onlinecompiler-io

OnlineCompiler.io provides a Code Execution API that allows developers to run and judge code in 46 programming languages via a simple HTTP interface. The service offers a free tier with up to 100,000 runs per month and commercial plans, supports sandboxed execution, and includes features like test case evaluation, language selection, and result metrics. It targets developers building online judges, coding education platforms, assessments, and AI agents.

onlinecompiler-io publishes 5 API contracts indexed on the APIs.io network, including Account API, Judge API, Reference API, and 2 more. Tagged areas include Company, CodeExecution, API, DeveloperTools, and Education.

The onlinecompiler-io catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

onlinecompiler-io’s developer surface includes authentication, API reference, and 20 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

68.0/100 exemplar Agent 60/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract

CompanyCodeExecutionAPIDeveloperToolsEducationAI

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 68.0/100 · exemplar

Contract Quality 13.9 / 21

Developer Ergonomics 8.8 / 17

Access Clarity 15.1 / 17

Operational Transparency 5.2 / 11

Contract Governance 8.1 / 10

Discoverability 5.6 / 9

Regulatory Posture 4.1 / 15

Agent readiness — 60/100 · agent ready

Machine-Readable Contract 18 / 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 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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 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

Regulatory Posture applies to this provider. Its tags matched the Education & Research 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):

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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter
Consent & Bot Identity +3 pts — common[].type includes AIPREF, ContentSignal, WebBotAuth, or HTTPMessageSignatures

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

Developer Ergonomics scores 51.7 — up to +9.7 composite points
Contract Quality scores 65.5 — up to +8.6 composite points
Operational Transparency scores 46.8 — up to +6.9 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/onlinecompiler-io/apis.yml: open an issue on github.com/api-evangelist/onlinecompiler-io 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 →

APIs 5

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

Code Execution API

Run and judge code in 46 languages via HTTP endpoints. Supports sync and async execution, test cases, and language selection.

onlinecompiler-io Account API

Usage and stored files of the calling key's account.

onlinecompiler-io Judge API

Run one program against many tests and score it.

onlinecompiler-io Reference API

Compilers, limits and health. No API key needed.

onlinecompiler-io Run API

Run one program.

Pricing Plans 1

Published pricing tiers and plan structures.

Onlinecompiler Io Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Onlinecompiler Io Rate Limits

4 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Onlinecompiler Io Webhooks

