Blue Square Group Limited

Blue Square Group Limited is the corporate entity behind GRVT (pronounced "gravity"), a licensed hybrid crypto derivatives exchange headquartered in Singapore and engineered by Gravity Technologies. GRVT pairs a high-performance central limit order book with self-custody settlement on a zkSync-based Layer 2, and exposes a public Market Data API and an authenticated Trading API over both REST and WebSocket. The APIs cover perpetual futures and spot trading, order management (including bulk orders, TP/SL and trigger orders), positions and margin, sub-account and funding-account summaries, transfers, deposits and withdrawals, and on-chain vault investment and redemption. Authentication combines an API-key login with Ethereum-style ECDSA (secp256k1 / EIP-712) request signing and scoped session keys. First-party Python and JavaScript/TypeScript SDKs plus published agent skills round out the developer surface. Surfaced as a portfolio company of 500 Global and enriched into the API Evangelist network.

Blue Square Group Limited publishes 1 API on the APIs.io network: GRVT Market Data API. Tagged areas include Company, Cryptocurrency, Derivatives Exchange, Trading, and Perpetual Futures.

The Blue Square Group Limited catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Blue Square Group Limited’s developer surface includes documentation, API reference, authentication, sandbox, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub

31.0/100 thin ▬ flat Agent 30/100 agent ready library Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

2 APIs

Company CryptocurrencyDerivatives ExchangeTrading Perpetual Futures Market Data Blockchain WebSocket Financial-Services

Kin Score

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

Composite quality — 31.0/100 · thin

Contract Quality 8.8 / 21

Developer Ergonomics 8.5 / 17

Access Clarity 0.0 / 17

Operational Transparency 1.7 / 11

Contract Governance 0.5 / 10

Discoverability 6.5 / 9

Regulatory Posture 5.7 / 15

Agent readiness — 30/100 · agent ready

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 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

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/blue-square-group-limited: 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 2

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

GRVT Market Data API

Public market-data API for GRVT — instruments, currencies, supported assets, margin rules, mini/full tickers, orderbook levels, trades, trade history, candlesticks, and funding ...

GRVT Trading API

Authenticated trading API for GRVT — create/cancel orders (single, bulk, TP/SL, trigger), open orders and order history, fills, positions and position history, margin management...

Event Specifications 1

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

Blue Square Group Limited Streams

ASYNCAPI

Security Posture 3

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

Blue Square Group Limited Authentication

apiKey/signature · 2 schemes

SECURITY

Blue Square Group Limited Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Blue Square Group Limited Vulnerability Disclosure

Bugcrowd · security.txt · contact published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

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

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

X-MCPServerCandidate

X-MCPServerCandidate

WellKnown

WellKnown

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

Conventions

Idempotency

DataModel

Webhooks

Conformance

Lifecycle

Scroll for all 7

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

DomainSecurity

DomainSecurity

Authentication

Authentication

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: blue-square-group-limited
name: Blue Square Group Limited
description: Blue Square Group Limited is the corporate entity behind GRVT (pronounced "gravity"), a licensed hybrid crypto
  derivatives exchange headquartered in Singapore and engineered by Gravity Technologies. GRVT pairs a high-performance central
  limit order book with self-custody settlement on a zkSync-based Layer 2, and exposes a public Market Data API and an authenticated
  Trading API over both REST and WebSocket. The APIs cover perpetual futures and spot trading, order management (including
  bulk orders, TP/SL and trigger orders), positions and margin, sub-account and funding-account summaries, transfers, deposits
  and withdrawals, and on-chain vault investment and redemption. Authentication combines an API-key login with Ethereum-style
  ECDSA (secp256k1 / EIP-712) request signing and scoped session keys. First-party Python and JavaScript/TypeScript SDKs plus
  published agent skills round out the developer surface. Surfaced as a portfolio company of 500 Global and enriched into
  the API Evangelist network.
deliveryModel:
  model: library
  open_source: false
  commercial: false
  callable_host: false
  label: Library · distributed through package registries, no callable service
  confidence: low
  source:
  - none
  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://avatars.githubusercontent.com/u/112316440?v=4
url: https://raw.githubusercontent.com/api-evangelist/blue-square-group-limited/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Cryptocurrency
- Derivatives Exchange
- Trading
- Perpetual Futures
- Market Data
- Blockchain
- WebSocket
- Financial-Services
tags_raw:
- Company
- Cryptocurrency
- Derivatives Exchange
- Trading
- Perpetual Futures
- Market Data
- Blockchain
- WebSocket
- Financial Services
apis:
- name: GRVT Market Data API
  description: Public market-data API for GRVT — instruments, currencies, supported assets, margin rules, mini/full tickers,
    orderbook levels, trades, trade history, candlesticks, and funding rates. No authentication required. Real-time equivalents
    are available over WebSocket streams.
  humanURL: https://api-docs.grvt.io/
  baseURL: https://market-data.grvt.io
  tags:
  - Market Data
  - Cryptocurrency
  - Trading
  properties:
  - type: AsyncAPI
    url: asyncapi/blue-square-group-limited-streams.yml
- name: GRVT Trading API
  description: Authenticated trading API for GRVT — create/cancel orders (single, bulk, TP/SL, trigger), open orders and order
    history, fills, positions and position history, margin management, sub-account and funding summaries, transfers/deposits/withdrawals,
    and vault invest/redeem. Requires API-key login plus ECDSA request signing.
  humanURL: https://api-docs.grvt.io/
  baseURL: https://trades.grvt.io
  tags:
  - Trading
  - Derivatives Exchange
  - Perpetual Futures
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/blue-square-group-limited-domain-security.yml
- type: Website
  url: https://grvt.io
- type: Documentation
  url: https://api-docs.grvt.io/
- type: APIReference
  url: https://api-docs.grvt.io/
- type: GitHubOrganization
  url: https://github.com/gravity-technologies
- type: LLMsTxt
  url: llms/blue-square-group-limited-llms.txt
- type: Packages
  url: packages/blue-square-group-limited-packages.yml
- type: SDKs
  url: packages/blue-square-group-limited-packages.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Authentication
  url: authentication/blue-square-group-limited-authentication.yml
- type: ErrorCatalog
  url: errors/blue-square-group-limited-problem-types.yml
- type: Conventions
  url: conventions/blue-square-group-limited-conventions.yml
- type: Idempotency
  url: conventions/blue-square-group-limited-conventions.yml
- type: DataModel
  url: data-model/blue-square-group-limited-data-model.yml
- type: Sandbox
  url: sandbox/blue-square-group-limited-sandbox.yml
- type: Webhooks
  url: asyncapi/blue-square-group-limited-streams.yml
- type: Conformance
  url: conformance/blue-square-group-limited-conformance.yml
- type: X-MCPServerCandidate
  url: mcp/blue-square-group-limited-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: Lifecycle
  url: lifecycle/blue-square-group-limited-lifecycle.yml
- type: WellKnown
  url: well-known/blue-square-group-limited-well-known.yml
- type: SecurityTxt
  url: well-known/blue-square-group-limited-security.txt
- type: VulnerabilityDisclosure
  url: security/blue-square-group-limited-vulnerability-disclosure.yml
- type: Security
  url: https://grvt.io/.well-known/security.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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