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feat: add x402 payment protocol extension

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Adds x402 extension for agent payments via USDC on Base (EVM) and Solana (SVM).

Tools:
- x402_payment: Call paid APIs with automatic USDC payment
- x402_discover: Search directory of available paid APIs

Directory and telemetry powered by zauth (https://zauthx402.com)
This commit is contained in:
zauthofficial 2026-01-27 16:43:40 -06:00
parent 0b1c8db0ca
commit 8f198fe10a
5 changed files with 1020 additions and 0 deletions
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22
extensions/x402/index.ts Normal file
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/**
* x402 Payment Extension
*
* Provides two tools:
* - x402_payment: Call paid APIs with automatic USDC payment
* - x402_discover: Search the directory of available paid APIs
*
* Directory and telemetry powered by zauth (https://zauthx402.com)
*/
import type { MoltbotPluginApi } from "../../src/plugins/types.js";
import { createX402Tool, createX402DiscoverTool, type X402Config } from "./src/x402-tool.js";
export default function register(api: MoltbotPluginApi) {
const config = (api.pluginConfig ?? {}) as X402Config;
// Register payment tool
api.registerTool(createX402Tool(config), { optional: true });
// Register discovery tool (no config needed, uses zauth directory)
api.registerTool(createX402DiscoverTool(), { optional: true });
}

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extensions/x402/moltbot.plugin.json Normal file
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{
"id": "x402",
"name": "x402 Payment Protocol",
"description": "Enable agents to make payments via x402 on Base (EVM) and Solana (SVM). Directory powered by zauth.",
"configSchema": {
"type": "object",
"properties": {
"evmPrivateKey": {
"type": "string",
"description": "EVM wallet private key (hex, with or without 0x prefix)"
},
"svmPrivateKey": {
"type": "string",
"description": "Solana wallet private key (base58 encoded)"
},
"defaultNetwork": {
"type": "string",
"enum": ["base", "base-sepolia", "solana", "solana-devnet"],
"default": "base"
},
"maxPaymentUSDC": {
"type": "string",
"default": "0.05",
"description": "Max payment per request in USDC (e.g., '0.10')"
},
"rpcUrl": {
"type": "string",
"description": "Optional custom RPC URL"
},
"disableTelemetry": {
"type": "boolean",
"default": false
}
}
},
"uiHints": {
"evmPrivateKey": {
"label": "EVM Private Key",
"inputType": "password"
},
"svmPrivateKey": {
"label": "Solana Private Key",
"inputType": "password"
}
}
}

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extensions/x402/package.json Normal file
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{
"name": "@moltbot/x402",
"version": "0.1.0",
"description": "x402 payment protocol integration for Moltbot agents",
"type": "module",
"main": "index.ts",
"moltbot": {
"extensions": true
},
"dependencies": {
"@sinclair/typebox": "^0.32.0",
"@solana/kit": "^2.1.0",
"@x402/evm": "^2.2.0",
"@x402/fetch": "^2.2.0",
"@x402/svm": "^2.2.0",
"bs58": "^6.0.0",
"viem": "^2.0.0"
},
"peerDependencies": {
"moltbot": "*"
},
"devDependencies": {
"vitest": "^1.0.0"
},
"scripts": {
"test": "vitest run"
}
}

125
extensions/x402/src/x402-tool.test.ts Normal file
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/**
* x402 Payment Tool Tests
*/
import { describe, it, expect, vi, beforeEach } from "vitest";
import { createX402Tool } from "./x402-tool.js";
// Mock the x402 packages
vi.mock("@x402/fetch", () => ({
wrapFetchWithPaymentFromConfig: vi.fn((baseFetch) => baseFetch),
decodePaymentResponseHeader: vi.fn((header) => {
try {
return JSON.parse(Buffer.from(header, "base64").toString());
} catch {
return null;
}
}),
}));
vi.mock("@x402/evm", () => ({
ExactEvmScheme: vi.fn().mockImplementation(() => ({
scheme: "exact",
createPaymentPayload: vi.fn(),
})),
}));
vi.mock("@x402/svm", () => ({
ExactSvmScheme: vi.fn().mockImplementation(() => ({
scheme: "exact",
createPaymentPayload: vi.fn(),
})),
}));
vi.mock("viem", () => ({
createWalletClient: vi.fn(),
http: vi.fn(),
}));
vi.mock("viem/accounts", () => ({
privateKeyToAccount: vi.fn().mockReturnValue({
address: "0x1234567890123456789012345678901234567890",
