FOMO

Fomo is the world’s first social proof marketing platform, helping brands increase conversions by showcasing real‑time customer activity. The service aggregates user actions such as purchases, sign‑ups, and reviews, and displays them as dynamic notifications on websites. By leveraging social proof, Fomo aims to boost trust, reduce cart abandonment, and drive higher sales for e‑commerce and SaaS businesses. The platform offers customizable widgets, analytics, and integrations with major marketing tools.

FOMO publishes 1 API contract indexed on the APIs.io network: Applications API. Tagged areas include Company, SocialProof, Marketing, SaaS, and ECommerce.

The FOMO catalog on APIs.io includes 1 Spectral governance ruleset.

FOMO’s developer surface includes support, signup flow, pricing, changelog, engineering blog, API reference, getting-started guide, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

38.7/100 thin Agent 22/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract

CompanySocialProofMarketingSaaSECommerce

Kin Score

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

Composite quality — 38.7/100 · thin

Contract Quality 10.4 / 21

Developer Ergonomics 7.3 / 17

Access Clarity 5.8 / 17

Operational Transparency 3.5 / 11

Contract Governance 1.9 / 10

Discoverability 4.1 / 9

Regulatory Posture 2.2 / 15

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 34.2 — up to +13.2 composite points
Contract Quality scores 49.0 — up to +12.8 composite points
Developer Ergonomics scores 42.9 — up to +11.4 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/usefomo/apis.yml: open an issue on github.com/api-evangelist/usefomo 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.

FOMO Applications API

The Applications API from FOMO — 6 operation(s) for applications.

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

FOMO API Rules

10 rules · 8 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

Usefomo Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Usefomo Agentic Access

8 operations · 5 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

SignUp

SignUp

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

ErrorCatalog

ErrorCatalog

Conformance

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

ChangeLog

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

Pricing

Pricing

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: usefomo
name: FOMO
image: https://s3.amazonaws.com/fomo-static-assets/og/fomo-social-proof-homepage-og.jpg
description: Fomo is the world’s first social proof marketing platform, helping brands increase conversions by showcasing
  real‑time customer activity. The service aggregates user actions such as purchases, sign‑ups, and reviews, and displays
  them as dynamic notifications on websites. By leveraging social proof, Fomo aims to boost trust, reduce cart abandonment,
  and drive higher sales for e‑commerce and SaaS businesses. The platform offers customizable widgets, analytics, and integrations
  with major marketing tools.
url: https://raw.githubusercontent.com/api-evangelist/usefomo/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-26 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-26'
modified: '2026-10-26'
tags:
- Company
- SocialProof
- Marketing
- SaaS
- ECommerce
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/usefomo-agentic-access.yml
- type: Spectral
  url: rules/usefomo-rules.yml
- type: ErrorCatalog
  url: errors/usefomo-problem-types.yml
- type: Conformance
  url: conformance/usefomo-conformance.yml
- type: LLMsTxt
  url: llms/usefomo-llms.txt
- type: Hosts
  url: hosts/usefomo-hosts.yml
- type: Vendors
  url: vendors/usefomo-vendors.yml
- type: SDKs
  url: packages/usefomo-packages.yml
- type: Packages
  url: packages/usefomo-packages.yml
- type: TermsOfService
  url: https://usefomo.com/terms
- type: Support
  url: http://help.usefomo.com
- type: StatusPage
  url: https://status.usefomo.com/
- type: SignUp
  url: https://usefomo.com/app/register
- type: Pricing
  url: https://usefomo.com/pricing
- type: ChangeLog
  url: https://usefomo.com/changelog
- type: Blog
  url: https://usefomo.com/blog/
- type: APIReference
  url: https://docs.usefomo.com/login?redirect_uri=/reference/welcome-to-fomo
- type: GettingStarted
  url: https://help.usefomo.com/category/13-getting-started
- type: Documentation
  url: https://docs.usefomo.com/
- type: DomainSecurity
  url: security/usefomo-domain-security.yml
- type: Website
  url: https://usefomo.com/
apis:
- aid: usefomo:usefomo-applications-api
  name: FOMO Applications API
  description: The Applications API from FOMO — 6 operation(s) for applications.
  tags:
  - Applications
  properties:
  - type: OpenAPI
    url: openapi/usefomo-applications-api-openapi.yml
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Documentation redirects to a JavaScript‑rendered portal with no machine‑readable spec.
  evidence:
  - url: https://usefomo.com/docs
    status: 302
  checked: '2026-10-26'
x-submission-probe: 200 2026-10-25
x-enrichment:
  date: '2026-10-26'
  status: enriched
  artifacts_added: 16
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

FOMO API — frequently asked questions

Does FOMO have an API?

Yes. APIs.io lists 1 API from FOMO, including FOMO Applications API.

Is there an OpenAPI specification for the FOMO API?

Yes. APIs.io indexes 1 OpenAPI specification for FOMO, each linked for download from this page.

Is the FOMO API ready for AI agents?

FOMO has a Kin Score of 38.7 out of 100 (thin) and an Agent Readiness score of 22.2 (agent-aware), scored by API Evangelist on 2026-10-31.

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