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Machine payments let AI agents and developers pay per API call with USDC to access Allium’s blockchain data. No API key, no registration, no subscription — just a wallet and USDC.

No API Key

No registration or key management. Your wallet is your identity.

Pay Per Call

Only pay for what you use. Prices start at $0.001 per request.

Agent-Native

Built for AI agents — autonomous payments with no human in the loop.

Gasless Payments

Allium handles onchain settlement. Users only need USDC, not ETH.

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How It Works

Both protocols use HTTP status code 402 Payment Required to negotiate payments inline with API requests. The difference is how much your client handles automatically.
1

Send request

Make a normal API request to any payment-enabled endpoint.
2

Receive 402

The server responds with 402 Payment Required and payment options.
3

Sign and pay

Your client signs a USDC payment authorization and retries the request.
4

Get data

Payment confirmed — you receive your data with a 200 response.

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Tempo MPP

Tempo Machine Payment Protocol is the simplest way to make paid API calls. The Client wrapper handles the entire 402 negotiation, signing, and retry flow — you just make requests as normal. 
from mpp.client import Client
from mpp.methods.tempo import tempo, TempoAccount, ChargeIntent
from mpp.methods.tempo._defaults import TESTNET_RPC_URL, TESTNET_CHAIN_ID
import os

account = TempoAccount.from_key(os.getenv("YOUR_PRIVATE_KEY"))

async with Client(methods=[
    tempo(
        account=account,
        rpc_url=TESTNET_RPC_URL,
        intents={"charge": ChargeIntent()},
    )
]) as client:
    response = await client.post(
        "https://agents.allium.so/api/v1/developer/prices",
        json=[{"chain": "solana", "token_address": "So11111111111111111111111111111111111111112"}],
    )
    print(response.json())

Tempo MPP

Full setup guide, supported networks, and implementation details

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x402

x402 gives you full manual control over the payment flow. Your client receives the 402 response, constructs EIP-712 typed data, signs it via a wallet provider like Privy, and retries with the payment signature attached.

x402

Full setup guide with Privy wallet integration, EIP-712 signing, and implementation

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Agent Integration

Don’t want to write any payment code? Install pre-built agent skills and let your AI agent handle everything: 
npx skills add allium-labs/skills --yes

Agent Skills

Set up machine payments with AI agents in one command

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All Endpoints & Pricing

Endpoints & Pricing

All payment-enabled endpoints, pricing, rate limits, and error codes