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 API contracts indexed 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 Transactions.

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 📡 Profile data on GitHub

51.6/100 developing ▬ flat Agent 27/100 agent aware Front door AI 3/6 light Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

2 published contracts 1 MCP Servers

Cryptocurrency DeFi DEX Aggregator Swap Gasless Transactions Cross-ChainPermit2Liquidity Trade Analytics Web3 Settlement Smart Contracts

Kin Score

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

Composite quality — 51.6/100 · developing

Contract Quality 12.0 / 19

Developer Ergonomics 7.0 / 15

Access Clarity 7.9 / 15

Operational Transparency 4.1 / 10

Contract Governance 3.0 / 9

Discoverability 5.1 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

7 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 46.4 — up to +10.7 composite points
Access Clarity scores 52.6 — up to +9.5 composite points
Contract Quality scores 63.9 — up to +9.0 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/0x/apis.yml: open an issue on github.com/api-evangelist/0x 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
x402 Micropayments & Agentic Pay-per-Call	standard	40.9 (thin)	-	-

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.

Model Context Protocol (MCP)

Model Context Protocol servers that expose these APIs to AI agents.

0x MCP Server

Remote MCP server at docs.0x.org over HTTP; 1 tool listed.

MCP SERVER

0x API pricing

Prices published by 0x, read 2026-10-28 from 0x.org/pricing.

Plan	Price
Standard	$1000 Includes: 0.15% transaction fee; 5 Requests per second; EVM, Solana, Gasless and Cross-chain swaps; real-time
Enterprise	$2500 Includes: Volume based discounts; Higher volume API request support; EVM, Solana, Gasless and Cross-chain swap

Plan details, limits and sources →

Rate limits

Free / Developer Tier: 1 requests per second
Standard Tier: 5 requests per second
Custom / Enterprise Tier: 100 requests per second

Compiled by API Evangelist, not yet checked against 0x's documentation. All 5 limits →

Billed by: subscription · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

0X Plans Pricing

2 plans

PLANS

0X Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

0X Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

0x

SLA

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 — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

0x API Rules

27 rules · 11 errors 12 warnings 4 info

SPECTRAL

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

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

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

StatusPage

ChangeLog

SupportedChains

APIIssues

FAQ

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)

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.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/0x.png
x-docs-platform: fern
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-17
tags:
- Cryptocurrency
- DeFi
- DEX Aggregator
- Swap
- Gasless Transactions
- Cross-Chain
- Permit2
- Liquidity
- Trade Analytics
- Web3
- Settlement
- Smart Contracts
tags_raw:
- 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: '0.23'
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 Transactions
  tags_raw:
  - 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

0x API — frequently asked questions

Does 0x have an API?

Yes. APIs.io lists 5 APIs from 0x, including 0x Cross-Chain API, 0x Gasless API and 0x Sources API, and 2 more.

Is there an OpenAPI specification for the 0x API?

Yes. APIs.io indexes 5 OpenAPI specifications for 0x, each linked for download from this page.

How do I authenticate with the 0x API?

0x uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as 0X Authentication.

How much does the 0x API cost?

0x publishes its prices; its Standard plan is $1000 as of 2026-10-28. APIs.io lists 2 pricing plans for 0x, with each plan's price, limits and inclusions under Pricing on this page.

Does 0x have an MCP server?

Yes. APIs.io lists 1 MCP server for 0x: Remote MCP server at docs.0x.org over HTTP; 1 tool listed.

Is the 0x API ready for AI agents?

0x has a Kin Score of 51.6 out of 100 (developing) and an Agent Readiness score of 26.7 (agent-aware), scored by API Evangelist on 2026-11-06.

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 →

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Every operation they expose

curl "https://apis.io/api/v1/providers/0x/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/0x/evidence"

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