Look up ISO 3166-2 subdivisions (states, provinces, regions). Pass code (e.g. US-CA) to resolve a single subdivision → name + country, or country (2-letter ISO 3166-1, e.g. US) to list all of that country's subdivisions with their codes. Bundled authoritative ISO 3166-2 data (~3.8k subdivisions across 237 countries) — the address/jurisdiction ground truth an LLM hallucinates codes for.
/api/iso/subdivisionPAYMENT-SIGNATURE.The subdivision API is a pay-per-call iso endpoint built for AI agents and autonomous software. Look up ISO 3166-2 subdivisions (states, provinces, regions).
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 subdivision data source for an agent tool-use loop, an MCP host, or a backend that needs iso data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
code | string | min 4 chars · max 6 chars |
country | string | min 2 chars · max 2 chars |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/iso/subdivision?code=xxxx&country=xx' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/iso/subdivision?code=xxxx&country=xx' \ -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/iso/subdivision?code=xxxx&country=xx'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.iso.subdivision({
"code": "xxxx",
"country": "xx"
})
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.iso.subdivision(code="xxxx", country="xx")
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": "iso.subdivision",
"arguments": {
"code": "xxxx",
"country": "xx"
}
}
}| Field | Type | Description |
|---|---|---|
query | object | |
found | boolean | |
subdivision | object | |
country | string | |
subdivisions | array | |
source | object |
{
"query": {
"code": "example",
"country": "example"
},
"found": false,
"subdivision": {
"code": "example",
"name": "example",
"country": "example"
},
"country": "example",
"subdivisions": [
{
"code": "example",
"name": "example",
"country": "example"
}
],
"source": {
"provider": "example",
"url": "example",
"license": "example"
}
}