# 2537 Basic 1a39036b

> Basic Swap Integration Test Case

- Skill: `tools-only/2537-basic-1a39036b` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add tools-only/2537-basic-1a39036b`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tools-only/2537-basic-1a39036b/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: tools-only (https://skillmd.com/u/tools-only)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/tools-only/2537-basic-1a39036b

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# Basic Swap Integration Test Case

Build a complete swap integration using the Uniswap Trading API.

## Context

- TypeScript/Node.js backend script
- Need to swap USDC to ETH on Ethereum mainnet
- Using the Uniswap Trading API (not SDK)
- Have a private key for signing

## Requirements

1. Check token approval status via /check_approval endpoint
2. Get a quote via /quote endpoint with proper parameters
3. Execute the swap via /swap endpoint with correct request body format
4. Handle Permit2 fields correctly (strip null permitData)
5. Validate swap response before broadcasting

## Constraints

- Must use the Uniswap Trading API (<https://trade-api.gateway.uniswap.org/v1>)
- Must handle the 3-step flow: check_approval -> quote -> swap
- Must strip null permitData fields from the swap request
- Must validate swap.data is non-empty before broadcasting
- Should include error handling for API failures

## Expected Output

A working TypeScript implementation that demonstrates the complete Trading API swap flow with proper null field handling, Permit2 rules, and pre-broadcast validation.