X2Y2 website screenshot

X2Y2

X2Y2 is an NFT marketplace and trading platform on Ethereum offering REST APIs for querying listings, offers, sales history, collection statistics, and executing NFT trades. It provides one of the lowest marketplace fees in the industry at 0.5% and includes an NFT-backed lending (Fi) API suite alongside its core marketplace API.

X2Y2 publishes 8 APIs on the APIs.io network, including Chain API, Contracts API, Events API, and 5 more. Tagged areas include NFT, Ethereum, Marketplace, Blockchain, and Web3.

The X2Y2 catalog on APIs.io includes 1 JSON-LD context.

X2Y2’s developer surface includes authentication, GitHub presence, documentation, API reference, and 4 more developer resources.

📡 Source on GitHub
28.1/100 thin ▬ flat Agent 22/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0
AccessSelf serve
8 APIs
NFTEthereumMarketplaceBlockchainWeb3CollectiblesTrading

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0
Composite quality — 28.1/100 · thin
Contract Quality 11.8 / 21
Developer Ergonomics 6.1 / 17
Access Clarity 0.0 / 17
Operational Transparency 0.6 / 11
Contract Governance 0.0 / 10
Discoverability 6.3 / 9
Regulatory Posture 4.2 / 15
Agent readiness — 22/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 6 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 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 Surface 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime (on an ambiguous tag, where no other regime matched), 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.
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/. This rating is computed from github.com/api-evangelist/x2y2: 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 8

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

X2Y2 Chain API

The Chain API from X2Y2 — 4 operation(s) for chain.

X2Y2 Contracts API

The Contracts API from X2Y2 — 2 operation(s) for contracts.

X2Y2 Events API

The Events API from X2Y2 — 1 operation(s) for events.

X2Y2 General API

The General API from X2Y2 — 1 operation(s) for general.

X2Y2 Loan API

The Loan API from X2Y2 — 1 operation(s) for loan.

X2Y2 Offer API

The Offer API from X2Y2 — 4 operation(s) for offer.

X2Y2 Offers API

The Offers API from X2Y2 — 1 operation(s) for offers.

X2Y2 Orders API

The Orders API from X2Y2 — 4 operation(s) for orders.

Scroll for all 8

Open Collections 9

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

API Collection

OPEN COLLECTION

X2Y2 Fi Chain API

OPEN COLLECTION

X2Y2 Fi Chain Contracts API

OPEN COLLECTION

X2Y2 Fi Chain Events API

OPEN COLLECTION

X2Y2 Fi Chain General API

OPEN COLLECTION

X2Y2 Fi Chain Loan API

OPEN COLLECTION

X2Y2 Fi Chain Offer API

OPEN COLLECTION

X2Y2 Fi Chain Offers API

OPEN COLLECTION

X2Y2 Fi Chain Orders API

OPEN COLLECTION

Scroll for all 9

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Apis Context

0 classes · 0 properties

JSON-LD

Security Posture 2

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

X2Y2 Authentication

apiKey · 3 schemes

SECURITY

X2Y2 Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

X2Y2 Agentic Access

18 operations · 9 acting

18 operations · 9 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 3

SDKs, sample code, and the tooling you integrate with

GitHub
GitHub
 SDKs
SDKs
 npm
npm

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Source (apis.yml)

