Overview

Everything you need to know before making your first API call.

sms4sats is a pay-per-use SMS service backed by Bitcoin Lightning Network. There are no accounts required — just generate an order, pay the Lightning invoice, and receive your SMS activation code.

How It Works

1. Create an order with your desired country and service (e.g. USA + Google).

2. Pay the Lightning invoice returned by the API using any Lightning wallet.

3. Poll the order status endpoint until your activation code arrives.

4. Cancel anytime after 2 minutes if no code has arrived — your payment is automatically returned.

sms4sats uses hold invoices. Your funds are only settled when an activation code is successfully delivered. If no code arrives within 21 minutes, the invoice is automatically canceled and funds returned.

Payment Options

Method	Details
Bitcoin Lightning	Native payment method. Instant, no fees, no account.
USDT / LTC / ETH	Swap to Lightning BTC via FixedFloat.

Prepaid Account (API Key)

For automated or high-volume usage, you can fund a prepaid account with an API Key to skip the per-order invoice payment step. See Fund Account and Get Balance.

L402 / AI Agents

AI agents can use https://api.sms4sats.com/skill.md to operate the service autonomously via the L402 protocol with no human intervention.