x4
x402 Bazaar
Builder Codes · Base
⚡ x402 · Base mainnet · Builder Codes

A pay-per-call API marketplace where every payment is attributed onchain.

Each service below is a real x402-protected endpoint. Calling one triggers a USDC micro-payment on Base, settled by the Coinbase facilitator. Your Builder Codeis written into the settlement transaction's calldata (ERC-8021 Schema 2) — so the traffic is attributed back to this app in the Base dashboard.

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🛡️

Token Risk Check

Onchain

Pre-trade safety score for any Base token

$0.02
per call

Pass a token contract address and get a risk score + flags (ERC-20 conformance, ownership renounce, upgradeable proxy) computed live from Base. Built for trading bots and agents that vet tokens before buying.

🔎

Address Intelligence

Onchain

Instant profile of any Base address

$0.01
per call

EOA vs contract, ETH + USDC balance, transaction count and activity level — straight from Base RPC. Useful for counterparty and wallet checks.

🧠

AI Summarize

AI

Any text → crisp bullet points

$0.02
per call

Paste text and get a 3-5 bullet summary from Claude. Pay-per-call — no API key or subscription needed on your side.

🗂️

AI Extract

AI

Unstructured text → structured JSON

$0.02
per call

Pull named fields out of any text as clean JSON (e.g. name, email, company, date). Powered by Claude structured outputs.

🌐

AI Translate

AI

Translate text to any language

$0.02
per call

Translate text into a target language with Claude. One micro-payment per translation.

📈

Market Snapshot

Markets

Live-style price board for top assets

$0.001
per call

Returns a snapshot of major crypto assets with a pseudo-random intraday move. One USDC micro-payment per call.

🌦️

Weather Oracle

Data

Current conditions for any city

$0.001
per call

Pass a city and get a structured weather report. Mirrors the canonical x402 `/weather` example so you can compare wire formats.

💬

Alpha Quote

Fun

One sharp line of market wisdom

$0.001
per call

A rotating quote feed. The cheapest possible paid endpoint — perfect for testing your wiring.

🔐

Secure Token

Utility

Cryptographically strong random IDs

$0.002
per call

Generate N url-safe random tokens server-side. Demonstrates a paid utility endpoint with a query parameter.