Open-source financial governance for autonomous agents making x402 payments. Policy engine, audit trail, and circuit breakers — so your agents spend smart.
Paybound sits between your AI agents and the payment facilitator, enforcing policies before money moves.
Per-agent budgets, per-transaction limits, time-windowed spending caps, and allowlists. Define rules in YAML, enforce them at the proxy.
Full audit trail with cost attribution. Every payment attempt is logged — approved or denied — with the policy decision and reasoning.
Transparent interception of x402 payment flows. Drop-in replacement that agents use without code changes. Forwards to any upstream facilitator.
Automatic spend freezes when anomalies are detected. Rolling windows catch runaway agents before they drain your budget.
A pass-through proxy with a policy engine and a SQLite ledger. Paybound never touches, holds, or redirects funds.
Drop in the SDK, point your agents at the proxy, define policies in YAML. That's it.
import { PayboundClient } from '@paybound/sdk'; // Point your agent at the Paybound proxy const client = new PayboundClient({ proxyUrl: 'http://localhost:4020', agentId: 'research-bot-1', }); // Make x402 payments — Paybound enforces your policies const response = await client.fetch( 'https://api.example.com/data', { method: 'GET' } ); // ✅ Approved: under budget, within limits // ❌ Denied: over budget → logged + blocked
These aren't just design choices — they're hard constraints.
Paybound never holds, escrows, or controls money. All settlement flows through the upstream facilitator.
Payment destinations are pass-through. Paybound can block a payment, but never change where it goes.
No token, no coin, no points. Paybound is governance infrastructure, not a financial product.
MIT licensed. Read every line. Self-host it. Fork it. The code is the trust layer.
Paybound is pre-alpha. We're looking for feedback from builders working with x402 and autonomous agents.