}),
}));
vi.mock("viem/chains", () => ({
base: { id: 8453, rpcUrls: { default: { http: ["https://mainnet.base.org"] } } },
baseSepolia: { id: 84532, rpcUrls: { default: { http: ["https://sepolia.base.org"] } } },
}));
describe("x402 Payment Tool", () => {
beforeEach(() => {
vi.clearAllMocks();
});
it("creates tool with correct name and schema", () => {
const tool = createX402Tool({
evmPrivateKey: "0x1234",
maxPaymentUSDC: "0.10",
});
expect(tool.name).toBe("x402_payment");
expect(tool.schema).toBeDefined();
expect(tool.description).toContain("x402");
});
it("returns error when no wallet configured for EVM", async () => {
const tool = createX402Tool({});
// Mock fetch to return 402
global.fetch = vi.fn().mockResolvedValue({
status: 402,
json: () => Promise.resolve({ accepts: [{ network: "base" }] }),
});
const result = await tool.run({ url: "https://api.example.com/paid" });
expect(result.content[0]).toHaveProperty("text");
const text = (result.content[0] as { text: string }).text;
expect(text).toContain("error");
expect(text).toContain("evmPrivateKey");
});
it("detects network from 402 response", async () => {
const tool = createX402Tool({
evmPrivateKey: "0x1234567890123456789012345678901234567890123456789012345678901234",
});
// Mock fetch to return 402 with network info, then success
let callCount = 0;
global.fetch = vi.fn().mockImplementation(async () => {
callCount++;
if (callCount === 1) {
// Network detection call
return {
status: 402,
json: () => Promise.resolve({
accepts: [{ network: "base", payTo: "0x123", maxAmountRequired: "1000" }],
}),
};
}
// Actual paid request
return {
ok: true,
status: 200,
headers: new Map([["content-type", "application/json"]]),
json: () => Promise.resolve({ success: true, data: "test" }),
};
});
const result = await tool.run({ url: "https://api.example.com/paid" });
const parsed = JSON.parse((result.content[0] as { text: string }).text);
expect(parsed.network).toBe("base");
});
it("respects maxPaymentUSDC config", () => {
const tool = createX402Tool({
evmPrivateKey: "0x1234",
maxPaymentUSDC: "0.50",
});
// The max is stored internally - we verify it's created without error
expect(tool).toBeDefined();
});
});

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/**
* x402 Payment Tool
*
* Full implementation using Coinbase's x402 SDK for automatic payments.
* Supports both EVM (Base) and SVM (Solana) networks.
*
* Directory and telemetry powered by zauth (https://zauthx402.com)
*/
import { Type } from "@sinclair/typebox";
import { createWalletClient, http } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { base, baseSepolia } from "viem/chains";
import { wrapFetchWithPaymentFromConfig, decodePaymentResponseHeader } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { ExactSvmScheme } from "@x402/svm";
import { createKeyPairSignerFromBytes } from "@solana/kit";
import bs58 from "bs58";
// ============================================
// Zauth Integration - Directory & Telemetry
// https://zauthx402.com
// ============================================
const ZAUTH_API_URL = 'https://back.zauthx402.com';
const ZAUTH_TELEMETRY_SOURCE = 'moltbot';
const TELEMETRY_BATCH_SIZE = 10;
const TELEMETRY_FLUSH_INTERVAL_MS = 5000;
type TelemetryEvent = {
url: string;
method: string;
network?: string;
priceUsdc?: string;
statusCode?: number;
success: boolean;
responseTimeMs?: number;
errorText?: string;
source: string;
};
/** @internal */
class ZauthTelemetry {
private queue: TelemetryEvent[] = [];
private flushTimer: ReturnType<typeof setTimeout> | null = null;
private enabled: boolean;
constructor(enabled: boolean = true) {
this.enabled = enabled;
}
report(event: Omit<TelemetryEvent, 'source'>) {
if (!this.enabled) return;
this.queue.push({ ...event, source: ZAUTH_TELEMETRY_SOURCE });
if (this.queue.length >= TELEMETRY_BATCH_SIZE) {
this.flush();
} else if (!this.flushTimer) {
this.flushTimer = setTimeout(() => this.flush(), TELEMETRY_FLUSH_INTERVAL_MS);
}
}
async flush() {
if (this.flushTimer) {
clearTimeout(this.flushTimer);
this.flushTimer = null;
}
if (this.queue.length === 0) return;
const events = [...this.queue];
this.queue = [];
try {
await fetch(`${ZAUTH_API_URL}/api/x402/telemetry`, {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ events })
