Ostium Labs

Ostium is a decentralized perpetual-futures exchange that lets traders access global real-world-asset markets — stocks, ETFs, commodities, indices, forex and crypto — directly from a self-custodial crypto wallet, with leverage and no broker or intermediary. Built on Arbitrum, the protocol pairs an on-chain OLP vault with an off-chain hedge that settle daily across three core participants. For developers, Ostium ships an official TypeScript Builder SDK (@ostium/builder-sdk) and a Python SDK (ostium-python-sdk) plus a public Builder API for live prices, OHLC candles and WebSocket price/account streaming, backed by a GraphQL subgraph. Client modes span read-only, trader-signed, and backend-controlled delegated / Safe-based gasless execution, with a testnet on Arbitrum Sepolia.

Ostium Labs is listed with 1 API on the APIs.io network: Ostium Builder API. Tagged areas include Company, Perpetual Futures, Decentralized Finance, DeFi, and Trading.

The Ostium Labs catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Ostium Labs’ developer surface includes documentation, API reference, getting-started guide, engineering blog, support, signup flow, pricing, and 27 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

48.6/100 developing ▬ flat Agent 20/100 agent aware Front door AI 1/6 silent Heartbeat 39/100 slowing saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API 3 Agent Skills

Company Perpetual Futures Decentralized Finance DeFi Trading Real World Assets Derivatives Arbitrum Blockchain Web3 Market Data SDK Real-Time

Kin Score

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

Composite quality — 48.6/100 · developing

Contract Quality 8.4 / 21

Developer Ergonomics 12.4 / 17

Access Clarity 8.9 / 17

Operational Transparency 3.2 / 11

Contract Governance 0.5 / 10

Discoverability 6.2 / 9

Regulatory Posture 5.0 / 15

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 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 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data 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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 39.6 — up to +15.1 composite points
Contract Governance scores 4.5 — up to +11.5 composite points
Access Clarity scores 52.6 — up to +9.5 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/ostium-labs/apis.yml: open an issue on github.com/api-evangelist/ostium-labs 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Stablecoins and Tokenization (stablecoin issuers, tokenized assets)	undeclared	-	-	-
LF Decentralized Trust (Hyperledger) Members and Projects (enterprise blockchain, digital identity, CBDC)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

AsyncAPI

measured — observed by APIs.io (published)

APIs 1

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

Ostium Builder API

Public Builder API and TypeScript/Python SDK surface for reading Ostium market data (pairs, prices, OHLC candles), streaming live prices and account/position updates over WebSoc...

Agent Skills 3

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

Manage and close an Ostium position

AGENT SKILL

Open a leveraged trade on Ostium

AGENT SKILL

Read and stream Ostium market data

AGENT SKILL

Event Specifications 1

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

Ostium Builder API — Streaming

Generated by API Evangelist from Ostium's documented WebSocket streaming surface (Builder API WS /v1/prices/stream and the SDK streamPrices / streamAccountUpdates / streamPositi...

ASYNCAPI

Security Posture 4

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

Ostium Labs Authentication

wallet-signature/delegated-key/public-read · 3 schemes

SECURITY

Ostium Labs Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Ostium Labs Vulnerability Disclosure

