GatewayAPI

GatewayAPI provides a global messaging API platform offering SMS, RCS, and email services. It enables developers to send messages worldwide with advanced security, compliance, and EU data sovereignty options. The platform includes virtual numbers, shortcodes, keyword handling, number lookup, and detailed analytics, supporting multiple programming languages and integrations.

GatewayAPI is listed with 2 APIs on the APIs.io network, including REST API, and 1 more. Tagged areas include Company, Messaging, SMS, API, and Communications.

The GatewayAPI catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

GatewayAPI’s developer surface includes authentication, documentation, pricing, engineering blog, support, signup flow, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.1/100 thin Agent 15/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

2 APIs

Company Messaging SMSAPICommunications

Kin Score

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

Composite quality — 33.1/100 · thin

Contract Quality 5.4 / 21

Developer Ergonomics 7.7 / 17

Access Clarity 7.6 / 17

Operational Transparency 1.2 / 11

Contract Governance 2.2 / 10

Discoverability 4.9 / 9

Regulatory Posture 2.1 / 15

Agent readiness — 15/100 · agent aware

Machine-Readable Contract 18 / 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 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 0 / 3

Regulatory Posture applies to this provider. Its tags matched the Telecommunications 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/gatewayapi/"><img src="https://apis.io/badge/gatewayapi/card.svg" alt="GatewayAPI on APIs.io — Kin Score by API Evangelist"></a>

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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
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

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 25.5 — up to +18.6 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points
Access Clarity scores 44.7 — up to +11.1 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/gatewayapi/apis.yml: open an issue on github.com/api-evangelist/gatewayapi 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 2

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

GatewayAPI REST API

Read the complete documentation for our REST API, Email to/from SMS, Kannel API, SMPP and HLR-lookup.

GatewayAPI API

GatewayAPI API as documented publicly: 17 operations. Contract generated from the documentation by API Evangelist (2026-10-27); not the provider's own document.

Pricing Plans 1

Published pricing tiers and plan structures.

Gatewayapi Plans Pricing

2 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Gatewayapi Context

23 classes · 47 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

GatewayAPI API Rules

13 rules · 11 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

DeleteRestMtsmsIdIntResponse

8 properties

JSON SCHEMA

PostExampleCallbackRequest

11 properties

JSON SCHEMA

PostRestEmailRequest

10 properties

JSON SCHEMA

PostRestHlrResponse

10 properties

JSON SCHEMA

PostRestMtsmsRequest

7 properties

JSON SCHEMA

PostRestMtsmsResponse

8 properties

JSON SCHEMA

Security Posture 2

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

Gatewayapi Authentication

4 schemes

SECURITY

Gatewayapi Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

SecurityTxt

SecurityTxt

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: gatewayapi
name: GatewayAPI
image: https://gatewayapi.com/SoMe-Gatewayapi.jpg
description: GatewayAPI provides a global messaging API platform offering SMS, RCS, and email services. It enables developers
  to send messages worldwide with advanced security, compliance, and EU data sovereignty options. The platform includes virtual
  numbers, shortcodes, keyword handling, number lookup, and detailed analytics, supporting multiple programming languages
  and integrations.
url: https://raw.githubusercontent.com/api-evangelist/gatewayapi/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-27 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-26'
modified: '2026-10-26'
tags:
- Company
- Messaging
- SMS
- API
- Communications
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/gatewayapi-plans-pricing.yml
- type: Spectral
  url: rules/gatewayapi-rules.yml
- type: JSONLD
  url: json-ld/gatewayapi-context.jsonld
- type: Vocabulary
  url: vocabulary/gatewayapi-vocabulary.yml
- type: DataModel
  url: data-model/gatewayapi-data-model.yml
- type: Authentication
  url: authentication/gatewayapi-authentication.yml
- type: Conformance
  url: conformance/gatewayapi-conformance.yml
- type: LLMsTxt
  url: llms/gatewayapi-llms.txt
- type: SecurityTxt
  url: well-known/gatewayapi-status-security.txt
- type: WellKnown
  url: well-known/gatewayapi-well-known.yml
- type: Hosts
  url: hosts/gatewayapi-hosts.yml
- type: SDKs
  url: packages/gatewayapi-packages.yml
- type: Packages
  url: packages/gatewayapi-packages.yml
- type: DomainSecurity
  url: security/gatewayapi-domain-security.yml
- type: Website
  url: https://gatewayapi.com/
- type: Documentation
  url: https://gatewayapi.com/docs/
- type: DeveloperPortal
  url: https://gatewayapi.com/
- type: Pricing
  url: https://gatewayapi.com/pricing/
- type: Blog
  url: https://gatewayapi.com/blog/
- type: Support
  url: https://gatewayapi.com/help-center/introduction/
- type: SignUp
  url: https://gatewayapi.com/sign-up/
apis:
- name: GatewayAPI REST API
  description: Read the complete documentation for our REST API, Email to/from SMS, Kannel API, SMPP and HLR-lookup.
  humanURL: https://gatewayapi.com/docs/
  aid: gatewayapi:gatewayapi-rest-api
- aid: gatewayapi:gatewayapi-api
  name: GatewayAPI API
  description: 'GatewayAPI API as documented publicly: 17 operations. Contract generated from the documentation by API Evangelist
    (2026-10-27);

    not the provider''s own document.'
  humanURL: https://gatewayapi.com/docs/apis/rest
  baseURL: https://messaging.gatewayapi.com
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/gatewayapi-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/gatewayapi-post-rest-email-request-schema.json
  - type: JSONSchema
    url: json-schema/gatewayapi-post-example-callback-request-schema.json
  - type: JSONSchema
    url: json-schema/gatewayapi-post-rest-hlr-response-schema.json
  - type: JSONSchema
    url: json-schema/gatewayapi-post-rest-mtsms-request-schema.json
  - type: JSONSchema
    url: json-schema/gatewayapi-post-rest-mtsms-response-schema.json
  - type: JSONSchema
    url: json-schema/gatewayapi-delete-rest-mtsms-id-int-response-schema.json
x-submission-probe: 200 2026-10-25
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Documentation is served as a JavaScript‑rendered site with no machine‑readable OpenAPI spec.
  evidence:
  - url: https://gatewayapi.com/docs/
    status: 200
  checked: '2026-10-27'
x-enrichment:
  date: '2026-10-27'
  status: enriched
  artifacts_added: 25
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

GatewayAPI — frequently asked questions

Does GatewayAPI have an API?

Yes. APIs.io lists 2 APIs from GatewayAPI, including GatewayAPI REST API and GatewayAPI API.

Is there an OpenAPI specification for the GatewayAPI?

Yes. APIs.io indexes 2 OpenAPI specifications for GatewayAPI, each linked for download from this page.

How do I authenticate with the GatewayAPI?

GatewayAPI uses bearer-token authentication (4 schemes). The details are profiled on APIs.io as Gatewayapi Authentication.

How much does the GatewayAPI cost?

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

Is the GatewayAPI ready for AI agents?

GatewayAPI has a Kin Score of 33.1 out of 100 (thin) and an Agent Readiness score of 15.1 (agent-aware), scored by API Evangelist on 2026-10-31.

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