Fulcra

Fulcra provides a user‑owned context backend for AI agents, enabling storage and retrieval of real‑world data, recorded knowledge, files, and agent work in a single, controllable context. It offers APIs for life data, MCP server, CLI tools, and SDKs, targeting developers building agent‑to‑agent communication and integration with popular AI models.

Fulcra publishes 11 API contracts indexed on the APIs.io network, including Annotations API, Calendars API, Data API, and 8 more. Tagged areas include Company, Artificial Intelligence, Context, Backend, and Agents.

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

Fulcra’s developer surface includes CLI, changelog, support, pricing, engineering blog, documentation, API reference, and 22 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

50.4/100 developing Agent 28/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 5 Agent Skills

Company Artificial Intelligence Context Backend Agents Platform

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 50.4/100 · developing

Contract Quality 13.5 / 21

Developer Ergonomics 7.6 / 17

Access Clarity 8.7 / 17

Operational Transparency 3.2 / 11

Contract Governance 2.2 / 10

Discoverability 6.7 / 9

Regulatory Posture 3.4 / 15

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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 5 / 5

Well-Known Catalog 4 / 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 0 / 5

Distinct Operations 0 / 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/.

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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 Ask about this →
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) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
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) Ask about this →

8 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 44.6 — up to +11.1 composite points Ask about this →
Access Clarity scores 51.1 — up to +9.8 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/fulcradynamics-com/apis.yml: open an issue on github.com/api-evangelist/fulcradynamics-com 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 1

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 11

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

Fulcra Annotations API

The annotations API from Fulcra — 5 operation(s) for annotations.

Fulcra Calendars API

The calendars API from Fulcra — 2 operation(s) for calendars.

Fulcra Data API

The data API from Fulcra — 31 operation(s) for data.

Fulcra Data Types API

The Data Types API from Fulcra — 3 operation(s) for data types.

Fulcra file uploads API

The file uploads API from Fulcra — 2 operation(s) for file uploads.

Fulcra Files API

The files API from Fulcra — 8 operation(s) for files.

Fulcra Ingest API

The ingest API from Fulcra — 2 operation(s) for ingest.

Fulcra Location API

The location API from Fulcra — 5 operation(s) for location.

Fulcra Sleep API

The sleep API from Fulcra — 5 operation(s) for sleep.

Fulcra Tags API

The tags API from Fulcra — 3 operation(s) for tags.

Fulcra User API

The user API from Fulcra — 2 operation(s) for user.

Scroll for all 11

Agent Skills 5

Packaged agent skills for driving this provider's APIs from an AI assistant.

fulcradynamics-com-create-and-download-file-upload-input

AGENT SKILL

fulcradynamics-com-create-and-retrieve-data-type

AGENT SKILL

fulcradynamics-com-create-retrieve-tags

AGENT SKILL

fulcradynamics-com-ingest-record

AGENT SKILL

fulcradynamics-com-manage-user-preferences

AGENT SKILL

Fulcra API pricing

Prices published by Fulcra, read 2026-11-09 from fulcradynamics.com/product/pricing.

Plan	Price
Free	$0
Pro	$14.99/month, or $149.99/year Save 17% yearly
Scale	Contact us

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Fulcra Plans Pricing

3 plans

PLANS

Semantic Vocabularies 1

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

Fulcradynamics Com Context

120 classes · 244 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Fulcra API Rules

