[SDK] Improve token info discovery for x402 payments

.changeset/dirty-experts-kiss.md

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+---
+"thirdweb": patch
+---
+
+Improve token info discovery for x402 payments

apps/playground-web/src/app/payments/x402/components/X402LeftSection.tsx

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+"use client";
+
+import type React from "react";
+import { useId, useState } from "react";
+import { defineChain } from "thirdweb/chains";
+import { BridgeNetworkSelector } from "@/components/blocks/NetworkSelectors";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { TokenSelector } from "@/components/ui/TokenSelector";
+import { THIRDWEB_CLIENT } from "@/lib/client";
+import type { TokenMetadata } from "@/lib/types";
+import type { X402PlaygroundOptions } from "./types";
+
+export function X402LeftSection(props: {
+  options: X402PlaygroundOptions;
+  setOptions: React.Dispatch<React.SetStateAction<X402PlaygroundOptions>>;
+}) {
+  const { options, setOptions } = props;
+
+  // Local state for chain and token selection
+  const [selectedChain, setSelectedChain] = useState<number | undefined>(() => {
+    return options.chain?.id;
+  });
+
+  const [selectedToken, setSelectedToken] = useState<
+    { chainId: number; address: string } | undefined
+  >(() => {
+    if (options.tokenAddress && options.chain?.id) {
+      return {
+        address: options.tokenAddress,
+        chainId: options.chain.id,
+      };
+    }
+    return undefined;
+  });
+
+  const chainId = useId();
+  const tokenId = useId();
+  const amountId = useId();
+  const payToId = useId();
+
+  const handleChainChange = (chainId: number) => {
+    setSelectedChain(chainId);
+    // Clear token selection when chain changes
+    setSelectedToken(undefined);
+
+    setOptions((v) => ({
+      ...v,
+      chain: defineChain(chainId),
+      tokenAddress: "0x0000000000000000000000000000000000000000" as const,
+      tokenSymbol: "",
+      tokenDecimals: 18,
+    }));
+  };
+
+  const handleTokenChange = (token: TokenMetadata) => {
+    setSelectedToken({
+      address: token.address,
+      chainId: selectedChain!,
+    });
+
+    setOptions((v) => ({
+      ...v,
+      tokenAddress: token.address as `0x${string}`,
+      tokenSymbol: token.symbol ?? "",
+      tokenDecimals: token.decimals ?? 18,
+    }));
+  };
+
+  const handleAmountChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    setOptions((v) => ({
+      ...v,
+      amount: e.target.value,
+    }));
+  };
+
+  const handlePayToChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    setOptions((v) => ({
+      ...v,
+      payTo: e.target.value as `0x${string}`,
+    }));
+  };
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h2 className="mb-4 text-xl font-semibold">Configuration</h2>
+        <div className="space-y-4">
+          {/* Chain selection */}
+          <div className="flex flex-col gap-2">
+            <Label htmlFor={chainId}>Chain</Label>
+            <BridgeNetworkSelector
+              chainId={selectedChain}
+              onChange={handleChainChange}
+              placeholder="Select a chain"
+              className="bg-card"
+            />
+          </div>
+
+          {/* Token selection - only show if chain is selected */}
+          {selectedChain && (
+            <div className="flex flex-col gap-2">
+              <Label htmlFor={tokenId}>Token</Label>
+              <TokenSelector
+                chainId={selectedChain}
+                client={THIRDWEB_CLIENT}
+                enabled={true}
+                onChange={handleTokenChange}
+                placeholder="Select a token"
+                selectedToken={selectedToken}
+                className="bg-card"
+              />
+            </div>
+          )}
+
+          {/* Amount input */}
+          <div className="flex flex-col gap-2">
+            <Label htmlFor={amountId}>Amount</Label>
+            <Input
+              id={amountId}
+              type="text"
+              placeholder="0.01"
+              value={options.amount}
+              onChange={handleAmountChange}
+              className="bg-card"
+            />
+            {options.tokenSymbol && (
+              <p className="text-sm text-muted-foreground">
+                Amount in {options.tokenSymbol}
+              </p>
+            )}
+          </div>
+
+          {/* Pay To input */}
+          <div className="flex flex-col gap-2">
+            <Label htmlFor={payToId}>Pay To Address</Label>
+            <Input
+              id={payToId}
+              type="text"
+              placeholder="0x..."
+              value={options.payTo}
+              onChange={handlePayToChange}
+              className="bg-card"
+            />
+            <p className="text-sm text-muted-foreground">
+              The wallet address that will receive the payment
+            </p>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}

apps/playground-web/src/app/payments/x402/components/X402Playground.tsx

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+"use client";
+
+import React, { useState } from "react";
+import { useActiveAccount } from "thirdweb/react";
+import { chain, token } from "./constants";
+import type { X402PlaygroundOptions } from "./types";
+import { X402LeftSection } from "./X402LeftSection";
+import { X402RightSection } from "./X402RightSection";
+
+const defaultOptions: X402PlaygroundOptions = {
+  chain: chain,
+  tokenAddress: token.address as `0x${string}`,
+  tokenSymbol: token.symbol,
+  tokenDecimals: token.decimals,
+  amount: "0.01",
+  payTo: "0x0000000000000000000000000000000000000000",
+};
+
+export function X402Playground() {
+  const [options, setOptions] = useState<X402PlaygroundOptions>(defaultOptions);
+  const activeAccount = useActiveAccount();
+
+  // Update payTo address when wallet connects, but only if it's still the default
+  React.useEffect(() => {
+    if (
+      activeAccount?.address &&
+      options.payTo === "0x0000000000000000000000000000000000000000"
+    ) {
+      setOptions((prev) => ({
+        ...prev,
+        payTo: activeAccount.address as `0x${string}`,
+      }));
+    }
+  }, [activeAccount?.address, options.payTo]);
+
+  return (
+    <div className="relative flex flex-col-reverse gap-6 xl:min-h-[900px] xl:flex-row xl:gap-6">
+      <div className="grow border-b pb-10 xl:mb-0 xl:border-r xl:border-b-0 xl:pr-6">
+        <X402LeftSection options={options} setOptions={setOptions} />
+      </div>
+      <X402RightSection options={options} />
+    </div>
+  );
+}