agentswap

      }      receipt.outcome = "payment_unknown";      await save(); // Persist the SAME signed authorization before a potentially ambiguous paid request.      const headers = new Headers(init?.headers);      for (const [key, value] of Object.entries(state.paymentHeaders)) headers.set(key, value);      log("Paying seller via x402", { intentId, network: chain.caip2, retry: receipt.retry });      const response = await globalThis.fetch(url, { ...init, headers, redirect: "error" });      const encoded = response.headers.get("PAYMENT-RESPONSE") ?? response.headers.get("X-PAYMENT-RESPONSE");      const settlement = encoded ? decodePaymentResponseHeader(encoded) : undefined;      receipt.seller = { httpStatus: response.status, ...(settlement ? { settlement } : {}) };      // A seller's 200 alone is not cryptographic settlement confirmation. Keep unknown outcomes explicit.      receipt.outcome = settlement?.success === true ? "confirmed" : settlement?.success === false || response.status === 402 ? "rejected" : "payment_unknown";      if (settlement?.transaction) log("Payment transaction", `${chain.explorerTx}${settlement.transaction}`);      await save();      return { response, receipt: structuredClone(receipt) };    } catch (error) {      if (state) {        if (state.receipt.funding.signature && error instanceof Error && /failed:/.test(error.message)) state.receipt.outcome = "failed";        // Keep the original exception if journaling itself fails; never broadcast after an unsuccessful save.        try { await save(); } catch { /* caller must reconcile the receipt/signature below */ }        throw new AgentSwapPaymentError(error instanceof Error ? error.message : String(error), structuredClone(state.receipt), { cause: error });      }      throw error;    } finally {

1. Line 186 log("Paying seller via x402", { intentId, network: chain.caip2, retry: receipt.retry });: Uses x402, an HTTP 402 pattern where an agent pays per request with an on-chain payment.
2. Line 187 const response = await globalThis.fetch(url, { ...init, headers, redirect: "error" });: Creates and pays for a new account. Space and payer must be specified.