Horizon Blockchain Games

Horizon Blockchain Games is the web3 gaming studio and infrastructure company behind Skyweaver and the Sequence platform (sequence.xyz / 0xsequence) — a modular, open-source web3 development stack for onchain apps, DeFi, stablecoins, and games. Sequence unifies smart-contract wallets, embedded Wallet-as-a-Service, 1-click cross-chain payments, an NFT marketplace, a multi-chain indexer, token metadata, a transaction relayer with gas sponsorship, a node gateway, analytics, and SDKs for Web, Unity, Unreal, React Native, and Go. Its APIs are webrpc JSON-RPC-over-HTTP services spanning 40+ EVM chains, authenticated with project access keys. Sequence was acquired by Polygon Labs. This profile was enriched by the API Evangelist pipeline from Sequence's public developer surface.

Horizon Blockchain Games publishes 7 APIs on the APIs.io network, including Sequence Indexer API, Sequence Metadata API, Sequence Marketplace API, and 4 more. Tagged areas include Company, Consumer, Blockchain, Web3, and Gaming.

The Horizon Blockchain Games catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Horizon Blockchain Games’ developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 24 more developer resources.

🌐 Visit website 📡 Source on GitHub
51.3/100 developing Agent 71/100 agent native Full breakdown ↓
scored 2026-07-20 · rubric v0.4
7 APIs 1 MCP Servers 0 Features
CompanyConsumerBlockchainWeb3GamingNFTWalletCryptocurrencySmart ContractsMarketplaceDeveloper ToolsEthereum

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 51.3/100 · developing
Contract Quality 9.4 / 25
Developer Ergonomics 16.1 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 6.8 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 71/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/horizon-blockchain-games: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs

Sequence Indexer API

Query native and token (ERC-20/721/1155) balances, supplies, transaction history, and orderbook data across 40+ EVM chains; manage webhook listeners for on-chain events.

Sequence Metadata API

Store, refresh, retrieve, and search ERC-721/ERC-1155 token metadata and collection/contract info for Ethereum-compatible chains.

Sequence Marketplace API

Read and manage listings, offers, currencies, and collectibles for NFT marketplaces per EVM chain via network-scoped hosts.

Sequence Transactions (Relayer) API

Submit and manage blockchain transactions with fee options, fee tokens, and gas sponsorship via per-chain relayer hosts.

Sequence Analytics API

Track compute usage, wallet totals, daily/monthly active wallets, retention, and marketplace metrics for a project (177 operations).

Sequence Builder API

Programmatically manage Sequence Builder projects: contracts, contract sources, audiences, and audience contacts.

Sequence API (Infrastructure)

Core infrastructure operations: signature validation (EIP-1271/typed-data), ETHAuth proofs, wallet linking, and swap price/quote lookups.

MCP Servers

horizon-blockchain-games-mcp.yml

MCP SERVER

Event Specifications

Horizon Blockchain Games Webhooks

ASYNCAPI

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LLMsTxt
LLMsTxt
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 Components
Components
 DataModel
DataModel
 Webhooks
Webhooks

Scroll for all 7

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 4

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 Deprecation
Deprecation
 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)

