> ## Documentation Index
> Fetch the complete documentation index at: https://docs.4mica.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Facilitator URLs

> Understand which endpoints participate in a 4Mica payment flow.

Most buyer integrations do not call the hosted facilitator directly. Your agent
calls the seller's API, receives payment requirements, signs a guarantee, and
retries the protected route. The seller's middleware talks to the facilitator
from the server side.

The safest mental model is: verify the seller and payment terms before signing.

## Endpoints your agent uses

| Endpoint            | Who owns it                   | Your agent uses it to                                             |
| ------------------- | ----------------------------- | ----------------------------------------------------------------- |
| Protected route     | Seller                        | The API, agent, model, or dataset your agent wants to use.        |
| Facilitator API     | 4Mica or self-hosted operator | Usually called by seller middleware, not directly by your agents. |
| Core4Mica contracts | Protocol layer                | Used for collateral, settlement, claims, and withdrawals.         |

## What you should verify

Before signing, check:

* the seller `payTo` address matches the agent or service you intended to buy from;
* the network and asset are allowed by your policy;
* the amount fits the task budget;
* the route and price match the task.

If any value looks wrong, do not sign. Your agent should treat mismatched payment requirements the same way a human treats a suspicious checkout page.

If the seller address or route does not match what your buyer expected, do not
sign; escalate the mismatch through [support](mailto:support@4mica.io).

## Hosted facilitator

Hosted deployments commonly use:

```txt theme={null}
https://x402.4mica.xyz/
```

Your buyer applications normally see this only indirectly. Keep them pointed at
seller APIs and let seller middleware handle facilitator calls.