trade.locode

Look up or search UN/LOCODE — the United Nations Code for Trade and Transport Locations (~116k locations, all countries). Pass `locode` for an exact code (e.g. USNYC or 'US NYC'). Or pass `query` to search location names, optionally filtered by `country` (ISO 3166 alpha-2) and `function` (port, rail, road, airport, postal, multimodal, fixed, border). Each result: locode, name, country, subdivision, transport functions, entry status, IATA code where it differs, and coordinates. UN/LOCODE is the standard location identifier in shipping schedules, EDI messages, and customs documents.

price

$0.0010 USDC per call

method

GET/api/trade/locode

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
`locode`	string	Exact UN/LOCODE to look up (e.g. USNYC or 'US NYC'). Pass this OR query. match ^[A-Za-z]{2}[\s-]?[A-Za-z0-9]{3}$
`query`	string	Location name to search (e.g. Rotterdam). Pass this OR locode. min 2 chars · max 120 chars
`country`	string	Restrict query-mode results to one country (ISO 3166 alpha-2, e.g. NL). match ^[A-Za-z]{2}$
`function`	string	Restrict query-mode results to locations with this transport function. one of: port \| rail \| road \| airport \| postal \| multimodal \| fixed \| border
`limit`	integer	Max query-mode results, 1–50 (default 10). min 1 · max 50

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/trade/locode?locode=example&query=xx&country=example&function=port&limit=1'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/trade/locode?locode=example&query=xx&country=example&function=port&limit=1' \
  -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/trade/locode?locode=example&query=xx&country=example&function=port&limit=1'

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.trade.locode({
  "locode": "example",
  "query": "xx",
  "country": "example",
  "function": "port",
  "limit": 1
})

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.trade.locode(locode="example", query="xx", country="example", function="port", limit=1)

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": "trade.locode",
    "arguments": {
      "locode": "example",
      "query": "xx",
      "country": "example",
      "function": "port",
      "limit": 1
    }
  }
}

Response

Field	Type	Description
`ok`	boolean	one of: true
`items`	array
`total`	integer	Total matching rows upstream; null when unknown.
`source`	object
`page`	object

Example response datajson

{
  "ok": true,
  "items": [
    {
      "locode": "example",
      "country": "example",
      "location": "example",
      "name": "example",
      "nameAscii": "example",
      "subdivision": {
        "code": "example",
        "name": "example"
      },
      "functions": {
        "raw": "example",
        "list": [
          "example"
        ]
      },
      "status": {
        "code": "example",
        "meaning": "example"
      },
      "iata": "example",
      "coordinates": {
        "lat": 1,
        "lon": 1
      },
      "updated": "example"
    }
  ],
  "total": 1,
  "source": {
    "provider": "example",
    "url": "example",
    "license": "example"
  },
  "page": {
    "number": 1,
    "size": 1,
    "pages": 1
  }
}

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.