contact published

SECURITY

Ostium Labs Trust Center

trust center published

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

SignUp

Sandbox

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

AsyncAPI

AsyncAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

DataModel

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 5

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

TrustCenter

TrustCenter

Operate 4

Status, limits, changes, and where to get help

Support

Discord

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

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: ostium-labs
name: Ostium Labs
description: Ostium is a decentralized perpetual-futures exchange that lets traders access global real-world-asset markets
  — stocks, ETFs, commodities, indices, forex and crypto — directly from a self-custodial crypto wallet, with leverage and
  no broker or intermediary. Built on Arbitrum, the protocol pairs an on-chain OLP vault with an off-chain hedge that settle
  daily across three core participants. For developers, Ostium ships an official TypeScript Builder SDK (@ostium/builder-sdk)
  and a Python SDK (ostium-python-sdk) plus a public Builder API for live prices, OHLC candles and WebSocket price/account
  streaming, backed by a GraphQL subgraph. Client modes span read-only, trader-signed, and backend-controlled delegated /
  Safe-based gasless execution, with a testnet on Arbitrum Sepolia.
url: https://raw.githubusercontent.com/api-evangelist/ostium-labs/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- general-catalyst
x-tier: stub
x-tier-reason: portfolio-lead
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
  - security
  - sandbox
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
image: https://www.ostium.com/favicon.ico
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
x-docs-hosting: vercel
tags:
- Company
- Perpetual Futures
- Decentralized Finance
- DeFi
- Trading
- Real World Assets
- Derivatives
- Arbitrum
- Blockchain
- Web3
- Market Data
- SDK
- Real-Time
apis:
- name: Ostium Builder API
  description: Public Builder API and TypeScript/Python SDK surface for reading Ostium market data (pairs, prices, OHLC candles),
    streaming live prices and account/position updates over WebSocket, and building/submitting trades on the Ostium perpetuals
    protocol via read-only, self-signed, delegated and Safe-based gasless client modes.
  humanURL: https://docs.ostium.com/developer/sdk/overview
  baseURL: https://builder.ostium.io
  tags:
  - Trading
  - Market Data
  - Streaming
  - Perpetual Futures
  - DeFi
  properties:
  - type: Documentation
    url: https://docs.ostium.com/developer/sdk/overview
  - type: APIReference
    url: https://docs.ostium.com/developer/builder-api/overview
  - type: GettingStarted
    url: https://docs.ostium.com/developer/traders/approvals-and-first-trade
  - type: Authentication
    url: authentication/ostium-labs-authentication.yml
  - type: ErrorCatalog
    url: errors/ostium-labs-error-codes.yml
  - type: Conventions
    url: conventions/ostium-labs-conventions.yml
  - type: Lifecycle
    url: lifecycle/ostium-labs-lifecycle.yml
  - type: ChangeLog
    url: changelog/ostium-labs-changelog.yml
  - type: Sandbox
    url: sandbox/ostium-labs-sandbox.yml
  - type: DataModel
    url: data-model/ostium-labs-data-model.yml
  - type: Conformance
    url: conformance/ostium-labs-conformance.yml
  - type: AsyncAPI
    url: asyncapi/ostium-labs-prices-asyncapi.yml
  - type: X-MCPServerCandidate
    url: mcp/ostium-labs-mcp.yml
    note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list
      derived from the published API contracts, not an existing server. The scorer already read the manifest and reported
      mcp_server correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
common:
- type: Website
  url: https://www.ostium.com
- type: DeveloperPortal
  url: https://docs.ostium.com/developer/sdk/overview
- type: Documentation
  url: https://docs.ostium.com
- type: APIReference
  url: https://docs.ostium.com/developer/builder-api/overview
- type: GettingStarted
  url: https://docs.ostium.com/developer/traders/approvals-and-first-trade
- type: Blog
  url: https://www.ostium.com/blog
- type: GitHubOrganization
  url: https://github.com/0xOstium
- type: Support
  url: https://docs.ostium.com/traders/community/support
- type: SignUp
  url: https://app.ostium.com
- type: Pricing
  url: https://docs.ostium.com/traders/reference/fees
- type: TermsOfService
  url: https://docs.ostium.com/legal/terms-of-use
- type: PrivacyPolicy
  url: https://docs.ostium.com/legal/privacy-policy
- type: X
  url: https://x.com/ostium
- type: Discord
  url: https://discord.com/invite/ostiumlabs
- type: ChangeLog
  url: https://docs.ostium.com/developer/sdk/changelog
- type: LLMsTxt
  url: llms/ostium-labs-llms.txt
- type: Packages
  url: packages/ostium-labs-packages.yml
- type: SDKs
  url: packages/ostium-labs-packages.yml
- type: WellKnown
  url: well-known/ostium-labs-well-known.yml
- type: Authentication
  url: authentication/ostium-labs-authentication.yml
- type: Conventions
  url: conventions/ostium-labs-conventions.yml
- type: ErrorCatalog
  url: errors/ostium-labs-error-codes.yml
- type: Lifecycle
  url: lifecycle/ostium-labs-lifecycle.yml
- type: ChangeLog
  url: changelog/ostium-labs-changelog.yml
- type: Sandbox
  url: sandbox/ostium-labs-sandbox.yml
- type: DataModel
  url: data-model/ostium-labs-data-model.yml
- type: Conformance
  url: conformance/ostium-labs-conformance.yml
- type: DomainSecurity
  url: security/ostium-labs-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/ostium-labs-vulnerability-disclosure.yml
- type: Security
  url: https://immunefi.com/bug-bounty/ostium/
- type: TrustCenter
  url: security/ostium-labs-trust-center.yml
- type: AsyncAPI
  url: asyncapi/ostium-labs-prices-asyncapi.yml
- type: X-MCPServerCandidate
  url: mcp/ostium-labs-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 18
  pass: local-v1

Ostium Labs API — frequently asked questions

Does Ostium Labs have an API?

Yes. APIs.io lists 1 API from Ostium Labs, including Ostium Builder API.

How do I authenticate with the Ostium Labs API?

Ostium Labs uses bearer-token authentication (wallet-signature/delegated-key/public-read · 3 schemes). The details are profiled on APIs.io as Ostium Labs Authentication.

Is the Ostium Labs API ready for AI agents?

Ostium Labs has a Kin Score of 48.6 out of 100 (developing) and an Agent Readiness score of 20.3 (agent-aware), scored by API Evangelist on 2026-11-06.

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