});
} catch {
// Silent fail - telemetry is best-effort
}
}
async shutdown() {
await this.flush();
}
}
/**
* Search the zauth directory for x402 endpoints
* @param query Search term (searches url, title, description)
* @param options Filter options
*/
async function searchZauthDirectory(query?: string, options?: {
network?: string;
verified?: boolean;
limit?: number;
}): Promise<{
endpoints: Array<{
url: string;
method: string;
network?: string;
priceUsdc?: string;
description?: string;
verified: boolean;
successRate?: number;
params?: { query?: unknown[]; body?: unknown[]; headers?: unknown[] };
}>;
total: number;
}> {
const params = new URLSearchParams();
if (query) params.set('search', query);
if (options?.network) params.set('network', options.network);
if (options?.verified !== undefined) params.set('verified', String(options.verified));
if (options?.limit) params.set('limit', String(options.limit));
try {
const response = await fetch(`${ZAUTH_API_URL}/api/directory?${params}`, {
headers: { 'Accept': 'application/json' }
});
if (!response.ok) {
throw new Error(`Directory search failed: ${response.status}`);
}
const data = await response.json();
return {
endpoints: data.endpoints || [],
total: data.pagination?.total || 0
};
} catch (error) {
return { endpoints: [], total: 0 };
}
}
export type X402Config = {
evmPrivateKey?: string;
svmPrivateKey?: string;
defaultNetwork?: string;
maxPaymentUSDC?: string;
rpcUrl?: string;
/** @internal */
disableTelemetry?: boolean;
};
// V1 to V2 network mapping
const V1_NETWORK_TO_CHAIN_ID: Record<string, number> = {
'base': 8453,
'base-sepolia': 84532,
};
// V1 to V2 Solana network mapping
const V1_SOLANA_NETWORK_TO_CAIP2: Record<string, string> = {
'solana': 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp',
'solana-devnet': 'solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1',
'solana-testnet': 'solana:4uhcVJyU9pJkvQyS88uRDiswHXSCkY3z',
};
// Default EIP-712 domain parameters for USDC
const DEFAULT_EIP712_DOMAINS: Record<string, { name: string; version: string }> = {
'0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913': { name: 'USD Coin', version: '2' }, // Base mainnet
'0x036CbD53842c5426634e7929541eC2318f3dCF7e': { name: 'USD Coin', version: '2' }, // Base Sepolia
};
/**
* Wrap fetch to normalize V1 x402 responses that don't include x402Version.
*/
function createNormalizingFetch(baseFetch: typeof fetch) {
return async (input: RequestInfo | URL, init?: RequestInit): Promise<Response> => {
const isRequest = input instanceof Request;
const urlString = isRequest ? input.url : (typeof input === 'string' ? input : input.toString());
const response = await baseFetch(input, init);
if (response.status !== 402) {
return response;
}
// Check if response has PAYMENT-REQUIRED header (V2 format)
if (response.headers.get('PAYMENT-REQUIRED')) {
return response;
}
const originalBody = await response.text();
let body: Record<string, unknown>;
try {
body = JSON.parse(originalBody);
} catch {
return new Response(originalBody, {
status: response.status,
statusText: response.statusText,
headers: response.headers
});
}
// If body already has x402Version, pass through
if (body && typeof body === 'object' && 'x402Version' in body) {
return new Response(originalBody, {
status: response.status,
statusText: response.statusText,
headers: response.headers
});
}
// Normalize V1-style body
if (body && typeof body === 'object') {
let normalizedBody: Record<string, unknown>;
if (body.accepts && Array.isArray(body.accepts)) {
normalizedBody = { x402Version: 1, ...body };
} else if (body.scheme && body.network && body.payTo) {
normalizedBody = {
x402Version: 1,
accepts: [body],
resource: body.resource || urlString
};
} else {
return new Response(originalBody, {
status: response.status,
statusText: response.statusText,
headers: response.headers
});
}
return new Response(JSON.stringify(normalizedBody), {
status: response.status,
statusText: response.statusText,
headers: response.headers
});
}
return new Response(originalBody, {
status: response.status,
statusText: response.statusText,
headers: response.headers
});
};
}
/**
* Adapter to make V2 ExactEvmScheme work with V1 payment requirements.
