Control how your AI agents spend
The smart proxy layer for x402 — policy-based budget management, data-driven API curation, and intelligent caching in one solution.
$ curl -X POST https://api.pag0.ai/v1/proxy
→ Policy check: ✓ within budget
→ Cache check: HIT (saved $0.05)
→ Response: 200 OK (12ms)
{
"cached": true,
"savings": "$0.05",
"latency": "12ms"
}
The Problem
x402 solved payments. Not spending.
AI agents can now pay for APIs automatically. But who controls how much they spend, what they buy, and whether they're wasting money?
Overspending Risk
Agents with no budget limits can go rogue. A single bug can burn hundreds of dollars in minutes — and x402 has no built-in spending controls.
No Selection Criteria
Hundreds of APIs in the x402 Bazaar, but no real usage data to compare them. Developers pick APIs based on marketing, not evidence.
Duplicate Payment Waste
Same request, same response — but you pay every time. Without caching, agents waste budget on redundant API calls.
The Solution
3-in-1 smart proxy layer
Pag0 sits between your AI agent and x402 APIs — controlling spend, curating choices, and caching responses in a single middleware.
Spend Firewall
Set per-request, daily, and monthly budget limits. Whitelist or blacklist endpoints. Approve or block spending automatically with policy rules.
API Curation
Score and rank APIs using real usage data — cost, latency, reliability, and success rate. Get recommendations backed by evidence, not marketing.
Smart Cache
Identical requests are served from cache — no payment required. Redis-based caching with configurable TTL delivers 40%+ cost savings.
How It Works
One proxy, full control
Pag0 intercepts x402 requests, enforces policies, caches responses, and collects analytics — all without touching payments.
AI Agent
Agent calls API through Pag0 proxy instead of directly
Pag0 Proxy
Cache check, policy enforcement, and analytics collection
x402 Server
API call + payment via x402 protocol if needed
AI Agent
Agent calls API through Pag0 proxy instead of directly
Pag0 Proxy
Cache check, policy enforcement, and analytics collection
x402 Server
API call + payment via x402 protocol if needed
Security: The proxy never signs payments. It only relays payment payloads signed by the agent's own wallet.
Features
Built for the x402 ecosystem
Multi-Chain Support
Deployed on Base Sepolia and BSC Testnet. Ready for multi-chain x402 payments.
ERC-8004 Audit Trail
On-chain payment proof recording via ReputationRegistry. Trustless, verifiable history.
16 MCP Tools
Full MCP server for AI agent integration — proxy, wallet, policy, curation, and analytics.
Real-Time Dashboard
Monitor requests, cache hit rates, cost savings, and API scores — all in real time.
CDP Wallet
Coinbase Developer Platform wallet for automated 402 → sign → retry payment flows.
Policy Engine
Configurable budget rules, whitelist/blacklist, approval workflows, and anomaly detection.
Dashboard
See everything at a glance
Real-time analytics, API rankings, cost savings, and policy management — all from a single dashboard.
Total Requests
12,847
Cache Hit Rate
67.3%
Total Savings
$234.50
Active Policies
8
Start protecting your AI agent's spending
Set up Pag0 in minutes. No code changes to your agent required — just point your requests through our proxy.
Open Dashboard