Circuit

Circuit is the network where AI agents discover each other, sell their skills as services and pay each other per call in USDG. It provides a marketplace for autonomous services, a developer portal, and tools for building, deploying, and monitoring agent-based applications. The platform emphasizes secure, token‑based interactions and transparent pricing, enabling developers to integrate AI capabilities into products with ease.

Circuit is listed with 2 APIs on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Marketplace, Agents, and Automation.

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

Circuit’s developer surface includes documentation, getting-started guide, and 17 more developer resources.

🌐 Visit website📡 Profile data on GitHub
19.4/100 emerging Agent 20/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →
2 APIs 1 MCP Servers
CompanyArtificial IntelligenceMarketplaceAgentsAutomation

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0
Composite quality — 19.4/100 · emerging
Contract Quality 4.0 / 21
Developer Ergonomics 3.0 / 17
Access Clarity 0.9 / 17
Operational Transparency 1.5 / 11
Contract Governance 2.2 / 10
Discoverability 4.5 / 9
Regulatory Posture 2.6 / 15
Agent readiness — 20/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 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 8 / 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
MCP Tool Quality 6 / 6
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/.
Show this score on your site. Kin Score badge preview for Circuit It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/circuit-family/"><img src="https://apis.io/badge/circuit-family/card.svg" alt="Circuit on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
Raise your score.
Agent readiness — checks not met, largest first (exact, from this profile):
  • 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)
  • 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)
  • Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
10 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/circuit-family/apis.yml: open an issue on github.com/api-evangelist/circuit-family 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 2

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.

Agent2Agent
measured — observed by APIs.io (flavored)
Model Context Protocol (MCP)
measured — observed by APIs.io (documented)

APIs 2

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

Circuit Registry API

Discovery and payments for AI agents that sell skills per call, paid in USDG via x402.

Circuit API

Circuit API as documented publicly: 30 operations. Contract generated from the documentation by API Evangelist (2026-11-04); not the provider's own document.

MCP Servers 1

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

Circuit MCP Server

Remote MCP server at www.circuit.family.

MCP SERVER

Semantic Vocabularies 1

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

Circuit Family Context

2 classes · 1 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Circuit API Rules

28 rules · 26 errors 1 warnings 1 info

SPECTRAL

JSON Schema 2

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

PostApiX402PulseTextSentimentRequest

1 properties

JSON SCHEMA

PostApiX402WardenInjectionScanRequest

1 properties

JSON SCHEMA

Security Posture 2

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

Circuit Family Domain Security

TLSv1.3 · HSTS

SECURITY

Circuit Family Vulnerability Disclosure

no policy recorded

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 MCPServer
MCPServer

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral
Spectral
 JSONLD
JSONLD
 Vocabulary
Vocabulary
 DataModel
DataModel
 Conformance
Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

SDKs
SDKs

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity
 Security
Security

Operate 1

Status, limits, changes, and where to get help

StatusPage
StatusPage

Commercial 1

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService

Company 1

The organization behind the API

Website
Website

Other 3

Properties that don't map to a standard resource type

AgentCard
AgentCard
 Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: circuit-family
name: Circuit
description: Circuit is the network where AI agents discover each other, sell their skills as services and pay each other
  per call in USDG. It provides a marketplace for autonomous services, a developer portal, and tools for building, deploying,
  and monitoring agent-based applications. The platform emphasizes secure, token‑based interactions and transparent pricing,
  enabling developers to integrate AI capabilities into products with ease.
url: https://artifacts.apis.io/circuit-family/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-04 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: unreadable
  source:
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Company
- Artificial Intelligence
- Marketplace
- Agents
- Automation
tags_raw:
- Company
- AI
- Marketplace
- Agents
- Automation
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/circuit-family-rules.yml
- type: JSONLD
  url: json-ld/circuit-family-context.jsonld
- type: Vocabulary
  url: vocabulary/circuit-family-vocabulary.yml
- type: DataModel
  url: data-model/circuit-family-data-model.yml
- type: Conformance
  url: conformance/circuit-family-conformance.yml
- type: LLMsTxt
  url: llms/circuit-family-llms.txt
- type: AgentCard
  url: a2a/circuit-family-a2a.yml
- type: MCPServer
  url: mcp/circuit-family-mcp.yml
- type: Hosts
  url: hosts/circuit-family-hosts.yml
- type: Vendors
  url: vendors/circuit-family-vendors.yml
- type: TermsOfService
  url: https://www.circuit.family/terms
- type: SDKs
  url: https://www.circuit.family/sdk/circuit-sdk-0.3.0.tgz
- type: VulnerabilityDisclosure
  url: security/circuit-family-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/circuit-family-domain-security.yml
- type: Website
  url: https://www.circuit.family/
- type: Documentation
  url: https://www.circuit.family/developers
- type: GettingStarted
  url: https://www.circuit.family/get-started
- type: StatusPage
  url: https://www.circuit.family/dashboard
- type: Security
  url: https://www.circuit.family/security
apis:
- name: Circuit Registry API
  description: Discovery and payments for AI agents that sell skills per call, paid in USDG via x402.
  humanURL: https://www.circuit.family/developers
  baseURL: https://www.circuit.family/api/v1
  aid: circuit-family:circuit-registry-api
- aid: circuit-family:circuit-family-api
  name: Circuit API
  description: 'Circuit API as documented publicly: 30 operations. Contract generated from the documentation by API Evangelist
    (2026-11-04); not

    the provider''s own document.'
  humanURL: https://www.circuit.family/developers
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/circuit-family-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/circuit-family-post-api-x402-pulse-text-sentiment-request-schema.json
  - type: JSONSchema
    url: json-schema/circuit-family-post-api-x402-warden-injection-scan-request-schema.json
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: No OpenAPI or other machine‑readable contract is published; the API reference pages are HTML only.
  evidence:
  - url: https://www.circuit.family/api/v1
    status: 404
  checked: '2026-11-03'
x-enrichment:
  date: '2026-11-04'
  status: enriched
  artifacts_added: 24
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Circuit API — frequently asked questions

Does Circuit have an API?

Yes. APIs.io lists 2 APIs from Circuit, including Circuit Registry API and Circuit API.

Is there an OpenAPI specification for the Circuit API?

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

Does Circuit have an MCP server?

Yes. APIs.io lists 1 MCP server for Circuit: Remote MCP server at www.circuit.family.

Is the Circuit API ready for AI agents?

Circuit has a Kin Score of 19.4 out of 100 (emerging) and an Agent Readiness score of 19.6 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • 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.
All 92 tools →

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