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4Mica is more than a protocol. It gives you the tools to add x402 microtransactions across apps, agents, APIs, and services. Use this page as a map to the protocol, facilitator, SDKs, middleware, and hosted tools that make up 4Mica.

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Protocol

The foundation for collateral, credit, and settlement.

Core4Mica contracts

Learn how collateral is deposited, withdrawn, and used to secure future payment guarantees.

Settlement

Understand how guarantees are cleared, how defaults are covered, and how 4Mica reduces on-chain transactions.

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Payments

The services that make 4Mica usable inside x402 payment flows.

Facilitator

See the role the facilitator plays between buyer clients, seller routes, and protocol settlement.

Payment flow

Follow the request lifecycle from HTTP 402 response to signed guarantee and protected content.

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SDKs and middleware

Developer tools for adding 4Mica to your own app, API, agent, or backend service.

NodeJS

Python

Rust

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Hosted tools

Hosted tools for getting configured, testing flows, and moving toward production.

4Mica app

Set up a wallet and collateral visually before moving the flow into an SDK.

Supported networks

Choose the right testnet or production network for your buyer, seller, or route.