Quick start
Five lines to a working agent payment.
Install the SDK, drop in your API key, send a payment. Same call works against the mock provider in tests and the live providers in production.
import { Arispay } from '@arispay/sdk';
const arispay = new Arispay({ apiKey: process.env.ARISPAY_API_KEY });
const payment = await arispay.payments.create({
amount: 99.99,
currency: 'USD',
rail: 'card',
agentId: 'agent_123',
});Two SDKs. One platform.
For agent builders
PayAgent
Agent-side x402 SDK. Wrap any fetch call with payFetchDelegated() and pay HTTP 402 challenges automatically. Vercel AI SDK + LangChain adapters included.
Built like you'd build it.
The boring stuff is done. Spend the time on the agent, not the payments plumbing.
Idempotent by default
Every POST takes an Idempotency-Key. Retry as much as your network does. We dedupe on the server.
HMAC-signed webhooks
Every webhook carries an HMAC-SHA256 signature plus replay-protected timestamp. Verify in one helper call.
Delegated custody
x402 signing runs through Coinbase CDP. The key never touches your servers. Spend caps enforced before the signature.
Five rails, one schema
Card, ACH, SEPA, x402, and USDC respond with the same Payment shape. Switch rails by changing one field.
Mock + live providers
PAYMENT_PROVIDER=mock for tests, PAYMENT_PROVIDER=fiserv for prod. Same SDK, same response shape.
Stable error codes
Errors are strings, not HTTP statuses. SPEND_LIMIT_EXCEEDED, X402_PAYMENT_FAILED, CARD_DECLINED. Switch on them.