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

The Overlay catalog on APIs.io includes 1 Spectral governance ruleset.

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

🌐 Visit website 📡 Profile data on GitHub

33.0/100 thin ▬ flat Agent 24/100 agent aware Front door AI 1/6 silent Heartbeat 60/100 slowing Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 1 Agent Skills

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

Kin Score

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

Composite quality — 33.0/100 · thin

Contract Quality 10.6 / 21

Developer Ergonomics 9.7 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.3 / 11

Contract Governance 1.9 / 10

Discoverability 6.2 / 9

Regulatory Posture 2.4 / 15

Agent readiness — 24/100 · 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

Pagination 0 / 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 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/.

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It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/overlay/"><img src="https://apis.io/badge/overlay/card.svg" alt="Overlay on APIs.io — Kin Score by API Evangelist"></a>

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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
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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

7 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Operational Transparency scores 2.6 — up to +12.7 composite points
Contract Quality scores 49.7 — up to +12.6 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/overlay/apis.yml: open an issue on github.com/api-evangelist/overlay 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
Agent Skills (SKILL.md packages)	undeclared	-	-	1

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 2

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.

Agent Skills

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

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 3

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

Overlay Market Data Aggregator API

OPEN COLLECTION

Overlay Market Data Aggregator Charts API

OPEN COLLECTION

Overlay Market Data Aggregator Markets API

OPEN COLLECTION

Agent Skills 1

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

overlay-market

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Overlay API Rules

40 rules · 38 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Overlay Openapi Overlay

2 actions · update · overlay-openapi.yml

DERIVED

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
  - security
  generated: '2026-11-06'
  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'
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
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

Overlay API — frequently asked questions

Does Overlay have an API?

Yes. APIs.io lists 3 APIs from Overlay, including Overlay Aggregator API, Overlay Charts API and Overlay Markets API.

Is there an OpenAPI specification for the Overlay API?

Yes. APIs.io indexes 3 OpenAPI specifications for Overlay, each linked for download from this page.

How do I authenticate with the Overlay API?

Overlay uses bearer-token authentication (none · 1 scheme). The details are profiled on APIs.io as Overlay Authentication.

Is the Overlay API ready for AI agents?

Overlay has a Kin Score of 33.0 out of 100 (thin) and an Agent Readiness score of 23.8 (agent-aware), scored by API Evangelist on 2026-11-06.

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