ASYNCAPI

Semantic Vocabularies 1

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

Onlinecompiler Io Context

20 classes · 64 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

onlinecompiler-io API Rules

13 rules · 11 errors 1 warnings 1 info

SPECTRAL

Security Posture 3

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

Onlinecompiler Io Authentication

1 scheme

SECURITY

Onlinecompiler Io Domain Security

TLSv1.3 · DMARC

SECURITY

Onlinecompiler Io Trust Center

SOC 2, ISO 27001

SECURITY

Agentic Access 1

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

Onlinecompiler Io Agentic Access

8 operations · 3 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

ErrorCatalog

Conformance

Scroll for all 7

Access & Security 5

Authentication, authorization, and security posture

Compliance

Authentication

Security

TrustCenter

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 1

Pricing, plans, and the legal terms of use

Plans

Plans

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: onlinecompiler-io
name: onlinecompiler-io
image: https://onlinecompiler.io/og.png
description: OnlineCompiler.io provides a Code Execution API that allows developers to run and judge code in 46 programming
  languages via a simple HTTP interface. The service offers a free tier with up to 100,000 runs per month and commercial plans,
  supports sandboxed execution, and includes features like test case evaluation, language selection, and result metrics. It
  targets developers building online judges, coding education platforms, assessments, and AI agents.
url: https://artifacts.apis.io/onlinecompiler-io/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- Company
- CodeExecution
- API
- DeveloperTools
- Education
- AI
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/onlinecompiler-io-agentic-access.yml
- type: RateLimits
  url: rate-limits/onlinecompiler-io-rate-limits.yml
- type: Plans
  url: plans/onlinecompiler-io-plans-pricing.yml
- type: Spectral
  url: rules/onlinecompiler-io-rules.yml
- type: JSONLD
  url: json-ld/onlinecompiler-io-context.jsonld
- type: Vocabulary
  url: vocabulary/onlinecompiler-io-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/onlinecompiler-io-webhooks.yml
- type: DataModel
  url: data-model/onlinecompiler-io-data-model.yml
- type: Compliance
  url: https://onlinecompiler.io/security
- type: Authentication
  url: authentication/onlinecompiler-io-authentication.yml
- type: ErrorCatalog
  url: errors/onlinecompiler-io-problem-types.yml
- type: Conformance
  url: conformance/onlinecompiler-io-conformance.yml
- type: LLMsTxt
  url: llms/onlinecompiler-io-llms.txt
- type: WellKnown
  url: well-known/onlinecompiler-io-well-known.yml
- type: Hosts
  url: hosts/onlinecompiler-io-hosts.yml
- type: Security
  url: https://onlinecompiler.io/security
- type: Login
  url: https://api.onlinecompiler.io/login/?next=/
- type: APIReference
  url: https://onlinecompiler.io/changelog
- type: TrustCenter
  url: security/onlinecompiler-io-trust-center.yml
- type: DomainSecurity
  url: security/onlinecompiler-io-domain-security.yml
- type: Website
  url: https://onlinecompiler.io/
apis:
- name: Code Execution API
  humanURL: https://onlinecompiler.io/docs
  baseURL: https://api.onlinecompiler.io
  description: Run and judge code in 46 languages via HTTP endpoints. Supports sync and async execution, test cases, and language
    selection.
  properties:
  - type: Documentation
    url: https://onlinecompiler.io/docs
  - type: APIReference
    url: https://api.onlinecompiler.io/openapi.json
  - type: GettingStarted
    url: https://onlinecompiler.io/docs/run-code
  - type: Pricing
    url: https://onlinecompiler.io/pricing
  - type: Support
    url: https://onlinecompiler.io/contact
  - type: PrivacyPolicy
    url: https://onlinecompiler.io/privacy
  - type: TermsOfService
    url: https://onlinecompiler.io/terms
  aid: onlinecompiler-io:code-execution-api
- aid: onlinecompiler-io:onlinecompiler-io-account-api
  name: onlinecompiler-io Account API
  description: Usage and stored files of the calling key's account.
  humanURL: https://onlinecompiler.io/docs
  baseURL: https://api.onlinecompiler.io
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/onlinecompiler-io-account-api-openapi.yml
- aid: onlinecompiler-io:onlinecompiler-io-judge-api
  name: onlinecompiler-io Judge API
  description: Run one program against many tests and score it.
  humanURL: https://onlinecompiler.io/docs
  baseURL: https://api.onlinecompiler.io
  tags:
  - Judge
  properties:
  - type: OpenAPI
    url: openapi/onlinecompiler-io-judge-api-openapi.yml
- aid: onlinecompiler-io:onlinecompiler-io-reference-api
  name: onlinecompiler-io Reference API
  description: Compilers, limits and health. No API key needed.
  humanURL: https://onlinecompiler.io/docs
  baseURL: https://api.onlinecompiler.io
  tags:
  - Reference
  properties:
  - type: OpenAPI
    url: openapi/onlinecompiler-io-reference-api-openapi.yml
- aid: onlinecompiler-io:onlinecompiler-io-run-api
  name: onlinecompiler-io Run API
  description: Run one program.
  humanURL: https://onlinecompiler.io/docs
  baseURL: https://api.onlinecompiler.io
  tags:
  - Run
  properties:
  - type: OpenAPI
    url: openapi/onlinecompiler-io-run-api-openapi.yml
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-10-31'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://onlinecompiler.io/openapi.json
    status: null
  - url: https://api.onlinecompiler.io/openapi.json
    status: null
  - url: https://api.onlinecompiler.io/mcp
    status: 401
  - url: https://onlinecompiler.io/
    status: 200
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 27
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

onlinecompiler-io API — frequently asked questions

Does onlinecompiler-io have an API?

Yes. APIs.io lists 5 APIs from onlinecompiler-io, including Code Execution API, onlinecompiler-io Account API and onlinecompiler-io Judge API, and 2 more.

Is there an OpenAPI specification for the onlinecompiler-io API?

Yes. APIs.io indexes 4 OpenAPI specifications for onlinecompiler-io, each linked for download from this page.

How do I authenticate with the onlinecompiler-io API?

onlinecompiler-io documents its authentication (1 scheme). The details are profiled on APIs.io as Onlinecompiler Io Authentication.

How much does the onlinecompiler-io API cost?

APIs.io lists 5 pricing plans for onlinecompiler-io, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the onlinecompiler-io API ready for AI agents?

onlinecompiler-io has a Kin Score of 68.0 out of 100 (exemplar) and an Agent Readiness score of 60.4 (agent-ready), scored by API Evangelist on 2026-10-31.

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