worldbank.indicator

World Bank Open Data — fetch a time series of a specific indicator for a country (or 'all'). 1000+ indicators across 200+ countries, many series going back to 1960. Indicator codes are dotted-token strings, e.g., NY.GDP.MKTP.CD (GDP current US$), SP.POP.TOTL (population total), FP.CPI.TOTL.ZG (inflation CPI annual %), SL.UEM.TOTL.ZS (unemployment %), SE.ADT.LITR.ZS (adult literacy %), SP.DYN.LE00.IN (life expectancy). Country = ISO 2-letter (e.g., US, CN), ISO 3-letter (USA, CHN), or 'all'. Optional yearFrom/yearTo bracket. Each observation: country id+name, year, numeric value (may be null for missing), obsStatus. Returns indicator name + total count + pagination metadata.

price

$0.0012 USDC per call

method

GET/api/worldbank/indicator

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
`country`required	string	match ^([A-Za-z]{2,3}\|all)$
`indicator`required	string	match ^[A-Za-z0-9.]{3,40}$
`yearFrom`	integer	min 1960 · max 2100
`yearTo`	integer	min 1960 · max 2100
`limit`	integer	min 1 · max 100
`page`	integer	min 1 · max 100

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/worldbank/indicator?country=example&indicator=example&yearFrom=1960&yearTo=1960&limit=50&page=1'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/worldbank/indicator?country=example&indicator=example&yearFrom=1960&yearTo=1960&limit=50&page=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/worldbank/indicator?country=example&indicator=example&yearFrom=1960&yearTo=1960&limit=50&page=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.worldbank.indicator({
  "country": "example",
  "indicator": "example",
  "yearFrom": 1960,
  "yearTo": 1960,
  "limit": 50,
  "page": 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.worldbank.indicator(country="example", indicator="example", yearFrom=1960, yearTo=1960, limit=50, page=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": "worldbank.indicator",
    "arguments": {
      "country": "example",
      "indicator": "example",
      "yearFrom": 1960,
      "yearTo": 1960,
      "limit": 50,
      "page": 1
    }
  }
}

Response

Field	Type	Description
`query`	object
`meta`	object
`observations`	array
`source`	object

Example response datajson

{
  "query": {
    "country": "example",
    "indicator": "example",
    "yearFrom": 1,
    "yearTo": 1,
    "limit": 1,
    "page": 1
  },
  "meta": {
    "indicatorId": "example",
    "indicatorName": "example",
    "totalCount": 1,
    "page": 1,
    "pages": 1,
    "lastUpdated": "example"
  },
  "observations": [
    {
      "countryId": "example",
      "countryName": "example",
      "year": 1,
      "value": 1,
      "obsStatus": "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.