Software that pays for itself,
a sip at a time.

The model

The Wise of agent payments.

Wise hid wire transfers behind a clean interface; Wiz did the same for cloud security. Sippar does it for agent payments. Underneath, funds move across a dozen networks, signed by keys split across 34 independent operators and never assembled in one place. On top, your agent makes one call and gets one receipt. The chains and the cryptography are ours to handle, not yours to learn.

Multi-chain x402

Supported chains.

Code samples

Three lines of HTTP, one signed transfer.

// Base (EVM) - USDC payment to an x402 service
import { createWalletClient, http } from 'viem';
import { base } from 'viem/chains';

async function payX402OnBase(serviceUrl: string) {
  // 1. Request - server replies 402 with payment requirements
  const r1 = await fetch(serviceUrl, { method: 'POST' });
  if (r1.status !== 402) return r1.json();

  const req = JSON.parse(atob(r1.headers.get('PAYMENT-REQUIRED')!));

  // 2. Sign + send USDC on Base
  const wallet = createWalletClient({ chain: base, transport: http() });
  const hash = await wallet.writeContract({
    address: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', // Base USDC
    abi: [{ name: 'transfer', type: 'function',
      inputs: [{ name: 'to', type: 'address' }, { name: 'amount', type: 'uint256' }],
      outputs: [{ type: 'bool' }] }],
    functionName: 'transfer',
    args: [req.payToAddress, BigInt(req.maxAmountRequired * 1e6)]
  });

  // 3. Retry with X-PAYMENT proof
  return (await fetch(serviceUrl, {
    method: 'POST',
    headers: { 'X-PAYMENT': hash }
  })).json();
}

Cross-chain relay

Pay one chain. Reach any other.

No bridging, no wrapped tokens. Sippar holds liquidity treasuries on every chain. Agent pays its home chain in 8 seconds; Sippar settles to the destination from its native wallet.

Source chains: Base, Arbitrum, Optimism, Polygon, BNB, Celo, Solana, Stellar, Ethereum, Algorand, TON, plus Tempo via MPP. Destination chains: any of the above.

Agency API

Pay-to-automate triggers.

Register triggers that execute actions when verified Algorand payments arrive. Perfect for autonomous agents that schedule actions on payment.

MCP tools

25 tools across 5 domains.

Drop-in tools for Claude Code and any MCP-speaking agent. Algorand, Solana, Stellar, Agency, and Lava - full catalog at the manifest endpoints.