barcode.generate

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).

price

$0.0010 USDC per call

method

POST/api/barcode/generate

payment

x402 v2 · EIP-3009 transferWithAuthorization · USDC on Base mainnet

auth

None. Sign the payment, retry with PAYMENT-SIGNATURE.

tier

Tier 0 — no paid upstream

Parameters

Name	Type	Description
`format`	string	one of: qr \| aztec \| datamatrix \| pdf417
`data`required
`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

Code samples

cURLbash

# 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'

TypeScript / Node — @2sio/sdktypescript

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)

Python — 2siopython

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)

MCP — Claude Desktop / AgentKit / any MCP hostjson

// 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
        }
      }
    }
  }
}

Discovery

/api/directory — full catalog of every endpoint
/openapi.json — OpenAPI 3.1 spec (per-op x-payment-info, x402Payment security)
/.well-known/x402 — machine-readable service descriptor for x402-aware crawlers
/.well-known/mcp/server-card.json — MCP SEP-1649 server card
/llms.txt — plain-text manifest for LLM ingestion

2s.io is x402-native. Every call is paid per-request from a USDC-funded EVM wallet on Base — no signup, no API keys, no monthly fees. Source code: github.com/2s-io/sdk.