MPP for OpenClaw

Give OpenClaw access to pay-per-use APIs without managing a separate API key or subscription for every service. The plugin installs a payment-aware fetch in the Gateway so HTTP and MCP calls can handle MPP HTTP 402 charges and streaming sessions using a capped, expiring Tempo Wallet access key.

Maintained by Tempo, the team behind MPP.

Quick start

[!IMPORTANT] Tempo Wallet setup uses Tempo mainnet and authorizes real USDC spending. The default access key expires after seven days and has a total 10 USDC spending limit.

Install from ClawHub, connect Tempo Wallet, and restart the active gateway:

openclaw plugins install clawhub:openclaw-mpp
openclaw mpp setup
openclaw gateway restart

Verify both the wallet and the live gateway runtime:

openclaw mpp status
openclaw plugins inspect mpp --runtime --json

During OpenClaw's registry transition, npm remains available as an explicit fallback:

openclaw plugins install npm:openclaw-mpp

Make a first paid request

Send this prompt through OpenClaw:

Use mpp_fetch to POST {"query":"What is the Tempo blockchain?"} as JSON to https://exa.mpp.tempo.xyz/search.

This request spends USDC.e on Tempo mainnet. A successful request returns HTTP 200, includes the payment receipt, and contains live Exa search results. If OpenClaw selects its built-in web_fetch tool instead, explicitly ask it to use mpp_fetch; built-in web_fetch is not payment-aware.

Connect a wallet

Tempo Wallet

openclaw mpp setup uses the Tempo Accounts SDK to open a Tempo Wallet approval flow. Your wallet authorizes a seven-day access key with a 10 USDC spending limit; your wallet's root private key is never shared with OpenClaw. Mainnet is the default. After approval, setup publishes the access key on the selected network with a zero-value USDC self-transfer so it is ready before the command completes.

Customize the access key policy or create one for Tempo testnet:

openclaw mpp setup --expires 24h --limit USDC=25 --no-deposit
openclaw mpp setup --network testnet
openclaw mpp status --network testnet

Authorize an access key for each network the agent uses. The Accounts SDK selects the matching access key from each payment Challenge's chain ID, so one gateway can handle mainnet and testnet without a network switch. Restart a running gateway after setup with openclaw gateway restart.

Existing access key

To select an access key already stored by Tempo Wallet, add its address to openclaw.json:

{
  "plugins": {
    "entries": {
      "mpp": {
        "config": {
          "wallet": {
            "type": "tempo",
            "accessKey": "0x..."
          }
        }
      }
    }
  }
}

Private key

Set TEMPO_PRIVATE_KEY before starting OpenClaw to use a Tempo private key directly:

TEMPO_PRIVATE_KEY=0x... openclaw gateway run

What it provides

The Gateway payment-aware fetch supports:

• free HTTP requests
• Tempo charge and session challenges
• paid SSE session streams
• fetch-backed MCP tool calls

The mpp_fetch tool uses the same fetch explicitly. OpenClaw's built-in web_fetch and managed MCP transports use separate HTTP clients and are not covered yet.

Free requests do not require a configured wallet. Without a payment account, protected endpoints return their original HTTP 402 Challenge without a payment retry.

The mpp_wallet_setup and mpp_wallet_status tools let an agent start wallet setup and inspect mainnet or testnet access keys. If the active tool profile filters plugin tools, add mpp to the existing tools.alsoAllow list. Gateway startup only loads existing wallet configuration and never opens an authorization flow.

Development

pnpm install
pnpm test
pnpm check
pnpm lint
pnpm pack --dry-run
openclaw plugins install --link .

Package

• Plugin id: mpp
• Package: openclaw-mpp
• Minimum OpenClaw host: 2026.6.11

Security

Report vulnerabilities privately as described in SECURITY.md.

License

MIT