0x website screenshot

0x

0x is the institutional-grade DEX aggregation and crypto liquidity infrastructure platform that powers token swaps inside hundreds of consumer wallets, exchanges, and onchain apps. The 0x API surface aggregates 150+ liquidity sources — public AMMs and exclusive professional market makers — across 20+ EVM chains, exposing four primary products: the Swap API (AllowanceHolder and Permit2 flows) for on-chain swaps, the Gasless API for swaps with no native gas token, the Cross-Chain API for any-token any-chain bridging across 16+ providers, and the Trade Analytics API for monetisation and reporting. Settlement is performed by the 0x Settler smart contracts using the Permit2 standard, and integrators get a unified API key, a TypeScript SDK, an official Agent Skill, and an MCP server for AI-assisted development.

0x publishes 5 APIs on the APIs.io network, including Cross-Chain API, Gasless API, Sources API, and 2 more. Tagged areas include Cryptocurrency, DeFi, DEX Aggregator, Swap, and Gasless.

The 0x catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

0x’s developer surface includes authentication, documentation, developer portal, signup flow, pricing, engineering blog, changelog, and 26 more developer resources.

🌐 Visit website 📡 Source on GitHub
59.6/100 strong ▬ flat Agent 37/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemiumSelf serve⚡ Free to try
5 APIs
CryptocurrencyDeFiDEX AggregatorSwapGaslessCross-ChainPermit2LiquidityTrade AnalyticsWeb3SettlementSmart Contracts

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 59.6/100 · strong
Contract Quality 15.9 / 25
Developer Ergonomics 9.1 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 8.9 / 13
Governance 8.3 / 12
Discoverability 7.4 / 10
Agent readiness — 37/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
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 7 / 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
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/0x: 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 5

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

0x Cross-Chain API

Cross-Chain API endpoints

0x Gasless API

Gasless API endpoints

0x Sources API

Sources API endpoints

0x Swap API

Swap API endpoints

0x Trade Analytics API

Trade Analytics API endpoints

Postman Collections 5

Ready-to-run Postman collections for exercising this provider's APIs.

0x Cross-Chain API

POSTMAN

0x Cross-Chain Gasless API

POSTMAN

0x Cross-Chain Sources API

POSTMAN

0x Cross-Chain Swap API

POSTMAN

0x Cross-Chain Trade Analytics API

POSTMAN

Pricing Plans 1

Published pricing tiers and plan structures.

0X Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

0X Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

0X Finops

FINOPS

Semantic Vocabularies 1

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

0X Context

45 classes · 14 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

0x API Rules

5 rules · 3 warnings 2 info

SPECTRAL

0x API Rules

27 rules · 11 errors 12 warnings 4 info

SPECTRAL

JSON Schema 9

Standalone JSON Schema definitions for this provider's data models.

0x Cross-Chain Quote

12 properties

JSON SCHEMA

0x API Error

3 properties

JSON SCHEMA

0x Gasless Trade

5 properties

JSON SCHEMA

0x Gasless Trade Status

4 properties

JSON SCHEMA

0x Liquidity Source

4 properties

JSON SCHEMA

0x Supported Chain

7 properties

JSON SCHEMA

0x Swap Price

15 properties

JSON SCHEMA

0x Swap Quote

18 properties

JSON SCHEMA

0x Trade Analytics Record

15 properties

JSON SCHEMA

Scroll for all 9

JSON Structure 2

JSON Structure definitions describing this provider's data shapes.

0X Gasless Trade Structure

0 properties

JSON STRUCTURE

0X Swap Quote Structure

0 properties

JSON STRUCTURE

Examples 10

Example request and response payloads for these APIs.

