docs: add npm README and MIT license

.changeset/add-readme-license.md

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+---
+"@abstract-foundation/mpp": patch
+---
+
+Add npm README and MIT license

packages/mpp/LICENSE

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+MIT License
+
+Copyright (c) 2026 Abstract Foundation
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/mpp/README.md

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+# @abstract-foundation/mpp
+
+[MPP](https://github.com/anthropics/mppx) payment method plugin for the [Abstract](https://abs.xyz) blockchain. Enables paid API access via two settlement mechanisms: one-time ERC-3009 charges and ERC-20 payment channel sessions.
+
+## Install
+
+```bash
+npm install @abstract-foundation/mpp mppx viem zod
+```
+
+## How it works
+
+Both payment methods follow the same HTTP protocol:
+
+1. Client requests a resource
+2. Server responds `402 Payment Required` with `WWW-Authenticate: Payment method="abstract"`
+3. Client signs and retries with `Authorization: Payment <credential>`
+4. Server verifies, settles on-chain, responds `200 OK` with `Payment-Receipt`
+
+The `mppx` framework handles the 402 negotiation loop. This package implements the Abstract-specific signing and settlement logic on top.
+
+## Payment methods
+
+### Charge (ERC-3009)
+
+One-time payments. The client signs ERC-3009 `TransferWithAuthorization` typed data — no transaction from the client side. The server broadcasts `transferWithAuthorization()` on USDC.e, paying gas (optionally via an Abstract paymaster).
+
+### Session (Payment channels)
+
+Streaming payments via `AbstractStreamChannel.sol`. The client opens a channel once (approve + `open()`), depositing USDC.e into escrow. Each subsequent request exchanges a signed EIP-712 voucher with a cumulative amount. The server accumulates the highest voucher and calls `settle()` or `close()` to finalize.
+
+## Usage
+
+### Server
+
+```ts
+import { Mppx } from 'mppx/server'
+import { abstract } from '@abstract-foundation/mpp/server'
+import { privateKeyToAccount } from 'viem/accounts'
+
+const mppx = Mppx.create({
+  methods: [
+    abstract.charge({
+      account: privateKeyToAccount(process.env.SERVER_PRIVATE_KEY),
+      recipient: '0xYourRecipientAddress',
+      amount: '0.01',
+      testnet: true,
+    }),
+    abstract.session({
+      account: privateKeyToAccount(process.env.SERVER_PRIVATE_KEY),
+      recipient: '0xYourRecipientAddress',
+      amount: '0.001',
+      suggestedDeposit: '1',
+      testnet: true,
+    }),
+  ],
+  secretKey: process.env.MPP_SECRET_KEY,
+})
+```
+
+### Client
+
+```ts
+import { abstractCharge, abstractSession } from '@abstract-foundation/mpp/client'
+import { privateKeyToAccount } from 'viem/accounts'
+
+const account = privateKeyToAccount('0x...')
+
+const charge = abstractCharge({ account })
+const session = abstractSession({ account, deposit: '10' })
+```
+
+Both return `mppx` method objects that plug directly into the `mppx` client.
+
+## Exports
+
+| Entry point | Description |
+|---|---|
+| `@abstract-foundation/mpp` | All exports (client + server + constants) |
+| `@abstract-foundation/mpp/client` | Client-side charge and session methods |
+| `@abstract-foundation/mpp/server` | Server-side charge and session handlers |
+
+## Chain support
+
+| | Testnet (11124) | Mainnet (2741) |
+|---|---|---|
+| USDC.e | `0xbd28...008C61` | `0x84A7...987e1` |
+| AbstractStreamChannel | `0x2963...0923c` | `0x2963...0923c` |
+
+The plugin defaults to mainnet. Pass `testnet: true` on the server or let the server challenge dictate the chain on the client.
+
+## Paymaster support
+
+Abstract uses ZKsync-native paymasters. Pass `paymasterAddress` to sponsor gas:
+
+```ts
+abstract.charge({
+  account,
+  recipient: '0x...',
+  amount: '0.01',
+  paymasterAddress: '0xYourPaymasterContract',
+})
+```
+
+## Smart wallet support
+
+Client-side signing supports both EOA and ERC-1271 smart wallets via `viem`'s typed data signing.
+
+## License
+
+[MIT](./LICENSE)

packages/mpp/package.json

@@ -1,12 +1,14 @@
 {
   "name": "@abstract-foundation/mpp",
   "version": "0.1.2",
+  "license": "MIT",
   "description": "MPP payment method plugin for Abstract chain — ERC-3009 charge + ERC-20 session escrow",
   "type": "module",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",
   "files": [
-    "dist"
+    "dist",
+    "LICENSE"
   ],
   "exports": {
     ".": {