Generate QR / Aztec / Data Matrix / PDF417 codes from structured payloads (url, wifi, vcard, vevent, email, sms, tel, geo, bitcoin, json, text). QR supports rounded or dotted modules, solid colors or linear/radial gradients, transparent backgrounds, configurable error correction, and a centered logo image (URL or data URI).
/api/barcode/generatePAYMENT-SIGNATURE.The generate API is a pay-per-call barcode endpoint built for AI agents and autonomous software. Generate QR / Aztec / Data Matrix / PDF417 codes from structured payloads (url, wifi, vcard, vevent, email, sms, tel, geo, bitcoin, json, text).
There is no signup and no API key. An agent (or any HTTP client) hits the endpoint, receives an x402 "402 Payment Required" challenge, signs a sub-cent USDC payment on Base or Solana, and retries — the data comes back on the paid request. That makes it a drop-in generate data source for an agent tool-use loop, an MCP host, or a backend that needs barcode data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
format | string | one of: qr | aztec | datamatrix | pdf417 |
datarequired | ||
output | string | one of: svg | png | dataurl |
size | integer | min 64 · max 4096 |
margin | integer | min 0 · max 16 |
errorCorrection | string | L=~7%, M=~15%, Q=~25%, H=~30% recoverable damage (QR only). one of: L | M | Q | H |
style | object |
# 1. Probe the endpoint with no auth — receive 402 with PaymentRequirements
curl -sS -X POST 'https://2s.io/api/barcode/generate' \
-H 'Content-Type: application/json' \
-d '{"format":"qr","data":{"type":"text","text":"example"},"output":"svg","size":512,"margin":4,"errorCorrection":"M","style":{"modules":"square","foreground":"example","background":"example","logo":{"source":"example","sizePct":0.05,"padding":0,"background":"example","cornerRadius":0}}}'
# 2. Sign the EIP-3009 transferWithAuthorization for the advertised price +
# payTo from the 402 envelope, then retry with PAYMENT-SIGNATURE:
curl -sS -X POST 'https://2s.io/api/barcode/generate' \
-H 'Content-Type: application/json' \
-H 'PAYMENT-SIGNATURE: <base64-json-payload>' \
-d '{"format":"qr","data":{"type":"text","text":"example"},"output":"svg","size":512,"margin":4,"errorCorrection":"M","style":{"modules":"square","foreground":"example","background":"example","logo":{"source":"example","sizePct":0.05,"padding":0,"background":"example","cornerRadius":0}}}'
# Or just use the canonical runner — it handles the whole loop:
# EVM_PRIVATE_KEY=0x... node --env-file=.env.local \
# --experimental-strip-types scripts/x402-pay.ts \
# 'https://2s.io/api/barcode/generate'import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.barcode.generate({
"format": "qr",
"data": {
"type": "text",
"text": "example"
},
"output": "svg",
"size": 512,
"margin": 4,
"errorCorrection": "M",
"style": {
"modules": "square",
"foreground": "example",
"background": "example",
"logo": {
"source": "example",
"sizePct": 0.05,
"padding": 0,
"background": "example",
"cornerRadius": 0
}
}
})
console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)import os
from twosio import TwoS
client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])
result = client.barcode.generate(format="qr", data={"type":"text","text":"example"}, output="svg", size=512, margin=4, errorCorrection="M", style={"modules":"square","foreground":"example","background":"example","logo":{"source":"example","sizePct":0.05,"padding":0,"background":"example","cornerRadius":0}})
print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
// EVM_PRIVATE_KEY funds x402 payments per call.
// claude_desktop_config.json
{
"mcpServers": {
"2sio": {
"command": "npx",
"args": ["-y", "@2sio/mcp"],
"env": { "EVM_PRIVATE_KEY": "0x..." }
}
}
}
// 2. Once the server is running, agents call this tool via standard MCP:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "barcode.generate",
"arguments": {
"format": "qr",
"data": {
"type": "text",
"text": "example"
},
"output": "svg",
"size": 512,
"margin": 4,
"errorCorrection": "M",
"style": {
"modules": "square",
"foreground": "example",
"background": "example",
"logo": {
"source": "example",
"sizePct": 0.05,
"padding": 0,
"background": "example",
"cornerRadius": 0
}
}
}
}
}