0X Cross Chain Get Quotes Example

2 fields

EXAMPLE

0X Gasless Get Quote Example

2 fields

EXAMPLE

0X Gasless Get Status Example

2 fields

EXAMPLE

0X Gasless Submit Trade Example

2 fields

EXAMPLE

0X Sources Get Sources Example

2 fields

EXAMPLE

0X Swap Allowance Holder Get Price Example

2 fields

EXAMPLE

0X Swap Allowance Holder Get Quote Example

2 fields

EXAMPLE

0X Swap Get Chains Example

2 fields

EXAMPLE

0X Swap Permit2 Get Quote Example

2 fields

EXAMPLE

0X Trade Analytics Swap Example

2 fields

EXAMPLE

Scroll for all 10

Security Posture 2

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

0X Authentication

apiKey · 1 scheme

SECURITY

0X Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

0X Agentic Access

19 operations · 1 acting

19 operations · 1 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal
Portal
 Signup
Signup

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral
Spectral
 Vocabulary
Vocabulary
 JSONLD
JSONLD

Build 8

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace
PostmanWorkspace
 GitHubOrganization
GitHubOrganization
 MCP Server
Tools
 Claude Code Skill (0x-api)
Tools
 0x Parser (Transaction Parsing Library)
Tools
 0x Settler Smart Contracts
Tools
 0x API Code Examples Collection
CodeExamples
 @0x/0x-parser (npm)
SDKs

Scroll for all 8

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Learn 2

Tutorials, courses, talks, and written guidance

Token Swap dApp Course
Tutorials
 Swap Demo Tutorial
Tutorials

Operate 7

Status, limits, changes, and where to get help

HelpCenter
HelpCenter
 StatusPage
StatusPage
 ChangeLog
ChangeLog
 SupportedChains
SupportedChains
 APIIssues
APIIssues
 FAQ
FAQ
 RateLimits
RateLimits

Scroll for all 7

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

Website
Website
 Blog
Blog
 Twitter
Twitter

Other 1

Properties that don't map to a standard resource type

Streaming Availability Review
Review

Source (apis.yml)

