Is 0x API safe and trustworthy?

tashan scores 0x API on public evidence — see the measured signals. Audit scope: OSV advisories, install-time scripts, build provenance and declared permission surface. We do not review source code or execute the capability.

How do I install 0x API?

Drop the skill folder into ~/.claude/skills/ (user scope) or .claude/skills/ (project scope).

‹ The Index

0x API

skill

Author’s activation text, quoted as published

Step-by-step guide for executing token swaps using the 0x API (Swap API v2 and Gasless API v2). Use this skill when a user wants to: swap tokens on any EVM chain (e.g. "swap 0.5 ETH for USDC on Arbitrum", "sell 1000 ARB and get a quote", "how much WBTC for 5000 USDC on Base"); do a gasless swap without holding ETH for gas; integrate 0x into a dApp in TypeScript or Python (permit2 flow, allowanceholder flow); use 0x with a Gnosis Safe or multisig wallet; migrate from 0x Swap v1 to v2; debug 0x API errors like INSUFFICIENTASSETLIQUIDITY or allowance issues; or understand when to use AllowanceHolder vs Permit2. …

Works with: Claude Code (native) · Cursor, Codex CLI (manual)
native: this artifact type is that client's own format

Install (Claude Code):

cp -r 0x-api ~/.claude/skills/

Adoption: 1 repos

Security audit

Not scanned yet. We audit npm-published capabilities for known advisories, install-time scripts and permission surface; this one has no npm package we can resolve, or has not reached the queue.

Its own instructions

Its SKILL.md says when to use it, shows worked examples, covers setup and states a limitation.

Read from the capability’s own SKILL.md. This is not a grade and does not compare to the instruction-depth verdict on an MCP server — a skill has no tools to document, so that rubric does not apply to it.

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source ↗ · skill:0xProject/0x-api

Everything on this page is public evidence and free. What it cannot know is whether you run this — npx tashan-cli doctor reads your own config and names what is wrong in it, also free. tashan Pro tells you the day any of it changes.

Already running this? npx tashan-cli doctor checks your whole config against the Index — how it works ›

Measured 2026-08-14 · scorer s5 · how · something wrong here?