apis.yml Raw ↑ 
name: X2Y2
description: X2Y2 is an NFT marketplace and trading platform on Ethereum offering REST APIs for querying listings, offers,
  sales history, collection statistics, and executing NFT trades. It provides one of the lowest marketplace fees in the industry
  at 0.5% and includes an NFT-backed lending (Fi) API suite alongside its core marketplace API.
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/x2y2.png
url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/apis.yml
created: '2024-01-01'
modified: '2026-06-14'
specificationVersion: '0.23'
tags:
- NFT
- Ethereum
- Marketplace
- Blockchain
- Web3
- Collectibles
- Trading
apis:
- aid: x2y2:x2y2-chain-api
  name: X2Y2 Chain API
  description: The Chain API from X2Y2 — 4 operation(s) for chain.
  humanURL: https://docs.x2y2.io/developers/api
  baseURL: https://api.x2y2.org
  tags:
  - Chain
  properties:
  - type: OpenAPI
    url: openapi/x2y2-chain-api-openapi.yml
  - type: Documentation
    url: https://docs.x2y2.io/developers/api
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/plans/plans.md
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/rate-limits/rate-limits.md
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/finops/finops.md
- aid: x2y2:x2y2-contracts-api
  name: X2Y2 Contracts API
  description: The Contracts API from X2Y2 — 2 operation(s) for contracts.
  humanURL: https://docs.x2y2.io/developers/api
  baseURL: https://api.x2y2.org
  tags:
  - Contracts
  properties:
  - type: OpenAPI
    url: openapi/x2y2-contracts-api-openapi.yml
  - type: Documentation
    url: https://docs.x2y2.io/developers/api
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/plans/plans.md
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/rate-limits/rate-limits.md
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/finops/finops.md
- aid: x2y2:x2y2-events-api
  name: X2Y2 Events API
  description: The Events API from X2Y2 — 1 operation(s) for events.
  humanURL: https://docs.x2y2.io/developers/api
  baseURL: https://api.x2y2.org
  tags:
  - Event
  tags_raw:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/x2y2-events-api-openapi.yml
  - type: Documentation
    url: https://docs.x2y2.io/developers/api
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/plans/plans.md
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/rate-limits/rate-limits.md
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/finops/finops.md
- aid: x2y2:x2y2-general-api
  name: X2Y2 General API
  description: The General API from X2Y2 — 1 operation(s) for general.
  humanURL: https://docs.x2y2.io/developers/api
  baseURL: https://api.x2y2.org
  tags: []
  tags_raw:
  - General
  properties:
  - type: OpenAPI
    url: openapi/x2y2-general-api-openapi.yml
  - type: Documentation
    url: https://docs.x2y2.io/developers/api
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/plans/plans.md
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/rate-limits/rate-limits.md
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/finops/finops.md
- aid: x2y2:x2y2-loan-api
  name: X2Y2 Loan API
  description: The Loan API from X2Y2 — 1 operation(s) for loan.
  humanURL: https://docs.x2y2.io/developers/api
  baseURL: https://api.x2y2.org
  tags:
  - Loan
  properties:
  - type: OpenAPI
    url: openapi/x2y2-loan-api-openapi.yml
  - type: Documentation
    url: https://docs.x2y2.io/developers/api
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/plans/plans.md
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/rate-limits/rate-limits.md
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/finops/finops.md
- aid: x2y2:x2y2-offer-api
  name: X2Y2 Offer API
  description: The Offer API from X2Y2 — 4 operation(s) for offer.
  humanURL: https://docs.x2y2.io/developers/api
  baseURL: https://api.x2y2.org
  tags:
  - Offer
  properties:
  - type: OpenAPI
    url: openapi/x2y2-offer-api-openapi.yml
  - type: Documentation
    url: https://docs.x2y2.io/developers/api
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/plans/plans.md
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/rate-limits/rate-limits.md
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/finops/finops.md
- aid: x2y2:x2y2-offers-api
  name: X2Y2 Offers API
  description: The Offers API from X2Y2 — 1 operation(s) for offers.
  humanURL: https://docs.x2y2.io/developers/api
  baseURL: https://api.x2y2.org
  tags:
  - Offers
  properties:
  - type: OpenAPI
    url: openapi/x2y2-offers-api-openapi.yml
  - type: Documentation
    url: https://docs.x2y2.io/developers/api
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/plans/plans.md
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/rate-limits/rate-limits.md
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/finops/finops.md
- aid: x2y2:x2y2-orders-api
  name: X2Y2 Orders API
  description: The Orders API from X2Y2 — 4 operation(s) for orders.
  humanURL: https://docs.x2y2.io/developers/api
  baseURL: https://api.x2y2.org
  tags:
  - Order
  tags_raw:
  - Orders
  properties:
  - type: OpenAPI
    url: openapi/x2y2-orders-api-openapi.yml
  - type: Documentation
    url: https://docs.x2y2.io/developers/api
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/plans/plans.md
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/rate-limits/rate-limits.md
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/x2y2/refs/heads/main/finops/finops.md
common:
- type: AgenticAccess
  url: agentic-access/x2y2-agentic-access.yml
- type: DomainSecurity
  url: security/x2y2-domain-security.yml
- type: Authentication
  url: authentication/x2y2-authentication.yml
- type: GitHub
  url: https://github.com/X2Y2-io
- type: SDKs
  url: https://github.com/X2Y2-io/x2y2-sdk
- type: npm
  url: https://www.npmjs.com/package/@x2y2-io/sdk
- type: Documentation
  url: https://docs.x2y2.io/developers/api
- type: APIReference
  url: https://x2y2.readme.io/reference/introduction
maintainers:
- FN: API Evangelist
  url: https://apievangelist.com
  email: info@apievangelist.com

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this
  • find_providersBrowse and filter every provider in the catalog.
  • get_provider_artifactsEvery artifact this provider publishes, grouped by type.
  • get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
  • get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
  • get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
  • get_provider_ratingPRO — composite, band, trend and facet scores.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools

Call it yourself

curl for this page
This provider 
curl "https://apis.io/api/v1/providers/x2y2"
All providers 
curl "https://apis.io/api/v1/providers?limit=25"
Every operation they expose 
curl "https://apis.io/api/v1/providers/x2y2/operations?limit=25"
How their score was established 
curl "https://apis.io/api/v1/providers/x2y2/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.