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x402 v3.1: Add Bazaar discovery extensions for AI agent discoverability

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Integrates @x402/extensions/bazaar to enrich 402 responses with
machine-readable input/output schemas. AI agents can now auto-discover
API capabilities, parameter types, and descriptions from the payment
header alone.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
OpSpawn 2026-02-06 10:17:01 +00:00
parent da6dc035ed
commit 53c890c1f6
1 changed files with 52 additions and 6 deletions
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58
x402.js
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@ -3,6 +3,7 @@
const { x402HTTPResourceServer, x402ResourceServer, HTTPFacilitatorClient } = require('@x402/core/server');
const { ExactEvmScheme } = require('@x402/evm/exact/server');
const { declareDiscoveryExtension, bazaarResourceServerExtension } = require('@x402/extensions/bazaar');
const WALLET_ADDRESS = '0x7483a9F237cf8043704D6b17DA31c12BfFF860DD';
@ -38,8 +39,8 @@ class NodeHTTPAdapter {
let httpResourceServer = null;
let initialized = false;
function createRouteConfig(price, description, mimeType) {
return {
function createRouteConfig(price, description, mimeType, discoveryMeta) {
const config = {
accepts: {
scheme: 'exact',
network: NETWORK,
@ -50,6 +51,12 @@ function createRouteConfig(price, description, mimeType) {
description,
mimeType,
};
if (discoveryMeta) {
config.extensions = {
...declareDiscoveryExtension(discoveryMeta),
};
}
return config;
}
async function initX402() {
@ -59,29 +66,68 @@ async function initX402() {
const resourceServer = new x402ResourceServer([facilitator]);
resourceServer.register(NETWORK, new ExactEvmScheme());
resourceServer.registerExtension(bazaarResourceServerExtension);
const routes = {
'GET /api/capture': createRouteConfig(
PRICES.capture,
'Capture screenshot or PDF from a URL',
'image/png'
'image/png',
{
input: { url: 'https://example.com', format: 'png' },
inputSchema: {
properties: {
url: { type: 'string', description: 'URL to capture screenshot of' },
format: { type: 'string', description: 'Output format: png, jpeg, or pdf' },
width: { type: 'number', description: 'Viewport width in pixels (default 1280)' },
height: { type: 'number', description: 'Viewport height in pixels (default 800)' },
fullPage: { type: 'boolean', description: 'Capture full scrollable page' },
},
required: ['url'],
},
output: { example: 'Binary PNG/JPEG image or PDF document' },
}
),
'POST /api/md2pdf': createRouteConfig(
PRICES.md2pdf,
'Convert Markdown to PDF',
'application/pdf'
'application/pdf',
{
input: { markdown: '# Hello World\n\nSample markdown content' },
inputSchema: {
properties: {
markdown: { type: 'string', description: 'Markdown content to convert to PDF' },
theme: { type: 'string', description: 'Theme: light or dark (default light)' },
paperSize: { type: 'string', description: 'Paper size: A4, Letter, Legal, Tabloid' },
},
required: ['markdown'],
},
output: { example: 'Binary PDF document with styled markdown content' },
}
),
'POST /api/md2png': createRouteConfig(
PRICES.md2png,
'Convert Markdown to PNG image',
'image/png'
'image/png',
{
input: { markdown: '# Hello World\n\nSample markdown content' },
inputSchema: {
properties: {
markdown: { type: 'string', description: 'Markdown content to convert to image' },
theme: { type: 'string', description: 'Theme: light or dark (default light)' },
width: { type: 'number', description: 'Viewport width in pixels (default 800)' },
},
required: ['markdown'],
},
output: { example: 'Binary PNG image of rendered markdown' },
}
),
};
httpResourceServer = new x402HTTPResourceServer(resourceServer, routes);
await httpResourceServer.initialize();
initialized = true;
console.log('[x402] Micropayment system initialized (PayAI facilitator)');
console.log('[x402] Micropayment system initialized (PayAI facilitator + Bazaar discovery)');
console.log(`[x402] Accepting USDC on Base to ${WALLET_ADDRESS}`);
console.log(`[x402] Prices: capture=${PRICES.capture}, md2pdf=${PRICES.md2pdf}, md2png=${PRICES.md2png}`);
return httpResourceServer;