x402 Payments

Pay for x402-gated APIs using USDC on Base. This skill enables agents to autonomously make crypto payments when accessing paid web resources.

When to Use This Skill

Use this skill when:

• A skill or agent needs to fetch data from an x402-gated API (e.g., Kaito mindshare)
• You encounter HTTP 402 Payment Required responses
• You need to check your Base wallet balance (USDC + ETH)
• You want to pay for Simmer premium endpoints beyond free tier rate limits

Setup

1. Set your wallet private key

   export EVM_PRIVATE_KEY=0x...your_private_key...
   

   Falls back to WALLET_PRIVATE_KEY if EVM_PRIVATE_KEY is not set (same key Simmer/Polymarket users already have). Your EVM address works on all chains — Polygon for trading, Base for x402 payments.