apis.yml Raw ↑ 
aid: 0x
url: https://raw.githubusercontent.com/api-evangelist/0x/refs/heads/main/apis.yml
name: 0x
kind: company
description: '0x is the institutional-grade DEX aggregation and crypto liquidity infrastructure platform that powers token
  swaps inside hundreds of consumer wallets, exchanges, and onchain apps. The 0x API surface aggregates 150+ liquidity sources
  — public AMMs and exclusive professional market makers — across 20+ EVM chains, exposing four primary products: the Swap
  API (AllowanceHolder and Permit2 flows) for on-chain swaps, the Gasless API for swaps with no native gas token, the Cross-Chain
  API for any-token any-chain bridging across 16+ providers, and the Trade Analytics API for monetisation and reporting. Settlement
  is performed by the 0x Settler smart contracts using the Permit2 standard, and integrators get a unified API key, a TypeScript
  SDK, an official Agent Skill, and an MCP server for AI-assisted development.'
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/0x.png
tags:
- Cryptocurrency
- DeFi
- DEX Aggregator
- Swap
- Gasless
- Cross-Chain
- Permit2
- Liquidity
- Trade Analytics
- Web3
- Settlement
- Smart Contracts
created: '2026-05-28'
modified: '2026-05-30'
specificationVersion: '0.20'
x-source: public-apis/public-apis
x-category: Cryptocurrency
x-tier: 1
x-type: company
apis:
- aid: 0x:0x-cross-chain-api
  name: 0x Cross-Chain API
  description: Cross-Chain API endpoints
  humanURL: https://0x.org/products/swap
  baseURL: https://api.0x.org
  tags:
  - Cross-Chain
  properties:
  - type: OpenAPI
    url: openapi/0x-cross-chain-api-openapi.yml
  - type: Documentation
    url: https://docs.0x.org/0x-swap-api/introduction
  - type: Signup
    url: https://dashboard.0x.org/create-account
  - type: SDKs
    url: https://github.com/0xProject/0x-swap-ts-sdk-migration
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-with-foundry
  - type: Tutorials
    url: https://docs.0x.org/0x-swap-api/guides/swap-tokens-with-0x-swap-api
  - type: Documentation
    url: https://docs.0x.org/gasless-api/introduction
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-erc4337-smart-account
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-trading-bot
  - type: Documentation
    url: https://docs.0x.org/cross-chain-api/introduction
  - type: Signup
    url: https://0x.org/products/cross-chain
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-streaming-next-app
  - type: Documentation
    url: https://docs.0x.org/trade-analytics-api
  - type: Documentation
    url: https://docs.0x.org/api-reference
- aid: 0x:0x-gasless-api
  name: 0x Gasless API
  description: Gasless API endpoints
  humanURL: https://0x.org/products/swap
  baseURL: https://api.0x.org
  tags:
  - Gasless
  properties:
  - type: OpenAPI
    url: openapi/0x-gasless-api-openapi.yml
  - type: Documentation
    url: https://docs.0x.org/0x-swap-api/introduction
  - type: Signup
    url: https://dashboard.0x.org/create-account
  - type: SDKs
    url: https://github.com/0xProject/0x-swap-ts-sdk-migration
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-with-foundry
  - type: Tutorials
    url: https://docs.0x.org/0x-swap-api/guides/swap-tokens-with-0x-swap-api
  - type: Documentation
    url: https://docs.0x.org/gasless-api/introduction
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-erc4337-smart-account
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-trading-bot
  - type: Documentation
    url: https://docs.0x.org/cross-chain-api/introduction
  - type: Signup
    url: https://0x.org/products/cross-chain
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-streaming-next-app
  - type: Documentation
    url: https://docs.0x.org/trade-analytics-api
  - type: Documentation
    url: https://docs.0x.org/api-reference
- aid: 0x:0x-sources-api
  name: 0x Sources API
  description: Sources API endpoints
  humanURL: https://0x.org/products/swap
  baseURL: https://api.0x.org
  tags:
  - Sources
  properties:
  - type: OpenAPI
    url: openapi/0x-sources-api-openapi.yml
  - type: Documentation
    url: https://docs.0x.org/0x-swap-api/introduction
  - type: Signup
    url: https://dashboard.0x.org/create-account
  - type: SDKs
    url: https://github.com/0xProject/0x-swap-ts-sdk-migration
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-with-foundry
  - type: Tutorials
    url: https://docs.0x.org/0x-swap-api/guides/swap-tokens-with-0x-swap-api
  - type: Documentation
    url: https://docs.0x.org/gasless-api/introduction
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-erc4337-smart-account
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-trading-bot
  - type: Documentation
    url: https://docs.0x.org/cross-chain-api/introduction
  - type: Signup
    url: https://0x.org/products/cross-chain
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-streaming-next-app
  - type: Documentation
    url: https://docs.0x.org/trade-analytics-api
  - type: Documentation
    url: https://docs.0x.org/api-reference
- aid: 0x:0x-swap-api
  name: 0x Swap API
  description: Swap API endpoints
  humanURL: https://0x.org/products/swap
  baseURL: https://api.0x.org
  tags:
  - Swap
  properties:
  - type: OpenAPI
    url: openapi/0x-swap-api-openapi.yml
