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OnDB supports multiple payment flows for different use cases. All payments are made in USDC.

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Payment Methods Overview

MethodDescriptionBest For
Payment CallbackSDK invokes callback when payment neededMost applications
Auto-Pay (Agent Key)Automatic payments via X-Agent-KeyAutonomous agents
Pre-paidPayment made before requestBatch operations

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Payment Callback

The recommended approach for most applications. The SDK handles the entire flow automatically: 
const result = await client.store(
  {
    collection: 'posts',
    data: [{ title: 'Hello', content: 'World' }]
  },
  // Payment callback - invoked when server requires payment
  async (quote) => {
    console.log('Payment required:', quote.totalCost);
    console.log('Pay to:', quote.brokerAddress);

    // Execute payment via your wallet
    const txHash = await processPayment(quote);

    return {
      txHash,
      network: quote.network,
      sender: walletAddress,
      chainType: quote.chainType,
      paymentMethod: 'native'
    };
  },
  true // waitForConfirmation
);

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Quote Structure

The quote object contains all payment details: 
interface X402Quote {
  quoteId: string;           // Unique quote identifier
  totalCost: number;         // Total cost in USDC
  amountRaw: string;         // Amount in smallest units
  brokerAddress: string;     // Address to pay
  description: string;       // Payment description
  expiresAt: number;         // Quote expiration timestamp
  network: string;           // Network identifier (e.g., "base", "solana")
  asset: string;             // Asset address/identifier
  tokenSymbol: string;       // Token symbol (e.g., "USDC")
  tokenDecimals: number;     // Token decimal places (e.g., 6 for USDC)
  chainType: 'cosmos' | 'evm' | 'solana';
  paymentMethod: 'native' | 'x402-facilitator';
  facilitator?: string;      // Facilitator URL (if applicable)
  allOptions: X402PaymentRequirement[]; // All available payment options
}

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Auto-Pay (Agent Key)

When using an Agent Key (an App Key with Pay permission), payments are handled automatically by the broker — no callback needed: 
import { createClient } from '@ondb/sdk';

const agent = createClient({
  endpoint: 'https://api.ondb.io',
  appId: 'my_agent_app',
  agentKey: 'app_a3f9...'  // X-Agent-Key header — key must have Pay permission
});

// No callback needed - payment is automatic
await agent.store({
  collection: 'target_app::data',
  data: [{ content: 'example' }]
});
The broker verifies the agent’s pay limits, transfers USDC automatically, and completes the write. See Agent Keys for configuration and spend limits.

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Pre-paid Transaction

For scenarios where you’ve already made the payment, pass the payment proof via the callback: 
// Payment was made separately
const paymentTxHash = 'ABC123...';

// Include payment proof via the callback
const result = await client.store(
  { collection: 'data', data: [{ content: 'example' }] },
  async (quote) => ({
    txHash: paymentTxHash,
    network: quote.network,
    sender: walletAddress,
    chainType: quote.chainType,
    paymentMethod: 'native'
  }),
  true
);

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Wallet Integration Example

The payment callback is wallet-agnostic. You provide a function that processes the quote and returns a payment result: 
const paymentCallback = async (quote) => {
  // Use any wallet or payment provider to send USDC
  const txHash = await processPayment(quote);

  return {
    txHash,
    network: quote.network,
    sender: walletAddress,
    chainType: quote.chainType,
    paymentMethod: 'native'
  };
};

await client.store(
  { collection: 'data', data: [{ key: 'value' }] },
  paymentCallback,
  true
);

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Next Steps

PriceIndex

Value-based payment model

Paid Reads

HTTP 402 for read operations