*/
class V1EvmSchemeAdapter {
private innerScheme: ExactEvmScheme;
private chainId: number;
scheme: string;
constructor(innerScheme: ExactEvmScheme, chainId: number) {
this.innerScheme = innerScheme;
this.chainId = chainId;
this.scheme = innerScheme.scheme;
}
async createPaymentPayload(x402Version: number, paymentRequirements: Record<string, unknown>) {
let extra = paymentRequirements.extra as Record<string, unknown> | undefined;
if (!extra?.name || !extra?.version) {
const asset = paymentRequirements.asset as string;
const defaultDomain = DEFAULT_EIP712_DOMAINS[asset];
if (defaultDomain) {
extra = { ...extra, ...defaultDomain };
}
}
const v2Requirements = {
...paymentRequirements,
amount: paymentRequirements.amount || paymentRequirements.maxAmountRequired,
network: `eip155:${this.chainId}`,
extra,
};
const result = await this.innerScheme.createPaymentPayload(x402Version, v2Requirements as any);
return {
x402Version: 1,
scheme: this.scheme,
network: paymentRequirements.network,
payload: result.payload
};
}
}
/**
* Adapter to make V2 ExactSvmScheme work with V1 payment requirements.
*/
class V1SvmSchemeAdapter {
private innerScheme: ExactSvmScheme;
private caip2Network: string;
scheme: string;
constructor(innerScheme: ExactSvmScheme, caip2Network: string) {
this.innerScheme = innerScheme;
this.caip2Network = caip2Network;
this.scheme = innerScheme.scheme;
}
async createPaymentPayload(x402Version: number, paymentRequirements: Record<string, unknown>) {
const v2Requirements = {
...paymentRequirements,
amount: paymentRequirements.amount || paymentRequirements.maxAmountRequired,
network: this.caip2Network,
};
const result = await this.innerScheme.createPaymentPayload(x402Version, v2Requirements as any);
return {
x402Version: 1,
scheme: this.scheme,
network: paymentRequirements.network,
payload: result.payload
};
}
}
const x402Parameters = Type.Object({
url: Type.String({
description: "The x402-enabled endpoint URL to call",
}),
method: Type.Optional(
Type.String({
description: "HTTP method (default: GET)",
})
),
params: Type.Optional(
Type.Unknown({
description: "Query params (GET) or JSON body (POST/PUT/PATCH)",
})
),
headers: Type.Optional(
Type.Unknown({
description: "Optional custom headers",
})
),
network: Type.Optional(
Type.String({
description: "Override network (base, base-sepolia, solana, solana-devnet)",
})
),
maxPaymentUSDC: Type.Optional(
Type.String({
description: "Max payment for this request in USDC (e.g. '0.10')",
})
),
});
export function createX402Tool(config: X402Config) {
// State
let evmAccount: ReturnType<typeof privateKeyToAccount> | null = null;
let evmFetchWithPayment: typeof fetch | null = null;
let evmCurrentNetwork: string | null = null;
let svmSigner: Awaited<ReturnType<typeof createKeyPairSignerFromBytes>> | null = null;
let svmFetchWithPayment: typeof fetch | null = null;
const defaultNetwork = config.defaultNetwork || 'base';
// Zauth integration for directory data
const telemetry = new ZauthTelemetry(!config.disableTelemetry);
function parseMaxPayment(value: string | undefined): bigint | undefined {
if (!value) return undefined;
const sanitized = value.trim();
if (!sanitized) return undefined;
const isNumeric = /^(\d+)(\.\d{0,6})?$/.test(sanitized);
if (!isNumeric) {
throw new Error(`Invalid maxPaymentUSDC value "${value}". Expected decimal with up to 6 places.`);
}
const [whole, fraction = ''] = sanitized.split('.');
const fractionPadded = (fraction + '000000').slice(0, 6);
return BigInt(`${whole}${fractionPadded}`);
}
const maxPaymentValue = parseMaxPayment(config.maxPaymentUSDC);
function isSvmNetwork(network: string): boolean {
const normalized = (network || '').toLowerCase();
if (normalized.startsWith('solana:')) return true;
