Pricing - Brickken Documentation

Preparing a transaction (building the unsigned calldata) is free. The x402 USDC charge is collected only at POST /send-transactions, when Brickken broadcasts the operation. The send price below carries the full per-operation cost. Prices are in USDC on Base mainnet.

Method	Prepare	Send
`agentRegister`	`0.00`	`0.98`
`agentSetURI`	`0.00`	`0.48`
`agentSetMetadata`	`0.00`	`0.48`
`agentSetWallet`	`0.00`	`0.98`
`agentTransferOwnership`	`0.00`	`0.98`
`agentGiveFeedback`	`0.00`	`0.24`
`agentRevokeFeedback`	`0.00`	`0.24`
`agentAppendFeedbackResponse`	`0.00`	`0.48`
`agentCreateToken`	`0.00`	`9.98`
`agentMintToken`	`0.00`	`0.10`
`agentBurnToken`	`0.00`	`0.04`
`agentTransferToken`	`0.00`	`0.04`
`agentTransferFromToken`	`0.00`	`0.04`
`agentApproveToken`	`0.00`	`0.02`
`newTokenizedAgent` (legacy registration alias)	`0.00`	`2.98`

Sandbox, Base Sepolia, and other non-production environments use a flat reference price of 0.01 USDC per send.

The exact amount, asset, and chain are always quoted in the PAYMENT-REQUIRED header of the 402 response (and previewed in the prepare response’s x402Requirements). Read them from there rather than hardcoding the table above.

x402 payments and on-chain transactions are non-refundable. Confirm chain, signer/recipient, token address, and expected USDC price before paying.