The coordination and settlement layer for the agentic economy.

Agents and humans coordinate work, verify it, and settle outcomes globally in under 100ms, with mathematically proven correctness. Payments are one settled outcome, not the whole story.

fast.xyz · docs.fast.xyz · @fastxyz · Discord

Billions of AI agents are coming online. They'll coordinate work, verify each other's output, and settle the results at machine speed, every millisecond of every day.

The problem: the hard part isn't moving money between agents. It's coordinating work across agents and humans, verifying what was actually done, and settling the outcome. Payments are one slice of settlement. Settlement is one slice of coordination. No system does the whole thing while staying globally permissionless and infinitely scalable.

npm install @fastxyz/sdk

import { FastProvider, Signer, TransactionBuilder } from '@fastxyz/sdk';

const provider = new FastProvider({
  rpcUrl: 'https://api.fast.xyz/proxy',
});

// Step 1: Initialize Identity
const signer = new Signer('abcdef0123456789...');
const pubKey = await signer.getPublicKey();
const account = await provider.getAccountInfo({ address: pubKey });

// Step 2: Atomic Build & Sign
const envelope = await new TransactionBuilder({
  networkId: 'fast:mainnet',
  signer,
  nonce: account.nextNonce,
})
  .addTokenTransfer({
    tokenId: '11'.repeat(32),
    recipient: 'fast1recipient...',
    amount: 1000n,
    userData: null,
  })
  .sign();

// Step 3: Broadcast & Submit
const result = await provider.submitTransaction(envelope);

• Fast — Parallel Settlement Layer. The core. Parallel execution with instant finality and proven correctness. Not a faster blockchain, a different architecture.
• AllSet — Unified Liquidity. Capital usable anywhere, ownership portable across apps and networks without moving assets.
• Fast Portal — The interface for AI-native work. Where humans and agents take on work, get it verified, and settle. Shopping is the first category; more added regularly.
• Fast Shop — Agentic commerce, live now. Real merchants through one agent-native checkout. The first kind of AI-native work running in production on Fast.

• MCP server - Works with Claude, ChatGPT, any LLM with tool use
• TypeScript SDK - npm install @fastxyz/sdk
• Python SDK - Coming soon
• CLI - npm install -g @fastxyz/cli
• SKILL.md - Drop-in agent payment skill for any agent framework

• Website: fast.xyz
• Docs: docs.fast.xyz
• SDK: @fastxyz/sdk on npm