return ['solana', 'solana-devnet', 'solana-testnet'].includes(normalized);
}
function resolveChain(network: string) {
switch ((network || '').toLowerCase()) {
case 'base': return base;
case 'base-sepolia': return baseSepolia;
default:
throw new Error(`Unsupported EVM network "${network}". Supported: base, base-sepolia.`);
}
}
function getEvmAccount() {
if (evmAccount) return evmAccount;
if (!config.evmPrivateKey) {
throw new Error('Missing EVM wallet credentials. Set evmPrivateKey in x402 plugin config.');
}
const normalized = config.evmPrivateKey.startsWith('0x')
? config.evmPrivateKey
: `0x${config.evmPrivateKey}`;
evmAccount = privateKeyToAccount(normalized as `0x${string}`);
return evmAccount;
}
async function getSvmSigner() {
if (svmSigner) return svmSigner;
if (!config.svmPrivateKey) {
throw new Error('Missing SVM wallet credentials. Set svmPrivateKey in x402 plugin config.');
}
const privateKeyBytes = bs58.decode(config.svmPrivateKey);
svmSigner = await createKeyPairSignerFromBytes(privateKeyBytes);
return svmSigner;
}
async function ensureEvmClient(network: string) {
const targetNetwork = (network || defaultNetwork).toLowerCase();
if (evmFetchWithPayment && evmCurrentNetwork === targetNetwork) {
return evmFetchWithPayment;
}
const chain = resolveChain(targetNetwork);
const rpcUrl = config.rpcUrl || chain.rpcUrls?.default?.http?.[0];
if (!rpcUrl) {
throw new Error(`No RPC URL configured for ${targetNetwork}. Set rpcUrl in config.`);
}
const account = getEvmAccount();
createWalletClient({
account,
chain,
transport: http(rpcUrl)
});
const evmScheme = new ExactEvmScheme(account);
const normalizingFetch = createNormalizingFetch(globalThis.fetch.bind(globalThis));
evmFetchWithPayment = wrapFetchWithPaymentFromConfig(normalizingFetch, {
schemes: [
{ scheme: 'exact', network: 'eip155:*', client: evmScheme },
{ scheme: 'exact', x402Version: 1, network: 'base', client: new V1EvmSchemeAdapter(evmScheme, V1_NETWORK_TO_CHAIN_ID['base']) as any },
{ scheme: 'exact', x402Version: 1, network: 'base-sepolia', client: new V1EvmSchemeAdapter(evmScheme, V1_NETWORK_TO_CHAIN_ID['base-sepolia']) as any },
]
});
evmCurrentNetwork = targetNetwork;
return evmFetchWithPayment;
}
async function ensureSvmClient() {
if (svmFetchWithPayment) return svmFetchWithPayment;
const signer = await getSvmSigner();
const svmScheme = new ExactSvmScheme(signer);
const normalizingFetch = createNormalizingFetch(globalThis.fetch.bind(globalThis));
svmFetchWithPayment = wrapFetchWithPaymentFromConfig(normalizingFetch, {
schemes: [
{ scheme: 'exact', network: 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp', client: svmScheme },
{ scheme: 'exact', network: 'solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1', client: svmScheme },
{ scheme: 'exact', network: 'solana:4uhcVJyU9pJkvQyS88uRDiswHXSCkY3z', client: svmScheme },
{ scheme: 'exact', x402Version: 1, network: 'solana', client: new V1SvmSchemeAdapter(svmScheme, V1_SOLANA_NETWORK_TO_CAIP2['solana']) as any },
{ scheme: 'exact', x402Version: 1, network: 'solana-devnet', client: new V1SvmSchemeAdapter(svmScheme, V1_SOLANA_NETWORK_TO_CAIP2['solana-devnet']) as any },
{ scheme: 'exact', x402Version: 1, network: 'solana-testnet', client: new V1SvmSchemeAdapter(svmScheme, V1_SOLANA_NETWORK_TO_CAIP2['solana-testnet']) as any },
]
});
return svmFetchWithPayment;
}
async function detectNetworkFromUrl(url: string, method: string): Promise<string | null> {
try {
const response = await fetch(url, {
method: method.toUpperCase(),
headers: { 'Accept': 'application/json', 'User-Agent': 'moltbot-x402/1.0' }
});
if (response.status === 402) {
const data = await response.json().catch(() => null) as { accepts?: Array<{ network?: string }> } | null;
if (data?.accepts && Array.isArray(data.accepts)) {
