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APIs.io Synthesis API

Decision-grade composites over the catalog — provider comparison, gap analysis, catalog change feed, and recommended-stack design. Pro.

APIs.io Synthesis API is one of 18 APIs that APIs.io publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

This API exposes 2 JSON Schema definitions.

Tagged areas include Synthesis. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, authentication docs, rate-limit docs, a changelog, and 2 JSON Schemas.

This API exposes 6 operations across 6 paths, and defines 1 schema. It is described by OpenAPI 3.2.0, at version 1.5.0.

Requests are made against a single base URL, https://apis.io/api/v1.

6 operations 6 paths 1 schemas 6 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.5.0
Base URL
https://apis.io/api/v1
Authentication
API Key
License
Resource Areas
1

Authentication & Security 1

APIs.io Synthesis API declares 1 security scheme for authenticating requests. An API key is passed in the header as X-API-Key (ApiKeyAuth).

  • ApiKeyAuth — Send a plan key to be served above the free tier. Keyless callers get the free tier; a call that needs a paid tier answers 402 rather than refusing the connect…

Paths & Operations 6

Across 6 paths, the API surfaces 6 operations — 6 GET. Each is listed below with its method, path, parameters, and response codes.

Synthesis 6

Decision-grade composites over the catalog — provider comparison, gap analysis, catalog change feed, and recommended-stack design. Pro.

GET
/compare
Compare providers side by side (Pro).
compareProviders 1 param → 200400402
GET
/gaps
Artifact + score gap analysis for a provider or stack (Pro).
gapAnalysis 2 params → 200400402
GET
/changes
What changed in the catalog since a date (Pro).
whatsChanged 2 params → 200400402
GET
/stack
Design a recommended API stack per capability.
recommendStack 2 params → 200400
GET
/gaps/industry/{slug}
Artifact gaps across a whole industry.
industryGapAnalysis 2 params → 200402404
GET
/stack/export
Export a designed stack as APIs.json.
exportStack 2 params → 200400402

Schemas 1

The contract defines 1 schema that model the data the API accepts and returns. The most detailed is Problem (6 properties). Each schema is shown below with its type and property counts.

Problem
object
A Problem Details object per [RFC 9457](https://www.rfc-editor.org/rfc/rfc9457). Served as application/problem+json. Extension members (e.g. parameter) may be…
6 properties 3 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

apis-io-synthesis-api-openapi.yml Raw ↑

Other APIs APIs.io publishes across the network.

APIs.io Submit API
APIs.io APIs API
APIs.io Areas API
APIs.io Artifact Types API
APIs.io Industries API
APIs.io Insights API
APIs.io Providers API
APIs.io Ratings API
APIs.io Regions API
APIs.io Search API
APIs.io Tags API
APIs.io Cohorts API
Where this information came from

This is an independent, third-party profile of APIs.io Synthesis API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

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