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

# MPP

> Use the Machine Payments Protocol on Abstract for charge payments and session-based micro-payments.

MPP is an HTTP-native payment protocol for paid APIs on Abstract.

At a high level:

* the server challenges a paid request
* the client signs a payment credential
* the request is retried with an authorization header
* the server settles directly on-chain

## Payment modes

### Charge

Use charge payments for one-off requests.

* one signed authorization per request
* built around ERC-3009 transfer authorization
* no channel state to maintain

### Session

Use session payments when a client will make repeated requests.

* open a channel once on-chain
* send cumulative off-chain vouchers after that
* settle when the server chooses

## Why use MPP

* one protocol for one-off and repeated machine payments
* purpose-built for agentic HTTP flows
* lower repeated-request overhead with session channels

## MPP vs x402

|                            | x402                  | MPP                     |
| -------------------------- | --------------------- | ----------------------- |
| **Best entry point**       | Fastest existing path | Richer protocol surface |
| **One-off payments**       | Yes                   | Yes                     |
| **Session micro-payments** | Not the core model    | First-class             |

## Abstract package and endpoints

|                     |                                              |
| ------------------- | -------------------------------------------- |
| **Package**         | `@abstract-foundation/mpp`                   |
| **Demo**            | `https://mpp.abs.xyz`                        |
| **Repository**      | `Abstract-Foundation/mpp-abstract`           |
| **Mainnet USDC.e**  | `0x84A71ccD554Cc1b02749b35d22F684CC8ec987e1` |
| **Testnet USDC.e**  | `0xbd28Bd5A3Ef540d1582828CE2A1a657353008C61` |
| **Escrow contract** | `0x29635C384f451a72ED2e2a312BCeb8b0bDC0923c` |

## Get started

<CardGroup cols={2}>
  <Card title="Charge Payments" icon="credit-card" href="/ai-agents/payments/mpp/charge-payments">
    Integrate one-off paid requests.
  </Card>

  <Card title="Session Payments" icon="activity" href="/ai-agents/payments/mpp/session-payments">
    Open channels and settle cumulative vouchers for repeated requests.
  </Card>
</CardGroup>