x402 Vending Machine – Buy $5 USDC of Tokens

Use this endpoint when you want to participate in a token launch on the Heurist vending machine with a fixed $5.00 USDC purchase. Prefer this over the $3 or $4 tier endpoints when you want a higher allocation in a single call, and over the $4 tier when the exact $5 fixed amount matches your intent. Suitable for agents automating token launch participation at a specific price point.

• Token launch is not open for buying — returns an error indicating the sale is inactive
• Allocation cap has been reached — purchase rejected with cap-exceeded error
• Invalid or missing token address — returns validation error
• Invalid recipient address format — returns address parsing error
• Insufficient USDC payment — payment layer rejects the transaction
• Network or blockchain RPC failure — transaction cannot be submitted