Overlay

Overlay is a decentralized perpetual-futures protocol on BNB Smart Chain (chain id 56) that lets anyone trade and permissionlessly create markets for emerging, pre-CEX, and narrative-driven assets against any verifiable data feed. Positions are synthetic — traders trade against a protocol-managed price feed with USDT/stablecoin collateral rather than an order book — with a dynamic risk engine managing thin markets and zero liquidity requirements. Overlay exposes a public, unauthenticated market-data API (aggregator contracts, contract specs, market catalog, charts price overview), a TypeScript SDK, a GraphQL subgraph, and a provider-published Agent Skill for automated trading. Backed by Polychain.

Overlay publishes 3 APIs on the APIs.io network: Aggregator API, Charts API, and Markets API. Tagged areas include Company, DeFi, Perpetual Futures, Derivatives, and Trading.

Overlay’s developer surface includes documentation, API reference, support, authentication, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub

31.3/100 thin ▬ flat Agent 25/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company DeFi Perpetual Futures Derivatives Trading Market Data BNB Smart Chain Blockchain Web3

Kin Score

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

Composite quality — 31.3/100 · thin

Contract Quality 10.6 / 21

Developer Ergonomics 9.7 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.5 / 10

Discoverability 6.5 / 9

Regulatory Posture 4.2 / 15

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 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 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 4 / 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/overlay: 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 3

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

Overlay Aggregator API

CoinGecko/CMC-style aggregator market-data feed.

Overlay Charts API

Price overview and OHLC chart data.

Overlay Markets API

Market catalog and metadata.

Open Collections 4

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Overlay Market Data Aggregator API

OPEN COLLECTION

Overlay Market Data Aggregator Charts API

OPEN COLLECTION

Overlay Market Data Aggregator Markets API

OPEN COLLECTION

Security Posture 2

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

Overlay Authentication

none · 1 scheme

SECURITY

Overlay Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

OpenAPI

OpenAPI

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

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 1

Status, limits, changes, and where to get help

Support

Support

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Whitepaper

Whitepaper

Overlay

Overlay

Source (apis.yml)

aid: overlay
name: Overlay
description: Overlay is a decentralized perpetual-futures protocol on BNB Smart Chain (chain id 56) that lets anyone trade
  and permissionlessly create markets for emerging, pre-CEX, and narrative-driven assets against any verifiable data feed.
  Positions are synthetic — traders trade against a protocol-managed price feed with USDT/stablecoin collateral rather than
  an order book — with a dynamic risk engine managing thin markets and zero liquidity requirements. Overlay exposes a public,
  unauthenticated market-data API (aggregator contracts, contract specs, market catalog, charts price overview), a TypeScript
  SDK, a GraphQL subgraph, and a provider-published Agent Skill for automated trading. Backed by Polychain.
url: https://raw.githubusercontent.com/api-evangelist/overlay/refs/heads/main/apis.yml
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://avatars.githubusercontent.com/u/70023182?v=4
x-type: company
x-source: vc-portfolio
x-backed-by:
- polychain
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- DeFi
- Perpetual Futures
- Derivatives
- Trading
- Market Data
- BNB Smart Chain
- Blockchain
- Web3
tags_raw:
- Company
- Defi
- DeFi
- Perpetual Futures
- Derivatives
- Trading
- Market Data
- BNB Smart Chain
- Blockchain
- Web3
apis:
- aid: overlay:overlay-aggregator-api
  name: Overlay Aggregator API
  description: CoinGecko/CMC-style aggregator market-data feed.
  humanURL: https://docs.overlay.market/api/aggregator-market-data
  baseURL: https://api.overlay.market
  tags:
  - Aggregator
  properties:
  - type: OpenAPI
    url: openapi/overlay-aggregator-api-openapi.yml
  - type: APIReference
    url: https://docs.overlay.market/api/aggregator-market-data
- aid: overlay:overlay-charts-api
  name: Overlay Charts API
  description: Price overview and OHLC chart data.
  humanURL: https://docs.overlay.market/api/aggregator-market-data
  baseURL: https://api.overlay.market
  tags:
  - Charts
  properties:
  - type: OpenAPI
    url: openapi/overlay-charts-api-openapi.yml
  - type: APIReference
    url: https://docs.overlay.market/api/aggregator-market-data
- aid: overlay:overlay-markets-api
  name: Overlay Markets API
  description: Market catalog and metadata.
  humanURL: https://docs.overlay.market/api/aggregator-market-data
  baseURL: https://api.overlay.market
  tags:
  - Markets
  properties:
  - type: OpenAPI
    url: openapi/overlay-markets-api-openapi.yml
  - type: APIReference
    url: https://docs.overlay.market/api/aggregator-market-data
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://overlay.market
- type: Documentation
  url: https://docs.overlay.market/
- type: DeveloperPortal
  url: https://docs.overlay.market/
- type: APIReference
  url: https://docs.overlay.market/api/aggregator-market-data
- type: GitHubOrganization
  url: https://github.com/overlay-market
- type: Support
  url: https://redrct.overlay.market/discord
- type: Whitepaper
  url: https://redrct.overlay.market/whitepaper
- type: OpenAPI
  url: openapi/_original/overlay-openapi.yml
- type: Authentication
  url: authentication/overlay-authentication.yml
- type: Conventions
  url: conventions/overlay-conventions.yml
- type: ErrorCatalog
  url: errors/overlay-problem-types.yml
- type: Lifecycle
  url: lifecycle/overlay-lifecycle.yml
- type: Conformance
  url: conformance/overlay-conformance.yml
- type: DataModel
  url: data-model/overlay-data-model.yml
- type: Overlay
  url: overlays/overlay-openapi-overlay.yaml
- type: LLMsTxt
  url: llms/overlay-llms.txt
- type: X-MCPServerCandidate
  url: mcp/overlay-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: Packages
  url: packages/overlay-packages.yml
- type: SDKs
  url: packages/overlay-packages.yml
- type: AgentSkill
  url: skills/overlay-market.md
- type: DomainSecurity
  url: security/overlay-domain-security.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 15
  pass: local-v1

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