txn.dev is a payment protocol built for autonomous AI agents. It provides wallets, instant transfers, and Stripe-based funding so agents can hire each other and exchange value programmatically.

How fast are agent-to-agent transfers?

Transfers between agent wallets settle in approximately 4 milliseconds on the internal ledger. There is no batching, no clearing house, and no waiting period.

What is the minimum transfer amount?

txn.dev supports sub-cent micropayments with up to 8 decimal places of precision. You can transfer amounts as small as $0.00000001, making it suitable for per-word, per-token, or per-API-call pricing.

How much does txn.dev cost?

txn.dev charges 2.5% per transfer. There are no monthly fees, no minimums, and no setup costs. Funding wallets and withdrawals are free. You only pay when your agents transact.

How do I integrate txn.dev with my AI agents?

txn.dev offers three integration paths: a TypeScript SDK (@txn-dev/sdk) for direct API access, an MCP server (@txn-dev/mcp-server) for Claude Desktop, Cursor, and Windsurf, and a LangChain toolkit (@txn-dev/langchain) for LangChain/LangGraph agents. All are available on npm.

How do agents get funded with real money?

Agent wallets are funded via Stripe checkout. You can deposit USD, EUR, or GBP using cards, bank transfers, or ACH. Funds land in the agent wallet instantly after Stripe confirms payment. Organizations can withdraw agent earnings via Stripe Connect payouts.

Are transfers idempotent?

Yes. Every transfer accepts an idempotency key. If an agent retries a payment with the same key, the original transaction is returned. This prevents double-charges on unreliable networks.

What currencies does txn.dev support?

txn.dev supports USD, EUR, and GBP. Agent wallets are denominated in a single currency, and transfers happen between wallets of the same currency.

Now in public beta

txn.dev

The payment protocol for AI agents.

agent.ts

$ npm install @txn-dev/sdk

import { Txn } from "@txn-dev/sdk"

const txn = new Txn("txn_live_...")

await txn.pay({
  from:   "wallet_sender",
  to:     "wallet_receiver",
  amount: 0.003,
  memo:   "translated 340 words en>fr"
})

Get started Documentation

How it works

Three layers. Fiat in, agents transact, fiat out.

Fund wallet via Stripe

Deposit USD into any agent wallet using Stripe. Cards, bank transfers, or ACH. Funds land instantly.

Agents transact on ledger

Agents pay each other on a high-speed internal ledger. Millisecond settlement, sub-cent precision, zero fees between wallets.

Withdraw to bank

Pull funds back out via Stripe Connect payouts. Agent earnings settle to your bank account on schedule.

System Architecture

STRIPE

Fiat on-ramp

USD in

WALLET

Agent A

$2,450.00

LEDGER

txn.dev core

~4ms

WALLET

Agent B

$890.50

PAYOUT

Stripe Connect

USD out

STRIPE

Fiat on-ramp

WALLET

Agent A

LEDGER

txn.dev core

WALLET

Agent B

PAYOUT

Stripe Connect

Double-entry audit trail

Every transaction is a debit and a credit. Full history, always balanced.

Idempotent

Atomic

Immutable

Built for agents

Everything your agents need to transact at scale

Sub-cent micropayments

Pay $0.001 per API call. Micropayments that actually work, down to fractions of a cent. No minimums, no batching.

transfer$0.003

transfer$0.0007

transfer$0.015

transfer$0.001

transfer$0.0042

transfer$0.009

transfer$0.0001

transfer$0.022

Instant settlement

Agent-to-agent transfers settle in single-digit milliseconds. No batching, no waiting, no clearing house.

~0ms

average settlement time

Idempotent transfers

Every transfer accepts an idempotency key. Safe retries, no double-charges, built for unreliable networks.

POST/pay201

POST/paysame key200

charged once, returned three times

Simple SDK

A clean API that does what you expect. Install, init, transact. No config files, no ceremony.

agent.ts

config.ts

import { Txn } from "@txn-dev/sdk"

const txn = new Txn("txn_live_...")

// Create a wallet
const wallet = await txn.wallets.create({
  name: "translator"
})

// Pay another agent
await txn.transfers.create({
  from: wallet.id,
  to:   "wallet_b",
  amount: 0.003
})

Three lines to production

A clean SDK that does what you expect. No config files, no ceremony.

import { Txn } from "@txn-dev/sdk"
 
const txn = new Txn("txn_live_...")
 
const wallet = await txn.wallets.create({
  name: "translation-agent",
  currency: "usd",
  metadata: {
    agent: "translator-v2",
    owner: "org_acme"
  }
})
 
// wallet.id -> "wallet_a1b2c3d4"

Simple pricing

2.5%per transfer

No monthly fees. No minimums. No setup costs. You only pay when your agents transact. Funding and withdrawals are free.

Start building