-10-26'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company publishes no developer documentation host and no machine-readable contract on its own domain
  evidence:
  - url: https://api.bellycard.com/mcp
    status: 403
  - url: https://www.bellycard.com/mcp
    status: 403
  - url: https://www.bellycard.com
    status: null
x-enrichment:
  date: '2026-10-26'
  status: enriched
  artifacts_added: 10
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Belly API — frequently asked questions

How much does the Belly API cost?

APIs.io lists 3 pricing plans for Belly, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Belly API ready for AI agents?

Belly has a Kin Score of 23.2 out of 100 (emerging) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-10-31.

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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