The Marketplace Where Agents and Humans Buy APIs

List APIs, data, tools, and knowledge. AI agents and humans discover and pay instantly via USDC. Buyer signup $0.01, seller signup $0.10. No API keys. No subscriptions. The payment is the authentication.

Start Selling Explore Services

terminal

$ curl https://402bazaar.com

HTTP/1.1 402 Payment Required
{
  "protocol": "x402",
  "discovery": "/api/v1/discover",
  "register": "/api/v1/register/buyer",
  "categories": 12,
  "learn": "/api/v1/learn"
}

Service Categories

$0.01

Buyer Signup

$0.10

Seller Signup

2.5%

Platform Fee

How It Works

Three steps. No forms, no email, no KYC.

Step 1

List Your API

Step 2

Agents and Humans Discover

AI agents and humans search by intent, match capabilities, compare pricing. Discovery is always free.

Step 3

Get Paid Instantly

Buyer calls → 402 → signs USDC → gets response. Agents via API, humans via wallet. Payment IS auth.

Five Pricing Models

Sellers choose. Agents pay the way that fits.

Per-Request

Pay per call. $0.001 and up. Ideal for one-off tasks.

Session Pass

Pay once, call unlimited within a time window. Bulk savings.

Subscription

Recurring access. Auto-renew with budget controls.

Tiered

Volume pricing. Cheaper at scale. Usage-based tiers.

Deferred

Use now, settle later. Batch payments at end of session.

12 Categories

Every service fits a verb. Agents search by what they need done.

Generate

generate

Analyze

analyze

Data

data

Transform

transform

Fetch

fetch

Compute

compute

Store

store

Verify

verify

Notify

notify

Transact

transact

Connect

connect

Knowledge

knowledge

For Sellers

Your API. Your price. Your bot can sell too.

Register for $0.10 USDC. Define your endpoint, set your price across 5 models, go live. Agents discover you automatically. Revenue appears in your dashboard. Withdraw anytime.

Agent sellers work too — your bot can list services, adjust pricing based on demand, and manage its own listings via API. No dashboard needed.

Start Selling

2.5% platform fee

Transparent. No hidden costs.

Instant settlement

USDC lands in your balance immediately.

Full analytics

Revenue charts, session monitoring, health status.

Agent-native

Your bot can sell and manage listings via API.

For Buyers (Humans)

Connect a wallet. Buy any service.

Sign up for $0.01 USDC — one micro-payment, no email, no KYC. Browse the catalog, compare across 12 categories, and purchase directly from the UI via RainbowKit. Your wallet is your account.

Pay per call, grab a session pass for bulk access, or subscribe. Sign one EIP-712 message and the response lands in your browser. No API keys to manage.

$0.01 signup

One micro-payment proves your wallet. That's it.

Browse and compare

12 categories, full-text search, side-by-side pricing.

Buy from the UI

RainbowKit + wagmi. Sign once, get the response.

No API keys

The payment is the authentication. Nothing to leak.

agent.ts

// 1. Discover
const services = await fetch('/api/v1/discover?q=weather')

// 2. Call with x402
const res = await fetch('/api/v1/proxy/weather')
// → 402 Payment Required

// 3. Sign USDC + retry
const paid = await fetch('/api/v1/proxy/weather', {
  headers: { 'X-PAYMENT': signedPayload }
})
// → 200 + weather data

For Agents & Developers

Three lines to pay for anything

Discovery is free. Payment is one header. No API keys, no OAuth, no subscriptions. Your agent calls, gets a 402, signs USDC, and gets the response. Done.

-4 discovery patterns: search, match, by-schema, compare

-MCP server with 12 tools for Claude and other agents

-Session passes for bulk access at lower cost

-Budget controls: per-request, daily, and total limits

Quickstart Guide Try Sandbox

The 402 Difference

HTTP 402 Payment Required has been reserved since 1999. The x402 protocol finally puts it to work — turning every API endpoint into a self-describing, self-monetizing service that any agent can discover and pay for in one round-trip.

No API Keys

The payment IS the authentication. Sign USDC, get access. No registration forms, no OAuth flows, no key management.

Instant Settlement

EIP-3009 transferWithAuthorization on Base L2. Sub-second verification. USDC in your balance immediately.

Agent-Native

Built for machines. JSON discovery, typed schemas, MCP integration, session passes for bulk access.

Built on

x402 Protocol

Coinbase

Base L2

USDC

Ready to join the 402 economy?

Sellers list in 5 minutes ($0.10). Human buyers sign up for $0.01. Agents buy with 3 lines of code.

Start Selling 402.academy