FCS API

FCS API provides free and fast access to Forex, cryptocurrency, and stock market data through a simple REST and WebSocket API. It offers real-time and historical rates, technical indicators, and charting data for developers building trading, analytics, or financial applications. The service includes extensive documentation, pricing tiers, and a developer portal for easy integration.

FCS API is listed with 4 APIs on the APIs.io network, including Forex API, Raw API, Stock API, and 1 more. Tagged areas include Finance, Foreign Exchange, Cryptocurrency, Stocks, and Data API.

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

FCS API’s developer surface includes documentation, API reference, getting-started guide, pricing, engineering blog, support, and 15 more developer resources.

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31.2/100 thin ▼ -9.6 Agent 15/100 agent aware Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

4 APIs

Finance Foreign Exchange Cryptocurrency Stocks Data API

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 31.2/100 · thin

Contract Quality 4.6 / 19

Developer Ergonomics 3.4 / 15

Access Clarity 8.1 / 15

Operational Transparency 0.0 / 10

Contract Governance 2.0 / 9

Discoverability 5.9 / 8

Regulatory Posture 2.2 / 15

Create-or-Update Ergonomics 0.0 / 10

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 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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

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):

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
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
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

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 24.7 — up to +18.8 composite points
Developer Ergonomics scores 22.6 — up to +15.5 composite points
Operational Transparency scores 0.0 — up to +13.0 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/fcsapi/apis.yml: open an issue on github.com/api-evangelist/fcsapi 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 4

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

FCS API

Free and fast access to Forex, cryptocurrency, and stock market data via REST and WebSocket endpoints.

FCS API Forex API

The Forex API from FCS API — 3 operation(s) for forex.

FCS API Raw API

The Raw API from FCS API — 1 operation(s) for raw.

FCS API Stock API

The Stock API from FCS API — 6 operation(s) for stock.

FCS API pricing

Prices published by FCS API. A free plan or tier is listed.

Plan	Price
Free Plan	Free Plan
Forex Starter	Forex Starter
Enterprise	Enterprise
Professional Plan	Professional Plan
Corporate Plan	Corporate Plan

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Fcsapi Plans Pricing

5 plans

PLANS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

FCS API

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Fcsapi Finops

FINOPS

Semantic Vocabularies 1

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

Fcsapi Context

9 classes · 15 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

FCS API API Rules

12 rules · 8 errors 2 warnings 2 info

SPECTRAL

JSON Schema 6

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

GetForexJwtTokenResponse

4 properties

JSON SCHEMA

GetForexResponse

3 properties

JSON SCHEMA

GetStockForecastResponse

1 properties

JSON SCHEMA

GetStockResponse

5 properties

JSON SCHEMA

GetStockStockidResponse

1 properties

JSON SCHEMA

PostStockStockidResponse

3 properties

JSON SCHEMA

Security Posture 1

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

Fcsapi Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

Login

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Vendors

Vendors

Hosts

Hosts

Source (apis.yml)

