x402 Payment Guide

You hit a 402 Payment Required on minia2a.uk because your free trial quota (3 calls/endpoint) is exhausted. Here's how to pay and keep using the service.

What is x402?

x402 is the HTTP 402 Payment Required protocol for machine-to-machine micropayments. Your AI agent pays $0.005 USD (in USDC on Base) per API call — no signup, no KYC, no subscription. Pay per use.

How to Pay (3 Steps)

Step 1: Get USDC on Base (Coinbase, bridge, or DEX swap)

Step 2: Use an x402-compatible client or facilitator

Step 3: Send request with PAYMENT-SIGNATURE header

Option A: x402-fetch (Node.js — Easiest)

npm install x402-fetch

import { x402Fetch } from "x402-fetch";

const res = await x402Fetch("https://minia2a.uk/x402/recall?q=best%20agent%20marketplaces");
const data = await res.json();
// $0.005 USDC on Base — paid automatically

Option B: curl + PayAI Facilitator

# 1. Get the 402 challenge to see payment requirements
curl -s -D- https://minia2a.uk/x402/recall?q=test

# 2. The WWW-Authenticate header tells you amount + recipient
# 3. Sign an EIP-3009 permit for $0.005 USDC
# 4. Send the permit to PayAI for settlement
# 5. Resend your request with the PAYMENT-SIGNATURE header

Option C: KeeperHub MCP (Auto-Pay)

If you're using KeeperHub workflows, the keeperhub-wallet MCP auto-pays x402 fees from your KeeperHub MPC wallet. No manual signing needed.

Option D: Circle Gateway (Gas-Free, 11 Chains)

minia2a.uk supports Circle Gateway settlement — pay USDC from 11 chains without holding native gas tokens. Use /x402/circle/recall endpoint for gas-free settlement.

Price List

Endpoint	Price	Description
/x402/recall	$0.005	Curated agent-economy knowledge base
/x402/find	$0.005	Semantic search over 25,000+ x402 services
/x402/store	$0.005	Persistent memory-as-a-service
/x402/web-scrape	$0.005	Real Chromium browser rendering
/x402/agent-intel	$0.05	Survival intelligence for AI agents
/x402/dex-price	$0.01	Live DEX token prices
/x402/gas	$0.01	Multi-chain gas prices
/x402/polymarket	$0.01	Live Polymarket odds
/x402/contract-safety	$0.02	Quick EVM contract safety scan
/x402/keeperhub	$0.01	KeeperHub workflow discovery
/x402/validate	Free	Validate your own x402 endpoint

Free Services

These endpoints are always free (no x402 payment needed):

/svc/eth-block-number	Current Ethereum block number
/svc/eth-balance	ETH balance for any address
/svc/multi-balance	Multi-chain balance aggregation
/svc/gas	Current gas prices across chains
/svc/dex-price	DEX token prices via GeckoTerminal
/svc/polymarket	Polymarket market data
/x402/validate	x402 endpoint spec validator

minia2a.uk — agent-only marketplace. No humans, no KYC, no subscriptions. Pay per use.