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feat: add custom paymentFetch option to proxy #43

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feat: add custom paymentFetch option to proxy #43

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17 changes: 15 additions & 2 deletions src/proxy.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -788,6 +788,18 @@ export type ProxyOptions = {
/** Port to listen on (default: 8402) */
port?: number;
routingConfig?: Partial<RoutingConfig>;
/**
* Custom payment-enabled fetch function. When provided, replaces the built-in
* x402 payment handler. Use this to integrate alternative payment systems
* (e.g., spend limits, budget enforcement, or custom payment flows).
*
* If not provided, uses built-in createPaymentFetch with walletKey.
*/
paymentFetch?: (
input: RequestInfo | URL,
init?: RequestInit,
preAuth?: PreAuthParams,
) => Promise<Response>;
/** Request timeout in ms (default: 180000 = 3 minutes). Covers on-chain tx + LLM response. */
requestTimeoutMs?: number;
/** Skip balance checks (for testing only). Default: false */
Expand Down Expand Up @@ -956,9 +968,10 @@ export async function startProxy(options: ProxyOptions): Promise<ProxyHandle> {
};
}

// Create x402 payment-enabled fetch from wallet private key
// Create x402 payment-enabled fetch from wallet private key (or use custom paymentFetch)
const account = privateKeyToAccount(options.walletKey as `0x${string}`);
const { fetch: payFetch } = createPaymentFetch(options.walletKey as `0x${string}`);
const payFetch =
options.paymentFetch ?? createPaymentFetch(options.walletKey as `0x${string}`).fetch;

// Create balance monitor for pre-request checks
const balanceMonitor = new BalanceMonitor(account.address);
Expand Down