aid: fcsapi
name: FCS API
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  probe_state: none
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://fcsapi.com/assets/images/home-top-bg.webp
description: FCS API provides free and fast access to Forex, cryptocurrency, and stock market data through a simple REST and
  WebSocket API. It offers real-time and historical rates, technical indicators, and charting data for developers building
  trading, analytics, or financial applications. The service includes extensive documentation, pricing tiers, and a developer
  portal for easy integration.
url: https://raw.githubusercontent.com/api-evangelist/fcsapi/refs/heads/main/apis.yml
x-type: company
x-source: harvest:g2-catalog
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-16 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-16'
modified: '2026-10-16'
tags:
- Finance
- Foreign Exchange
- Cryptocurrency
- Stocks
- Data API
tags_raw:
- Finance
- Forex
- Cryptocurrency
- Stocks
- DataAPI
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Vendors
  url: vendors/fcsapi-vendors.yml
- type: Plans
  url: plans/fcsapi-plans-pricing.yml
- type: Spectral
  url: rules/fcsapi-rules.yml
- type: JSONLD
  url: json-ld/fcsapi-context.jsonld
- type: Vocabulary
  url: vocabulary/fcsapi-vocabulary.yml
- type: DataModel
  url: data-model/fcsapi-data-model.yml
- type: Conformance
  url: conformance/fcsapi-conformance.yml
- type: LLMsTxt
  url: llms/fcsapi-llms.txt
- type: Hosts
  url: hosts/fcsapi-hosts.yml
- type: Login
  url: https://fcsapi.com/login
- type: DeveloperPortal
  url: https://developer.fcsapi.com/
- type: DomainSecurity
  url: security/fcsapi-domain-security.yml
- type: Website
  url: https://fcsapi.com/
- type: Documentation
  url: https://fcsapi.com/document/forex-api
- type: APIReference
  url: https://fcsapi.com/document/forex-api
- type: GettingStarted
  url: https://fcsapi.com/document/forex-api
- type: Pricing
  url: https://fcsapi.com/pricing
- type: TermsOfService
  url: https://fcsapi.com/terms
- type: PrivacyPolicy
  url: https://fcsapi.com/privacy-policy
- type: Blog
  url: https://fcsapi.com/blog
- type: Support
  url: https://fcsapi.com/contact-us
apis:
- name: FCS API
  description: Free and fast access to Forex, cryptocurrency, and stock market data via REST and WebSocket endpoints.
  humanURL: https://fcsapi.com/document/forex-api
  baseURL: https://api.fcsapi.com
  aid: fcsapi:fcs-api
- aid: fcsapi:fcsapi-forex-api
  name: FCS API Forex API
  description: The Forex API from FCS API — 3 operation(s) for forex.
  humanURL: https://fcsapi.com/document/forex-api
  baseURL: https://api.fcsapi.com
  tags:
  - Foreign Exchange
  tags_raw:
  - Forex
  properties:
  - type: OpenAPI
    url: openapi/fcsapi-forex-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fcsapi-get-forex-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-stock-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-post-stock-stockid-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-forex-jwt-token-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-stock-stockid-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-stock-forecast-response-schema.json
- aid: fcsapi:fcsapi-raw-api
  name: FCS API Raw API
  description: The Raw API from FCS API — 1 operation(s) for raw.
  humanURL: https://fcsapi.com/document/forex-api
  baseURL: https://api.fcsapi.com
  tags:
  - Raw
  properties:
  - type: OpenAPI
    url: openapi/fcsapi-raw-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fcsapi-get-forex-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-stock-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-post-stock-stockid-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-forex-jwt-token-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-stock-stockid-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-stock-forecast-response-schema.json
- aid: fcsapi:fcsapi-stock-api
  name: FCS API Stock API
  description: The Stock API from FCS API — 6 operation(s) for stock.
  humanURL: https://fcsapi.com/document/forex-api
  baseURL: https://api.fcsapi.com
  tags:
  - Stocks
  tags_raw:
  - Stock
  properties:
  - type: OpenAPI
    url: openapi/fcsapi-stock-api-openapi.yml
  - type: JSONSchema
    url: json-schema/fcsapi-get-forex-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-stock-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-post-stock-stockid-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-forex-jwt-token-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-stock-stockid-response-schema.json
  - type: JSONSchema
    url: json-schema/fcsapi-get-stock-forecast-response-schema.json
x-coverage:
  state: none
  reason: no-developer-program
  method: derived
  generated: '2026-10-16'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company publishes no developer documentation host and no machine-readable contract on its own domain
  evidence:
  - url: https://fcsapi.com/
    status: 200
x-enrichment:
  date: '2026-10-16'
  status: enriched
  artifacts_added: 20
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

FCS API — frequently asked questions

Does FCS API have an API?

Yes. APIs.io lists 4 APIs from FCS API, including FCS API, FCS API Forex API and FCS API Raw API, and 1 more.

Is there an OpenAPI specification for the FCS API?

Yes. APIs.io indexes 3 OpenAPI specifications for FCS API, each linked for download from this page.

How much does the FCS API cost?

FCS API publishes its prices; its Free Plan plan is Free Plan as of 2026-10-16. APIs.io lists 5 pricing plans for FCS API, with each plan's price, limits and inclusions under Pricing on this page.

Is the FCS API ready for AI agents?

FCS API has a Kin Score of 31.2 out of 100 (thin) and an Agent Readiness score of 15.1 (agent-aware), scored by API Evangelist on 2026-11-06.

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