country.lookup

Look up country metadata via REST Countries. Pass alpha2 (2-letter ISO 3166-1), alpha3 (3-letter), or name (with optional fullText=true for exact match). Returns common + official name, ISO codes, region + subregion, independence + UN-member flags, capital(s), population, area km², landlocked flag, neighboring borders (alpha-3), timezones, currencies (code → name + symbol), languages, calling code, flag emoji + SVG/PNG URLs, lat/lng coordinates, Google Maps + OSM URLs, driving side, top-level domains.

price

$0.0012 USDC per call

method

GET/api/country/lookup

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

Name	Type	Description
`alpha2`	string	min 2 chars · max 2 chars · match ^[A-Za-z]{2}$
`alpha3`	string	min 3 chars · max 3 chars · match ^[A-Za-z]{3}$
`name`	string	min 2 chars · max 80 chars
`fullText`	boolean

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/country/lookup?alpha2=xx&alpha3=xxx&name=xx&fullText=false'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/country/lookup?alpha2=xx&alpha3=xxx&name=xx&fullText=false' \
  -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/country/lookup?alpha2=xx&alpha3=xxx&name=xx&fullText=false'

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.country.lookup({
  "alpha2": "xx",
  "alpha3": "xxx",
  "name": "xx",
  "fullText": false
})

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.country.lookup(alpha2="xx", alpha3="xxx", name="xx", fullText=False)

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": "country.lookup",
    "arguments": {
      "alpha2": "xx",
      "alpha3": "xxx",
      "name": "xx",
      "fullText": false
    }
  }
}

Response

Field	Type	Description
`query`	object
`returned`	integer
`countries`	array
`source`	object

Example response datajson

{
  "query": {
    "alpha2": "example",
    "alpha3": "example",
    "name": "example",
    "fullText": false
  },
  "returned": 1,
  "countries": [
    {
      "name": {
        "common": "example",
        "official": "example"
      },
      "alpha2": "example",
      "alpha3": "example",
      "numericCode": "example",
      "cioc": "example",
      "region": "example",
      "subregion": "example",
      "independent": false,
      "unMember": false,
      "capital": [
        "example"
      ],
      "population": 1,
      "areaKm2": 1,
      "landlocked": false,
      "borders": [
        "example"
      ],
      "timezones": [
        "example"
      ],
      "currencies": {},
      "languages": {},
      "callingCode": "example",
      "flag": "example",
      "flagSvg": "example",
      "flagPng": "example",
      "coordinates": {
        "lat": 1,
        "lng": 1
      },
      "googleMapsUrl": "example",
      "openStreetMapsUrl": "example",
      "drivingSide": "example",
      "tld": [
        "example"
      ]
    }
  ],
  "source": {
    "provider": "example",
    "url": "https://example.com",
    "license": "example"
  }
}

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.