apis.yml Raw ↑ 
aid: horizon-blockchain-games
name: Horizon Blockchain Games
description: Horizon Blockchain Games is the web3 gaming studio and infrastructure company behind Skyweaver and the Sequence
  platform (sequence.xyz / 0xsequence) — a modular, open-source web3 development stack for onchain apps, DeFi, stablecoins,
  and games. Sequence unifies smart-contract wallets, embedded Wallet-as-a-Service, 1-click cross-chain payments, an NFT marketplace,
  a multi-chain indexer, token metadata, a transaction relayer with gas sponsorship, a node gateway, analytics, and SDKs for
  Web, Unity, Unreal, React Native, and Go. Its APIs are webrpc JSON-RPC-over-HTTP services spanning 40+ EVM chains, authenticated
  with project access keys. Sequence was acquired by Polygon Labs. This profile was enriched by the API Evangelist pipeline
  from Sequence's public developer surface.
url: https://raw.githubusercontent.com/api-evangelist/horizon-blockchain-games/refs/heads/main/apis.yml
image: https://sequence.xyz/favicon.ico
x-type: company
x-source: vc-portfolio
x-backed-by:
- initialized-capital
x-tier: active
x-tier-reason: enriched-provider
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Consumer
- Blockchain
- Web3
- Gaming
- NFT
- Wallet
- Cryptocurrency
- Smart Contracts
- Marketplace
- Developer Tools
- Ethereum
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Sequence Indexer API
  description: Query native and token (ERC-20/721/1155) balances, supplies, transaction history, and orderbook data across
    40+ EVM chains; manage webhook listeners for on-chain events.
  humanURL: https://docs.sequence.xyz/api-references/indexer/overview
  baseURL: https://mainnet-indexer.sequence.app
  properties:
  - type: OpenAPI
    url: openapi/horizon-blockchain-games-indexer-openapi-original.json
  - type: Overlay
    url: overlays/horizon-blockchain-games-indexer-overlay.yaml
- name: Sequence Metadata API
  description: Store, refresh, retrieve, and search ERC-721/ERC-1155 token metadata and collection/contract info for Ethereum-compatible
    chains.
  humanURL: https://docs.sequence.xyz/api-references/metadata/overview
  baseURL: https://metadata.sequence.app
  properties:
  - type: OpenAPI
    url: openapi/horizon-blockchain-games-metadata-openapi-original.json
  - type: Overlay
    url: overlays/horizon-blockchain-games-metadata-overlay.yaml
- name: Sequence Marketplace API
  description: Read and manage listings, offers, currencies, and collectibles for NFT marketplaces per EVM chain via network-scoped
    hosts.
  humanURL: https://docs.sequence.xyz/api-references/marketplace/overview
  baseURL: https://marketplace-api.sequence.app
  properties:
  - type: OpenAPI
    url: openapi/horizon-blockchain-games-marketplace-openapi-original.json
  - type: Overlay
    url: overlays/horizon-blockchain-games-marketplace-overlay.yaml
- name: Sequence Transactions (Relayer) API
  description: Submit and manage blockchain transactions with fee options, fee tokens, and gas sponsorship via per-chain relayer
    hosts.
  humanURL: https://docs.sequence.xyz/api-references/transactions/overview
  baseURL: https://mainnet-relayer.sequence.app
  properties:
  - type: OpenAPI
    url: openapi/horizon-blockchain-games-transactions-openapi-original.json
  - type: Overlay
    url: overlays/horizon-blockchain-games-transactions-overlay.yaml
- name: Sequence Analytics API
  description: Track compute usage, wallet totals, daily/monthly active wallets, retention, and marketplace metrics for a
    project (177 operations).
  humanURL: https://docs.sequence.xyz/api-references/analytics/overview
  baseURL: https://api.sequence.app
  properties:
  - type: OpenAPI
    url: openapi/horizon-blockchain-games-analytics-openapi-original.json
  - type: Overlay
    url: overlays/horizon-blockchain-games-analytics-overlay.yaml
- name: Sequence Builder API
  description: 'Programmatically manage Sequence Builder projects: contracts, contract sources, audiences, and audience contacts.'
  humanURL: https://docs.sequence.xyz/api-references/builder/overview
  baseURL: https://api.sequence.app
  properties:
  - type: OpenAPI
    url: openapi/horizon-blockchain-games-builder-openapi-original.json
  - type: Overlay
    url: overlays/horizon-blockchain-games-builder-overlay.yaml
- name: Sequence API (Infrastructure)
  description: 'Core infrastructure operations: signature validation (EIP-1271/typed-data), ETHAuth proofs, wallet linking,
    and swap price/quote lookups.'
  humanURL: https://docs.sequence.xyz/api-references/infrastructure/overview
  baseURL: https://api.sequence.app
  properties:
  - type: OpenAPI
    url: openapi/horizon-blockchain-games-infrastructure-openapi-original.json
  - type: Overlay
    url: overlays/horizon-blockchain-games-infrastructure-overlay.yaml
common:
- type: Website
  url: https://horizongames.net/
- type: DeveloperPortal
  url: https://sequence.build
- type: Documentation
  url: https://docs.sequence.xyz
- type: APIReference
  url: https://docs.sequence.xyz/api-references/overview
- type: GettingStarted
  url: https://docs.sequence.xyz/solutions/builder/getting-started
- type: Support
  url: https://support.sequence.xyz/en/
- type: Blog
  url: https://sequence.xyz/blog
- type: GitHubOrganization
  url: https://github.com/0xsequence
- type: Pricing
  url: https://sequence.xyz/pricing
- type: SignUp
  url: https://sequence.build
- type: TermsOfService
  url: https://sequence.xyz/terms
- type: PrivacyPolicy
  url: https://sequence.xyz/privacy
- type: StatusPage
  url: https://status.sequence.info
- type: Authentication
  url: authentication/horizon-blockchain-games-authentication.yml
- type: DomainSecurity
  url: security/horizon-blockchain-games-domain-security.yml
- type: AgenticAccess
  url: agentic-access/horizon-blockchain-games-agentic-access.yml
- type: Packages
  url: packages/horizon-blockchain-games-packages.yml
- type: SDKs
  url: packages/horizon-blockchain-games-packages.yml
- type: LLMsTxt
  url: llms/horizon-blockchain-games-llms.txt
- type: Conformance
  url: conformance/horizon-blockchain-games-conformance.yml
- type: ErrorCatalog
  url: errors/horizon-blockchain-games-error-codes.yml
- type: Lifecycle
  url: lifecycle/horizon-blockchain-games-lifecycle.yml
- type: Deprecation
  url: lifecycle/horizon-blockchain-games-lifecycle.yml
- type: Conventions
  url: conventions/horizon-blockchain-games-conventions.yml
- type: ChangeLog
  url: changelog/horizon-blockchain-games-changelog.yml
- type: Sandbox
  url: sandbox/horizon-blockchain-games-sandbox.yml
- type: Components
  url: components/horizon-blockchain-games-components.yml
- type: DataModel
  url: data-model/horizon-blockchain-games-data-model.yml
- type: MCPServer
  url: mcp/horizon-blockchain-games-mcp.yml
- type: Webhooks
  url: asyncapi/horizon-blockchain-games-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence