Web3 x402

An alternative authentication and billing layer for the web3-tools skill. If you have an X-API-KEY, the web3-tools skill alone is sufficient. If you don't (e.g., autonomous agents), use this skill alongside web3-tools — this skill handles wallet-based auth and USDC payments, while web3-tools provides the API specs and parameters.

When to Use

• Calling Nodit APIs without an API key (wallet + USDC only)
• SIWX authentication (SIWE for EVM, SIWS for Solana)
• Credit mode: pre-charge USDC → off-chain credit deduction per request
• PPU mode: per-request on-chain USDC settlement
• Checking credit balance or transaction history
• Understanding x402 pricing per API operation

When NOT to Use

• Querying blockchain data with a traditional API key → use web3-tools skill instead
• Investment advice or token value speculation

Constraints