Datacircle

Datacircle lists all the GTM APIs. Its MCP server is open to anyone, with no key: add api.datacircle.dev/mcp to Claude, ChatGPT or Cursor. It answers from the sheet. list_apis lists the GTM APIs on it, and search_plans finds their plans by API, provider or price. Each plan comes with its score, and the best come first, as on the sheet.

Datacircle publishes 1 API contract indexed on the APIs.io network. Tagged areas include Company, B2B Data, and MCP.

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

Datacircle’s developer surface includes documentation, support, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.2/100 thin ▬ flat Agent 35/100 agent ready Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-01 · rubric v0.26.0 · Show this score on your site →

1 published contract 1 MCP Servers

Company B2B Data MCP

Kin Score

Kin Score How this is scored →
scored 2026-11-01 · rubric v0.26.0

Composite quality — 34.2/100 · thin

Contract Quality 3.9 / 19

Developer Ergonomics 2.1 / 15

Access Clarity 9.9 / 15

Operational Transparency 2.6 / 10

Contract Governance 1.6 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.7 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 35/100 · agent ready

Machine-Readable Contract 0 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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
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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

6 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 20.7 — up to +19.8 composite points
Developer Ergonomics scores 14.3 — up to +17.1 composite points
Contract Governance scores 18.2 — up to +9.8 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/datacircle/apis.yml: open an issue on github.com/api-evangelist/datacircle 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 3

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

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

Datacircle MCP Server

Remote Streamable HTTP MCP server, open with no key, answering from the Datacircle sheet of GTM APIs: list_apis lists the GTM APIs on it, and search_plans finds their plans by A...

MCP Servers 1

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

Datacircle MCP Server

Remote MCP server at api.datacircle.dev over streamable HTTP; 2 tools listed.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Datacircle Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Datacircle Rate Limits

1 limits

RATE LIMITS

Semantic Vocabularies 1

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

Datacircle Context

10 classes · 102 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Datacircle API Rules

12 rules · 10 errors 1 warnings 1 info

SPECTRAL

JSON Schema 5

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

Balance

5 properties

JSON SCHEMA

FetchinProfileResponse

67 properties

JSON SCHEMA

File

8 properties

JSON SCHEMA

HarvestApiProfileResponse

11 properties

JSON SCHEMA

Up2DataEnrichResponse

3 properties

JSON SCHEMA

Security Posture 2

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

Datacircle Authentication

http · 1 scheme

SECURITY

Datacircle Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Datacircle Agentic Access

8 operations · 3 acting · 1 human-in-the-loop

8 operations · 3 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

WellKnown

WellKnown

Build 1

SDKs, sample code, and the tooling you integrate with

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 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

LinkedIn

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: datacircle
name: Datacircle
image: https://datacircle.dev/og-datacircle-lists-all-the-gtm-apis.jpg
description: 'Datacircle lists all the GTM APIs. Its MCP server is open to anyone, with no key: add api.datacircle.dev/mcp
  to Claude, ChatGPT or Cursor. It answers from the sheet. list_apis lists the GTM APIs on it, and search_plans finds their
  plans by API, provider or price. Each plan comes with its score, and the best come first, as on the sheet.'
url: https://raw.githubusercontent.com/api-evangelist/datacircle/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-09 (local-v5; was harvest)
specificationVersion: '0.20'
created: '2026-10-09'
modified: '2026-10-21'
tags:
- Company
- B2B Data
- MCP
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: LLMsTxt
  url: llms/datacircle-llms.txt
- type: MCPServer
  url: mcp/datacircle-mcp.yml
- type: Documentation
  name: MCP server docs
  url: https://datacircle.dev/docs/mcp
- type: WellKnown
  url: well-known/datacircle-well-known.yml
- type: Hosts
  url: hosts/datacircle-hosts.yml
- type: Vendors
  url: vendors/datacircle-vendors.yml
- type: DomainSecurity
  url: security/datacircle-domain-security.yml
- type: Website
  url: https://datacircle.dev
- type: Documentation
  url: https://datacircle.dev/docs
- type: GitHubOrganization
  url: https://github.com/waynehamadi/datacircle
- type: Login
  url: https://datacircle.dev/login
- type: TermsOfService
  url: https://datacircle.dev/terms
- type: LinkedIn
  url: https://www.linkedin.com/company/datacircle-org
- type: X
  url: https://x.com/datacircle_dev
- type: PrivacyPolicy
  url: https://datacircle.dev/privacy
- type: Support
  url: https://datacircle.dev/support
apis:
- aid: datacircle:datacircle-mcp
  name: Datacircle MCP Server
  description: 'Remote Streamable HTTP MCP server, open with no key, answering from the Datacircle sheet of GTM APIs: list_apis
    lists the GTM APIs on it, and search_plans finds their plans by API, provider or price, each with its score.'
  humanURL: https://datacircle.dev/docs/mcp
  baseURL: https://api.datacircle.dev/mcp
  tags:
  - MCP
  properties:
  - type: MCPServer
    url: mcp/datacircle-mcp.yml
  - type: Documentation
    url: https://datacircle.dev/docs/mcp
x-submission-probe: docs OpenAPI 3.1 8 ops; invented path 404
x-submitted-by: wayne@datacircle.dev (email, 2026-10-09)
x-enrichment:
  date: '2026-10-09'
  status: enriched
  artifacts_added: 20
  pass: local-v5

Datacircle API — frequently asked questions

Does Datacircle have an API?

Yes. APIs.io lists 1 API from Datacircle, including Datacircle MCP Server.

How do I authenticate with the Datacircle API?

Datacircle documents its authentication (http · 1 scheme). The details are profiled on APIs.io as Datacircle Authentication.

How much does the Datacircle API cost?

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

Does Datacircle have an MCP server?

Yes. APIs.io lists 1 MCP server for Datacircle: Remote MCP server at api.datacircle.dev over streamable HTTP; 2 tools listed.

Is the Datacircle API ready for AI agents?

Datacircle has a Kin Score of 34.2 out of 100 (thin) and an Agent Readiness score of 34.5 (agent-ready), scored by API Evangelist on 2026-11-01.

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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Every operation they expose

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How their score was established

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