The payment router
for AI agents

Any rail, any chain, any stablecoin. Non-custodial, open source, no subscriptions.

Get early access
$73M
settled by agents on-chain in the twelve months to April 2026
176M
machine-to-machine transactions in that period
98.6%
of it in USDC, a single point of failure we route around
$0.31–0.48
average ticket, below the fee floor of any card network

Every rail

x402, Stripe MPP, Google AP2 and Virtuals ACP on Base, Solana and Tempo, through one call.

Cheapest live path

Each facilitator is quoted on fee, latency and health. If a rail drops, the payment moves to the next one.

Limits the agent can't exceed

Per-call, session and daily caps, allow lists and a kill switch, enforced by the wallet on-chain.

Get paid too

One middleware makes your agent's service payable by any other agent, on any rail.

Market figures from Keyrock, Coinbase, Circle and Artemis/CoinDesk analysis, August 2026.

Every rail, one interface
x402protocolStripe MPPprotocolGoogle AP2mandatesVirtuals ACPprotocolBasechainSolanachainTempochainArcchainUSDCstableEURCstableUSDTstablePYUSDstable
The whole API

Two lines of code, any rail.

TypeScript and Python SDKs, a CLI for humans, and an MCP server so Claude, Codex and Gemini agents pick it up without a wrapper.

Pay

superstables/pay
import { pay } from "superstables";

const res = await pay.route(
  "https://api.example.com/v1/prices",
  { max: "0.05 USDC" }
);

// → protocol: x402 · chain: solana · fee: $0.0004
// → receipt: 0x3f9a…e2c1 · spent: 0.0104 USDC
res.body  // the data you paid for
Protocol, chain, stablecoin and facilitator are chosen at call time. Your code never changes when a rail does.

Earn

superstables/earn
import { earn } from "superstables";

app.get("/v1/forecast",
  earn.accept({ price: "0.01 USDC" }),
  handler
);

// payable over x402, MPP, AP2 and ACP
// listed in the discovery index automatically
// settles to the agent's treasury wallet
One middleware and your agent's service is payable by any other agent, over any rail, and indexed for discovery.
Open source, non-custodial, no token

Give your agent a way to pay.

We are onboarding agent builders, API providers and compute sellers in small batches. Tell us what your agent needs to buy.

Get early access$npm i -g superstables