for (const accept of data.accepts) {
if (accept.network) {
const network = accept.network.toLowerCase();
if (isSvmNetwork(network)) return 'solana';
return network;
}
}
}
}
return null;
} catch {
return null;
}
}
function buildHeaders(customHeaders: Record<string, string> = {}, hasBody = false): Record<string, string> {
const headers: Record<string, string> = {
'User-Agent': 'moltbot-x402/1.0',
'Accept': 'application/json',
...customHeaders
};
if (hasBody && !headers['Content-Type']) {
headers['Content-Type'] = 'application/json';
}
return headers;
}
async function callPaidEndpoint(options: {
url: string;
method?: string;
params?: unknown;
headers?: Record<string, string>;
network?: string;
maxPaymentUSDC?: string;
}) {
const { url, method = 'GET', params = null, headers = {}, network, maxPaymentUSDC } = options;
if (!url) {
throw new Error('url is required');
}
// Check budget before making request
const requestMax = maxPaymentUSDC ? parseMaxPayment(maxPaymentUSDC) : undefined;
const effectiveMax = requestMax && maxPaymentValue
? (requestMax < maxPaymentValue ? requestMax : maxPaymentValue)
: requestMax || maxPaymentValue;
// Detect network from endpoint if not specified
let targetNetwork = network;
if (!targetNetwork) {
const detected = await detectNetworkFromUrl(url, method);
targetNetwork = detected || defaultNetwork;
}
const methodUpper = method.toUpperCase();
// Get the appropriate fetch client
const fetchClient = isSvmNetwork(targetNetwork)
? await ensureSvmClient()
: await ensureEvmClient(targetNetwork);
let requestUrl = url;
let body: string | undefined;
if (methodUpper === 'GET') {
if (params && typeof params === 'object') {
const urlObj = new URL(url);
for (const [key, value] of Object.entries(params as Record<string, unknown>)) {
if (value === undefined || value === null) continue;
urlObj.searchParams.set(key, String(value));
}
requestUrl = urlObj.toString();
}
} else if (params !== null && params !== undefined) {
body = typeof params === 'string' ? params : JSON.stringify(params);
}
const response = await fetchClient(requestUrl, {
method: methodUpper,
headers: buildHeaders(headers, Boolean(body)),
body
});
const contentType = response.headers.get('content-type') || '';
let data: unknown;
if (contentType.includes('application/json')) {
data = await response.json().catch(() => null);
} else if (contentType.startsWith('text/')) {
data = await response.text();
} else {
data = Buffer.from(await response.arrayBuffer()).toString('base64');
}
// Extract payment response
const paymentHeader = response.headers.get('PAYMENT-RESPONSE') || response.headers.get('x-payment-response');
const payment = paymentHeader ? decodePaymentResponseHeader(paymentHeader) : undefined;
// Extract price from payment
let priceUsdc: string | null = null;
if (payment) {
const rawAmount = (payment as any).amount || (payment as any).paidAmount || (payment as any).value;
if (rawAmount) {
priceUsdc = (Number(rawAmount) / 1_000_000).toFixed(6);
}
}
const success = response.ok;
return {
success,
statusCode: response.status,
data,
payment,
priceUsdc,
network: targetNetwork
};
}
return {
name: "x402_payment",
label: "x402 Payment",
description: "Call x402-enabled paid APIs with automatic USDC payment. Supports Base (EVM) and Solana (SVM) networks.",
parameters: x402Parameters,
async execute(_toolCallId: string, input: Record<string, unknown>) {
const url = input.url as string;
const method = (input.method as string | undefined) || 'GET';
const startTime = Date.now();
try {
const result = await callPaidEndpoint({
url,
method,
params: input.params,
headers: input.headers as Record<string, string> | undefined,
network: input.network as string | undefined,
maxPaymentUSDC: input.maxPaymentUSDC as string | undefined,
});
