Runtime

Runtime (runtm.com) is a Y Combinator-backed platform (Spring 2026) that lets engineering and non-engineering teams safely run coding agents across an organization. It provides sandboxed per-session VMs, session-level observability, and configurable guardrails so teams can ship with agents like Claude Code, OpenAI Codex, and Gemini without breaking production. The hosted Runtime Cloud API (app.runtm.com/api/cloud) exposes sessions, templates, deployments, guardrails, secrets, knowledge and skill directives, and activity telemetry behind scoped bearer-token API keys, with a first-party CLI (runtm) and an agent-focused CLI (runtm-api).

Runtime publishes 1 API on the APIs.io network. Tagged areas include Company, Coding Agents, Developer Tools, AI Infrastructure, and Sandboxes.

Runtime’s developer surface includes documentation, API reference, getting-started guide, engineering blog, support, pricing, signup flow, and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub

33.8/100 thin ▬ flat Agent 15/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Coding Agents Developer Tools AI Infrastructure Sandboxes Agent Orchestration DevOps Cloud

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 33.8/100 · thin

Contract Quality 0.0 / 25

Developer Ergonomics 13.3 / 20

Access Clarity 6.3 / 20

Operational Transparency 6.5 / 13

Contract Governance 0.0 / 12

Discoverability 7.6 / 10

Agent readiness — 15/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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

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.

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 github.com/api-evangelist/runtime: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

Runtime Cloud API

The hosted Runtime Cloud API — manage sandboxed coding-agent sessions, org templates, deployments, guardrails, secrets, knowledge and skill directives, and activity telemetry. A...

Rate Limits 1

Documented rate limits and quota policies.

Runtime Rate Limits

2 limits

RATE LIMITS

Security Posture 3

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

Runtime Authentication

apiKey · 1 scheme

SECURITY

Runtime Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Runtime Vulnerability Disclosure

Hackerone · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Runtime Scopes

20 scopes

SCOPES

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

ErrorCatalog

Lifecycle

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

CLI

CLI

Access & Security 5

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

Operate 3

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

ChangeLog

ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: runtime
name: Runtime
description: Runtime (runtm.com) is a Y Combinator-backed platform (Spring 2026) that lets engineering and non-engineering
  teams safely run coding agents across an organization. It provides sandboxed per-session VMs, session-level observability,
  and configurable guardrails so teams can ship with agents like Claude Code, OpenAI Codex, and Gemini without breaking production.
  The hosted Runtime Cloud API (app.runtm.com/api/cloud) exposes sessions, templates, deployments, guardrails, secrets, knowledge
  and skill directives, and activity telemetry behind scoped bearer-token API keys, with a first-party CLI (runtm) and an
  agent-focused CLI (runtm-api).
url: https://raw.githubusercontent.com/api-evangelist/runtime/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-09-03'
  method: derived
image: https://runtm.com/og-image.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Coding Agents
- Developer Tools
- AI Infrastructure
- Sandboxes
- Agent Orchestration
- DevOps
- Cloud
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Runtime Cloud API
  description: The hosted Runtime Cloud API — manage sandboxed coding-agent sessions, org templates, deployments, guardrails,
    secrets, knowledge and skill directives, and activity telemetry. Authenticated with scoped bearer-token API keys (runtm_sk_
    prefix).
  humanURL: https://docs.runtm.com/cloud-api
  baseURL: https://app.runtm.com/api/cloud
  properties:
  - type: Documentation
    url: https://docs.runtm.com/cloud-api
  - type: Authentication
    url: authentication/runtime-authentication.yml
  - type: OAuthScopes
    url: scopes/runtime-scopes.yml
  - type: Conventions
    url: conventions/runtime-conventions.yml
  - type: Idempotency
    url: conventions/runtime-conventions.yml
  - type: ErrorCatalog
    url: errors/runtime-problem-types.yml
  - type: RateLimits
    url: rate-limits/runtime-rate-limits.yml
common:
- type: DomainSecurity
  url: security/runtime-domain-security.yml
- type: Website
  url: https://www.runtm.com/
- type: DeveloperPortal
  url: https://docs.runtm.com
- type: Documentation
  url: https://docs.runtm.com/cloud-api
- type: APIReference
  url: https://docs.runtm.com/cloud-api
- type: GettingStarted
  url: https://docs.runtm.com/quickstart
- type: Blog
  url: https://www.runtm.com/blog
- type: GitHubOrganization
  url: https://github.com/runtm-ai
- type: Support
  url: https://discord.gg/JUuCkUKc
- type: Pricing
  url: https://www.runtm.com/pricing
- type: SignUp
  url: https://app.runtm.com/login
- type: Login
  url: https://app.runtm.com/login
- type: TermsOfService
  url: https://www.runtm.com/terms
- type: PrivacyPolicy
  url: https://www.runtm.com/privacy
- type: LLMsTxt
  url: llms/runtime-llms.txt
- type: Authentication
  url: authentication/runtime-authentication.yml
- type: OAuthScopes
  url: scopes/runtime-scopes.yml
- type: Conventions
  url: conventions/runtime-conventions.yml
- type: Idempotency
  url: conventions/runtime-conventions.yml
- type: ErrorCatalog
  url: errors/runtime-problem-types.yml
- type: RateLimits
  url: rate-limits/runtime-rate-limits.yml
- type: Lifecycle
  url: lifecycle/runtime-lifecycle.yml
- type: ChangeLog
  url: changelog/runtime-changelog.yml
- type: Packages
  url: packages/runtime-packages.yml
- type: CLI
  url: cli/runtime-cli.yml
- type: AgentSkill
  url: skills/_index.yml
- type: VulnerabilityDisclosure
  url: security/runtime-vulnerability-disclosure.yml
- type: Security
  url: https://github.com/runtm-ai/runtm/blob/main/SECURITY.md
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 14
  pass: local-v1

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