57 rules · 45 error-severity 9 warn-severity 3 info-severity

SPECTRAL

JSON Schema 19

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

AnnotationRow

12 properties

JSON SCHEMA

BoundsResponse

2 properties

JSON SCHEMA

CreateDataTypeBody

12 properties

JSON SCHEMA

CreateFileUploadRequestBody

4 properties

JSON SCHEMA

CreateFileUploadResponseBody

2 properties

JSON SCHEMA

CreateFulcraTagRequest

1 properties

JSON SCHEMA

CustomFulcraDataType

15 properties

JSON SCHEMA

DataRecordV1

3 properties

JSON SCHEMA

DataTypeSpec

12 properties

JSON SCHEMA

FulcraAppleWorkout

12 properties

JSON SCHEMA

FulcraCalendarEvent

29 properties

JSON SCHEMA

FulcraCalendar

13 properties

JSON SCHEMA

FulcraFileUploadInput

16 properties

JSON SCHEMA

FulcraTag

2 properties

JSON SCHEMA

FulcraUserPreferences

9 properties

JSON SCHEMA

ListFileUploadResponseBody

2 properties

JSON SCHEMA

RecentChangesResponseBody

1 properties

JSON SCHEMA

UpdateDataTypeBody

5 properties

JSON SCHEMA

UploadResponse

1 properties

JSON SCHEMA

Scroll for all 19

Security Posture 2

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

Fulcra Authentication

http · 1 scheme

SECURITY

Fulcra Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Fulcra Agentic Access

67 operations · 17 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

CLI

CLI

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

Support

Support

ChangeLog

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 3

The organization behind the API

Newsroom

Newsroom

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: fulcradynamics-com
name: Fulcra
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://cdn.prod.website-files.com/660cca47b2504b903f5b91f0/6ae61956a754fc2eba2c7b17_fulcra-home-og-2026-10-31.png
description: Fulcra provides a user‑owned context backend for AI agents, enabling storage and retrieval of real‑world data,
  recorded knowledge, files, and agent work in a single, controllable context. It offers APIs for life data, MCP server, CLI
  tools, and SDKs, targeting developers building agent‑to‑agent communication and integration with popular AI models.
url: https://artifacts.apis.io/fulcradynamics-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-09 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-08'
modified: '2026-11-08'
tags:
- Company
- Artificial Intelligence
- Context
- Backend
- Agents
- Platform
tags_raw:
- Company
- AI
- Context
- Backend
- Agents
- Platform
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/fulcradynamics-com-agentic-access.yml
- type: Plans
  url: plans/fulcradynamics-com-plans-pricing.yml
- type: Spectral
  url: rules/fulcradynamics-com-rules.yml
- type: JSONLD
  url: json-ld/fulcradynamics-com-context.jsonld
- type: Vocabulary
  url: vocabulary/fulcradynamics-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/fulcradynamics-com-data-model.yml
- type: CLI
  url: cli/fulcradynamics-com-cli.yml
- type: ChangeLog
  url: changelog/fulcradynamics-com-changelog.yml
- type: ErrorCatalog
  url: errors/fulcradynamics-com-problem-types.yml
- type: Conformance
  url: conformance/fulcradynamics-com-conformance.yml
- type: LLMsTxt
  url: llms/fulcradynamics-com-llms.txt
- type: SecurityTxt
  url: well-known/fulcradynamics-com-support-security.txt
- type: WellKnown
  url: well-known/fulcradynamics-com-well-known.yml
- type: Hosts
  url: hosts/fulcradynamics-com-hosts.yml
- type: Vendors
  url: vendors/fulcradynamics-com-vendors.yml
- type: TermsOfService
  url: https://fulcradynamics.com/legal/terms-of-use
- type: Support
  url: https://support.fulcradynamics.com
- type: PrivacyPolicy
  url: https://fulcradynamics.com/legal/privacy-policy
- type: Pricing
  url: https://fulcradynamics.com/product/pricing
- type: Newsroom
  url: https://fulcradynamics.com/company/press
- type: GitHubOrganization
  url: https://github.com/fulcradynamics
- type: ChangeLog
  url: https://docs.fulcradynamics.com/changelog/
- type: Blog
  url: https://fulcradynamics.com/resources/blog
- type: Documentation
  url: https://docs.fulcradynamics.com/
- type: APIReference
  url: https://fulcradynamics.com/developers
- type: Authentication
  url: authentication/fulcradynamics-com-authentication.yml
- type: DomainSecurity
  url: security/fulcradynamics-com-domain-security.yml
- type: Website
  url: https://fulcradynamics.com/
apis:
- aid: fulcradynamics-com:fulcradynamics-com-annotations-api
  name: Fulcra Annotations API
  description: The annotations API from Fulcra — 5 operation(s) for annotations.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - Annotation
  tags_raw:
  - annotations
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-annotations-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-annotation-row-schema.json
- aid: fulcradynamics-com:fulcradynamics-com-calendars-api
  name: Fulcra Calendars API
  description: The calendars API from Fulcra — 2 operation(s) for calendars.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - Calendar
  tags_raw:
  - calendars
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-calendars-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-fulcra-calendar-event-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-fulcra-calendar-schema.json