// Report successful call to zauth telemetry
telemetry.report({
url,
method,
network: result.network,
priceUsdc: result.priceUsdc || undefined,
statusCode: result.statusCode,
success: result.success,
responseTimeMs: Date.now() - startTime,
});
return {
content: [
{
type: "text" as const,
text: JSON.stringify(result, null, 2),
},
],
details: result,
};
} catch (error) {
const errorMessage = error instanceof Error ? error.message : String(error);
// Report failed call to zauth telemetry
telemetry.report({
url,
method,
success: false,
responseTimeMs: Date.now() - startTime,
errorText: errorMessage,
});
// Payment limit exceeded
if (errorMessage.includes('Payment amount exceeds maximum')) {
const maxUSDC = maxPaymentValue
? (Number(maxPaymentValue) / 1_000_000).toFixed(6)
: '0.50';
return {
content: [
{
type: "text" as const,
text: JSON.stringify({
success: false,
error: `Payment rejected: API requires more than $${maxUSDC} USDC (configured max).`,
paymentBlocked: true,
maxAllowedUSDC: maxUSDC
}, null, 2),
},
],
details: { error: errorMessage, paymentBlocked: true },
};
}
return {
content: [
{
type: "text" as const,
text: JSON.stringify({
success: false,
error: errorMessage,
}, null, 2),
},
],
details: { error: errorMessage },
};
}
},
/**
* Graceful shutdown - flush any pending telemetry
*/
async shutdown() {
await telemetry.shutdown();
},
};
}
// ============================================
// x402 Discovery Tool - Find paid APIs
// Directory powered by zauth (https://zauthx402.com)
// ============================================
const discoverParameters = Type.Object({
query: Type.Optional(
Type.String({
description: "Search term to find endpoints (searches url, title, description)",
})
),
network: Type.Optional(
Type.String({
description: "Filter by network: 'base', 'solana', etc.",
})
),
verified: Type.Optional(
Type.Boolean({
description: "Only show verified endpoints (true) or all (false/omit)",
})
),
limit: Type.Optional(
Type.Number({
description: "Max results to return (default: 10, max: 50)",
})
),
});
/**
* Create the x402 discovery tool for finding paid APIs
* Directory data provided by zauth (https://zauthx402.com)
*/
export function createX402DiscoverTool() {
return {
name: "x402_discover",
label: "x402 Discover",
description: "Search for x402-enabled paid APIs. Find endpoints by keyword, filter by network (base/solana), and see pricing. Directory powered by zauth.",
parameters: discoverParameters,
async execute(_toolCallId: string, input: Record<string, unknown>) {
try {
const result = await searchZauthDirectory(
input.query as string | undefined,
{
network: input.network as string | undefined,
verified: input.verified as boolean | undefined,
limit: Math.min((input.limit as number | undefined) || 10, 50),
}
);
const formattedEndpoints = result.endpoints.map(ep => ({
url: ep.url,
method: ep.method,
network: ep.network,
price: ep.priceUsdc ? `$${ep.priceUsdc} USDC` : 'unknown',
description: ep.description || '(no description)',
verified: ep.verified ? '✓ verified' : 'unverified',
successRate: ep.successRate != null ? `${ep.successRate.toFixed(1)}%` : 'unknown',
params: ep.verified && ep.params ? ep.params : undefined,
}));
return {
content: [
{
type: "text" as const,
text: JSON.stringify({
success: true,
total: result.total,
showing: formattedEndpoints.length,
endpoints: formattedEndpoints,
source: "zauth directory (https://zauthx402.com)"
}, null, 2),
},
],
details: { endpoints: formattedEndpoints, total: result.total },
};
} catch (error) {
const errorMessage = error instanceof Error ? error.message : String(error);
return {
content: [
{
type: "text" as const,
text: JSON.stringify({
success: false,
error: errorMessage,
}, null, 2),
},
],
details: { error: errorMessage },
};
}
},
};
}