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4Mica is the clearing house for the agentic economy: a credit layer for x402 that lets agents and applications transact instantly, earn yield on collateral, and settle net positions later. Instead of forcing every request to become an on-chain transaction, 4Mica lets a payer deposit collateral once, sign off-chain payment guarantees per request, and settle later. Resource servers keep the familiar HTTP 402 flow while gaining programmable credit, non-custodial enforcement, and batched settlement.

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Who 4Mica Is For

  • API providers that want to charge per request without accounts, invoices, or prepaid balances.
  • AI agents that need to pay many services during a task and settle once later.
  • Applications that want x402-compatible payments with credit, collateral, and net settlement.
  • Protocol teams building financial infrastructure for high-frequency agent-to-agent commerce.

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The basic story

1

Deposit Collateral

A payer deposits ETH or a supported into the Core4Mica vault.
2

Protect a Route

A seller protects an HTTP route with x402 payment requirements and publishes the price, asset, network, and recipient address.
3

Sign a Guarantee

The buyer receives HTTP 402, creates a unique request ID, signs a guarantee, and retries the request.
4

Settle the Payment

The seller verifies and settles the payment through the facilitator, then serves the protected response.
5

Clear and Settle

Payable guarantees enter a clearing cycle. Net debtors settle their positions, and locked collateral covers defaults according to protocol rules.

Quickstart

Make your first paid request with 4Mica.

Buyer

Build an agent or client that pays APIs.

Seller

Protect an API, model, dataset, or workflow.