- aid: fulcradynamics-com:fulcradynamics-com-data-api
  name: Fulcra Data API
  description: The data API from Fulcra — 31 operation(s) for data.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - Data
  tags_raw:
  - data
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-data-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-fulcra-calendar-event-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-custom-fulcra-data-type-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-fulcra-apple-workout-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-fulcra-calendar-schema.json
- aid: fulcradynamics-com:fulcradynamics-com-data-types-api
  name: Fulcra Data Types API
  description: The Data Types API from Fulcra — 3 operation(s) for data types.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - Data Types
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-data-types-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-data-type-spec-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-create-data-type-body-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-update-data-type-body-schema.json
- aid: fulcradynamics-com:fulcradynamics-com-file-uploads-api
  name: Fulcra file uploads API
  description: The file uploads API from Fulcra — 2 operation(s) for file uploads.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - File Uploads
  tags_raw:
  - file uploads
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-file-uploads-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-recent-changes-response-body-schema.json
- aid: fulcradynamics-com:fulcradynamics-com-files-api
  name: Fulcra Files API
  description: The files API from Fulcra — 8 operation(s) for files.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - File
  tags_raw:
  - files
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-files-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-fulcra-file-upload-input-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-create-file-upload-request-body-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-list-file-upload-response-body-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-create-file-upload-response-body-schema.json
- aid: fulcradynamics-com:fulcradynamics-com-ingest-api
  name: Fulcra Ingest API
  description: The ingest API from Fulcra — 2 operation(s) for ingest.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - Ingest
  tags_raw:
  - ingest
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-ingest-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-data-record-v1-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-upload-response-schema.json
- aid: fulcradynamics-com:fulcradynamics-com-location-api
  name: Fulcra Location API
  description: The location API from Fulcra — 5 operation(s) for location.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - Location
  tags_raw:
  - location
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-location-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-bounds-response-schema.json
- aid: fulcradynamics-com:fulcradynamics-com-sleep-api
  name: Fulcra Sleep API
  description: The sleep API from Fulcra — 5 operation(s) for sleep.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - Sleep
  tags_raw:
  - sleep
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-sleep-api-openapi.yml
- aid: fulcradynamics-com:fulcradynamics-com-tags-api
  name: Fulcra Tags API
  description: The tags API from Fulcra — 3 operation(s) for tags.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - Tags
  tags_raw:
  - tags
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-tags-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-fulcra-tag-schema.json
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-create-fulcra-tag-request-schema.json
- aid: fulcradynamics-com:fulcradynamics-com-user-api
  name: Fulcra User API
  description: The user API from Fulcra — 2 operation(s) for user.
  humanURL: https://docs.fulcradynamics.com/developer/
  baseURL: https://api.fulcradynamics.com
  tags:
  - User
  tags_raw:
  - user
  properties:
  - type: OpenAPI
    url: openapi/fulcradynamics-com-user-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fulcradynamics-com-fulcra-user-preferences-schema.json
x-enrichment:
  date: '2026-11-09'
  status: enriched
  artifacts_added: 35
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Fulcra API — frequently asked questions

Does Fulcra have an API?

Yes. APIs.io lists 11 APIs from Fulcra, including Fulcra Annotations API, Fulcra Calendars API and Fulcra Data API, and 8 more.

Is there an OpenAPI specification for the Fulcra API?

Yes. APIs.io indexes 11 OpenAPI specifications for Fulcra, each linked for download from this page.

How do I authenticate with the Fulcra API?

Fulcra uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Fulcra Authentication.

How much does the Fulcra API cost?

Fulcra publishes its prices; its Free plan is $0 as of 2026-11-09. APIs.io lists 3 pricing plans for Fulcra, with each plan's price, limits and inclusions under Pricing on this page.

Is the Fulcra API ready for AI agents?

Fulcra has a Kin Score of 50.4 out of 100 (developing) and an Agent Readiness score of 27.7 (agent-aware), scored by API Evangelist on 2026-11-13.

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