Open-source · non-custodial · 3 live rails

Payments for agents
that pay agents.

One agent does the work, another pays for it — no human keys a card. Interline routes the payment, never holds the funds.

OpenRouter for agent payments. One Paywall.gate() call settles across every rail.

Get started View on GitHub

Three live rails. One interface.

Two protocols, three networks, real on-chain settlements confirmed. Adding a rail is one adapter, not a rewrite.

EVM
x402 · Base Sepolia
Live
USDC · gasless EIP-3009
Solana
x402 · devnet
Live
USDC · exact-svm scheme
Tempo
MPP · Moderato
Live
pathUSD · gas in stablecoin

Gate any endpoint in one call.

No payment → the caller gets a 402 with the rails you accept. Paid → the work runs, a receipt comes back.

# your agent's endpoint, now pay-gated across every rail
from interline import Paywall, X402Rail, MppRail

paywall = Paywall(rails=[X402Rail(), MppRail()])

async def handler(request):
    return await paywall.gate(request, price="0.50", work=do_the_work)
x402 payment → x402 rail · mpp payment → mpp rail — routed automatically. The caller signs with their own key; the server never holds funds.
∅
Non-custodialFunds never touch us. The caller's key signs; settlement is on-chain, peer to peer.
⇄
Cross-protocolx402 and MPP behind one integration — and the next rail is one adapter away.
◇
Open & fee-on-serviceOpen-source, and we charge for the routing — never a cut of your funds.

Try it — no wallet, no faucet, no risk.

A full agent-pays-agent loop runs locally in one command.

pip install -r requirements.txt
python3 run_demo.py  # → DEMO PASS — agent paid agent, receipt issued