# 0x

**Canonical:** https://apis.io/providers/0x/  
**Website:** https://0x.org  
**APIs profiled:** 5

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.

## Kin Score — 58.1 / 100 (strong)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.5 from 57.6).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 64.0 |
| Governance | 28.8 |
| Contract Governance | 28.8 |
| Operational Transparency | 65.8 |
| Developer Ergonomics | 50.0 |
| Commercial Clarity | 63.2 |
| Access Clarity | 63.2 |

## Agent readiness — 35.0 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (5)

- **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

## Agentic access (1)

- **0X Agentic Access** — 19 operations · 1 acting

## Security (2)

- **0X Authentication** — apiKey · 1 scheme
- **0X Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Plans (1)

- **0X Plans Pricing**

## Tags

Cryptocurrency, DeFi, DEX Aggregator, Swap, Gasless, Cross-Chain, Permit2, Liquidity, Trade Analytics, Web3, Settlement, Smart Contracts

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/0x/). Scores are computed from the provider's own public artifacts under a published rubric.