calendar.business-days

Holiday-aware business-day calculator for 200+ countries. Three modes: pass start + addDays (signed integer) to shift a date by N business days; pass start + end to count business days between two dates (exclusive of start, inclusive of end); pass start alone to check one date (is it a business day, which holiday, next/previous business day). Query: country (ISO 3166-1 alpha-2), start (YYYY-MM-DD), optional region (subdivision code), addDays XOR end, optional weekend (comma-separated days, default sat,sun — e.g. fri,sat for the Gulf), optional types (holiday types treated as closures, default public,bank). Skipped holidays are itemized in the response. Use for payment terms, SLA deadlines, and delivery-date math.

price
$0.0010 USDC per call
method
GET/api/calendar/business-days
payment
x402 v2 · USDC on Base (EIP-3009) or Solana (SPL transfer)
auth
None. Sign the payment, retry with PAYMENT-SIGNATURE.
tier
Tier 0 — no paid upstream

Parameters

NameTypeDescription
countryrequiredstringISO 3166-1 alpha-2 country code, e.g. US, DE, JP.
min 2 chars · max 2 chars
startrequiredstringAnchor date, YYYY-MM-DD.
match ^\d{4}-\d{2}-\d{2}$
addDaysintegerSigned number of business days to add to start (non-zero, ±3660). Mutually exclusive with end.
min -3660 · max 3660
endstringEnd date YYYY-MM-DD. Counts business days after start through end. Mutually exclusive with addDays.
match ^\d{4}-\d{2}-\d{2}$
regionstringOptional subdivision code — e.g. CA for US-California, BY for DE-Bavaria.
min 1 chars · max 10 chars
weekendstringOptional comma-separated weekend days (mon..sun). Default "sat,sun"; use "fri,sat" for Gulf states.
max 30 chars
typesstringOptional comma-separated holiday types treated as business closures (public, bank, school, optional, observance). Default "public,bank".
max 60 chars

Code samples

cURLbash
# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/calendar/business-days?country=xx&start=2024-01-01&addDays=-3660&end=2024-01-01&region=example&weekend=example&types=example'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/calendar/business-days?country=xx&start=2024-01-01&addDays=-3660&end=2024-01-01&region=example&weekend=example&types=example' \
  -H 'PAYMENT-SIGNATURE: <base64-json-payload>'

# Or use the canonical runner (handles probe → sign → retry):
#   EVM_PRIVATE_KEY=0x... node --env-file=.env.local \
#     --experimental-strip-types scripts/x402-pay.ts \
#     'https://2s.io/api/calendar/business-days?country=xx&start=2024-01-01&addDays=-3660&end=2024-01-01&region=example&weekend=example&types=example'
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.calendar.businessDays({
  "country": "xx",
  "start": "2024-01-01",
  "addDays": -3660,
  "end": "2024-01-01",
  "region": "example",
  "weekend": "example",
  "types": "example"
})

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.calendar.business_days(country="xx", start="2024-01-01", addDays=-3660, end="2024-01-01", region="example", weekend="example", types="example")

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": "calendar.business-days",
    "arguments": {
      "country": "xx",
      "start": "2024-01-01",
      "addDays": -3660,
      "end": "2024-01-01",
      "region": "example",
      "weekend": "example",
      "types": "example"
    }
  }
}

Response

FieldTypeDescription
okboolean
one of: true
itemsarray
totalintegerTotal matching rows upstream; null when unknown.
sourceobject
Example response datajson
{
  "ok": true,
  "items": [
    {
      "mode": "example",
      "country": "example",
      "region": "example",
      "start": "example",
      "addDays": 1,
      "result": "example",
      "calendarDaysSpanned": 1,
      "holidaysSkipped": [
        {
          "date": "example",
          "name": "example"
        }
      ],
      "end": "example",
      "businessDays": 1,
      "calendarDays": 1,
      "holidaysInRange": [
        {
          "date": "example",
          "name": "example"
        }
      ],
      "isBusinessDay": false,
      "isWeekend": false,
      "isHoliday": false,
      "holidayNames": [
        "example"
      ],
      "nextBusinessDay": "example",
      "previousBusinessDay": "example"
    }
  ],
  "total": 1,
  "source": {
    "provider": "example",
    "url": "example",
    "license": "example"
  }
}

Discovery

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.