Sequence Markets

Sequence Markets is a Y Combinator (Winter 2026) trading operating system for institutional crypto that provides unified execution infrastructure across 12 fragmented digital-asset venues — centralized exchanges (Coinbase, Binance, Kraken, OKX, Bybit, Bitget, Crypto.com, Hyperliquid), DeFi, and prediction markets (Kalshi, Polymarket). It packages one market view into a single trade via a smart order router (SOR), execution graphs, and WASM-compiled algo strategies deployed to multi-region low-latency edges. Developers access it through a Bearer-auth REST API and multiplexed WebSocket streams, a Python SDK, a Rust SDK, an Algo SDK, a `sequence` CLI, and an MCP interface for human, algorithmic, and agent workflows, with a full paper-trading sandbox, smart order routing, and transaction-cost analytics (TCA).

Sequence Markets publishes 1 API on the APIs.io network. Tagged areas include Company, Trading, Cryptocurrency, Digital Assets, and Execution.

The Sequence Markets catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Sequence Markets’ developer surface includes documentation, API reference, getting-started guide, signup flow, authentication, CLI, sandbox, and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub

42.3/100 developing ▬ flat Agent 26/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Trading Cryptocurrency Digital Assets ExecutionSmart Order RoutingPrediction Markets Algorithmic Trading DeFi Market Data Fintech Developer Tools

Kin Score

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

Composite quality — 42.3/100 · developing

Contract Quality 8.8 / 21

Developer Ergonomics 12.4 / 17

Access Clarity 5.8 / 17

Operational Transparency 1.2 / 11

Contract Governance 0.5 / 10

Discoverability 6.5 / 9

Regulatory Posture 6.3 / 15

Agent readiness — 26/100 · 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 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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

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/.

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/sequence-markets: 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.

Sequence Markets Trading API

Bearer-auth REST API and multiplexed WebSocket streaming surface for the Sequence Markets trading OS — credentials & wallets, market data, orders & execution graphs, positions &...

Event Specifications 1

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

Sequence Markets Streaming API

Multiplexed WebSocket streaming surface for the Sequence Markets trading OS, generated faithfully from the documented channel catalog at docs.sequencemkts.com/api/streaming. Not...

ASYNCAPI

Security Posture 2

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

Sequence Markets Authentication

http-bearer · 1 scheme

SECURITY

Sequence Markets Domain Security

TLSv1.3 · HSTS · DMARC

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

X-MCPServerCandidate

LLMsTxt

WellKnown

AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

ErrorCatalog

Lifecycle

Conformance

DataModel

Webhooks

Scroll for all 7

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: sequence-markets
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: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/sequence-markets.png
name: Sequence Markets
description: Sequence Markets is a Y Combinator (Winter 2026) trading operating system for institutional crypto that provides
  unified execution infrastructure across 12 fragmented digital-asset venues — centralized exchanges (Coinbase, Binance, Kraken,
  OKX, Bybit, Bitget, Crypto.com, Hyperliquid), DeFi, and prediction markets (Kalshi, Polymarket). It packages one market
  view into a single trade via a smart order router (SOR), execution graphs, and WASM-compiled algo strategies deployed to
  multi-region low-latency edges. Developers access it through a Bearer-auth REST API and multiplexed WebSocket streams, a
  Python SDK, a Rust SDK, an Algo SDK, a `sequence` CLI, and an MCP interface for human, algorithmic, and agent workflows,
  with a full paper-trading sandbox, smart order routing, and transaction-cost analytics (TCA).
url: https://raw.githubusercontent.com/api-evangelist/sequence-markets/refs/heads/main/apis.yml
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
- Trading
- Cryptocurrency
- Digital Assets
- Execution
- Smart Order Routing
- Prediction Markets
- Algorithmic Trading
- DeFi
- Market Data
- Fintech
- Developer Tools
tags_raw:
- Company
- Trading
- Cryptocurrency
- Digital Assets
- Execution
- Smart Order Routing
- Prediction Markets
- Algorithmic Trading
- DeFi
- Market Data
- FinTech
- Developer Tools
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/sequence-markets-domain-security.yml
- type: Website
  url: https://sequencemkts.com/
- type: DeveloperPortal
  url: https://docs.sequencemkts.com/
- type: Documentation
  url: https://docs.sequencemkts.com/
- type: APIReference
  url: https://docs.sequencemkts.com/api/overview/
- type: GettingStarted
  url: https://docs.sequencemkts.com/quick-start/
- type: GitHubOrganization
  url: https://github.com/Bai-Funds
- type: TermsOfService
  url: https://sequencemkts.com/terms/
- type: PrivacyPolicy
  url: https://sequencemkts.com/privacy/
- type: SignUp
  url: https://sequencemkts.com/signup
- type: Authentication
  url: authentication/sequence-markets-authentication.yml
- type: Conventions
  url: conventions/sequence-markets-conventions.yml
- type: Idempotency
  url: conventions/sequence-markets-conventions.yml
- type: Packages
  url: packages/sequence-markets-packages.yml
- type: SDKs
  url: packages/sequence-markets-packages.yml
- type: CLI
  url: cli/sequence-markets-cli.yml
- type: Sandbox
  url: sandbox/sequence-markets-sandbox.yml
- type: RateLimits
  url: conventions/sequence-markets-conventions.yml
- type: ErrorCatalog
  url: errors/sequence-markets-problem-types.yml
- type: X-MCPServerCandidate
  url: mcp/sequence-markets-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: LLMsTxt
  url: llms/sequence-markets-llms.txt
- type: WellKnown
  url: well-known/sequence-markets-well-known.yml
- type: Lifecycle
  url: lifecycle/sequence-markets-lifecycle.yml
- type: Conformance
  url: conformance/sequence-markets-conformance.yml
- type: DataModel
  url: data-model/sequence-markets-data-model.yml
- type: AsyncAPI
  url: asyncapi/sequence-markets-streaming-asyncapi.yml
- type: Webhooks
  url: asyncapi/sequence-markets-streaming-asyncapi.yml
- type: AgentSkill
  url: skills/_index.yml
apis:
- name: Sequence Markets Trading API
  description: Bearer-auth REST API and multiplexed WebSocket streaming surface for the Sequence Markets trading OS — credentials
    & wallets, market data, orders & execution graphs, positions & balances, prediction markets, real-time streams, TCA &
    analytics, and algo management across 12 crypto venues.
  humanURL: https://docs.sequencemkts.com/api/overview/
  baseURL: https://api.sequencemkts.com
  tags:
  - Trading
  - Execution
  - Market Data
  - Cryptocurrency
  properties:
  - type: Documentation
    url: https://docs.sequencemkts.com/api/overview/
  - type: Authentication
    url: authentication/sequence-markets-authentication.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 18
  pass: local-v1

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