  - type: Documentation
    url: https://docs.0x.org/0x-swap-api/introduction
  - type: Signup
    url: https://dashboard.0x.org/create-account
  - type: SDKs
    url: https://github.com/0xProject/0x-swap-ts-sdk-migration
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-with-foundry
  - type: Tutorials
    url: https://docs.0x.org/0x-swap-api/guides/swap-tokens-with-0x-swap-api
  - type: Documentation
    url: https://docs.0x.org/gasless-api/introduction
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-erc4337-smart-account
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-trading-bot
  - type: Documentation
    url: https://docs.0x.org/cross-chain-api/introduction
  - type: Signup
    url: https://0x.org/products/cross-chain
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-streaming-next-app
  - type: Documentation
    url: https://docs.0x.org/trade-analytics-api
  - type: Documentation
    url: https://docs.0x.org/api-reference
- aid: 0x:0x-trade-analytics-api
  name: 0x Trade Analytics API
  description: Trade Analytics API endpoints
  humanURL: https://0x.org/products/swap
  baseURL: https://api.0x.org
  tags:
  - Trade Analytics
  properties:
  - type: OpenAPI
    url: openapi/0x-trade-analytics-api-openapi.yml
  - type: Documentation
    url: https://docs.0x.org/0x-swap-api/introduction
  - type: Signup
    url: https://dashboard.0x.org/create-account
  - type: SDKs
    url: https://github.com/0xProject/0x-swap-ts-sdk-migration
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-allowance-holder-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-permit2-next-app
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/swap-v2-with-foundry
  - type: Tutorials
    url: https://docs.0x.org/0x-swap-api/guides/swap-tokens-with-0x-swap-api
  - type: Documentation
    url: https://docs.0x.org/gasless-api/introduction
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-erc4337-smart-account
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/gasless-v2-trading-bot
  - type: Documentation
    url: https://docs.0x.org/cross-chain-api/introduction
  - type: Signup
    url: https://0x.org/products/cross-chain
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-headless-example
  - type: CodeExamples
    url: https://github.com/0xProject/0x-examples/tree/main/cross-chain-streaming-next-app
  - type: Documentation
    url: https://docs.0x.org/trade-analytics-api
  - type: Documentation
    url: https://docs.0x.org/api-reference
common:
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/0x/overview
- type: AgenticAccess
  url: agentic-access/0x-agentic-access.yml
- type: DomainSecurity
  url: security/0x-domain-security.yml
- type: Authentication
  url: authentication/0x-authentication.yml
- type: Website
  url: https://0x.org
- type: Documentation
  url: https://docs.0x.org
- type: Portal
  url: https://dashboard.0x.org
- type: Signup
  url: https://dashboard.0x.org/create-account
- type: Pricing
  url: https://0x.org/pricing
- type: Blog
  url: https://0x.org/post
- type: GitHubOrganization
  url: https://github.com/0xProject
- type: Twitter
  url: https://x.com/0xProject
- type: HelpCenter
  url: https://help.0x.org
- type: StatusPage
  url: https://status.0x.org
- type: ChangeLog
  url: https://docs.0x.org/changelog
- type: Tools
  title: MCP Server
  url: https://docs.0x.org/_mcp/server
- type: Tools
  title: Claude Code Skill (0x-api)
  url: https://github.com/0xProject/0x-ai
- type: Tools
  title: 0x Parser (Transaction Parsing Library)
  url: https://github.com/0xProject/0x-parser
- type: Tools
  title: 0x Settler Smart Contracts
  url: https://github.com/0xProject/0x-settler
- type: CodeExamples
  title: 0x API Code Examples Collection
  url: https://github.com/0xProject/0x-examples
- type: SDKs
  title: '@0x/0x-parser (npm)'
  url: https://www.npmjs.com/package/@0x/0x-parser
- type: Tutorials
  title: Token Swap dApp Course
  url: https://github.com/0xProject/token-swap-dapp-course-code
- type: Tutorials
  title: Swap Demo Tutorial
  url: https://github.com/0xProject/swap-demo-tutorial
- type: SupportedChains
  url: https://docs.0x.org/introduction/supported-chains
- type: APIIssues
  url: https://docs.0x.org/introduction/api-issues
- type: FAQ
  url: https://docs.0x.org/introduction/faq
- type: Plans
  url: plans/0x-plans-pricing.yml
- type: RateLimits
  url: rate-limits/0x-rate-limits.yml
- type: FinOps
  url: finops/0x-finops.yml
- type: Spectral
  url: rules/0x-rules.yml
- type: Vocabulary
  url: vocabulary/0x-vocabulary.yml
- type: JSONLD
  url: json-ld/0x-context.jsonld
- type: Review
  title: Streaming Availability Review
  url: review.yml
integrations:
- name: Coinbase
- name: MetaMask
- name: Phantom
- name: Brave
- name: Rainbow Wallet
- name: Polygon
- name: DeFi Saver
- name: Matcha
- name: Ethereum
- name: Arbitrum
- name: Base
- name: Optimism
- name: BNB Smart Chain
- name: Avalanche
- name: Polygon
- name: Linea
- name: Scroll
- name: Berachain
- name: Abstract
- name: HyperEVM
- name: Ink
- name: Mantle
- name: Monad
- name: Plasma
- name: Sonic
- name: Tempo
- name: Unichain
- name: World Chain
- name: Solana
- name: HyperCore
- name: Tron
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com