World Bank indicator series

Fetch a World Bank indicator time series for a country (e.g. Send GET /api/world-bank-indicator with the required fields country and indicator and pay $0.005 per call over x402 or MPP (there is no free tier). It returns a JSON object with country, indicator, indicatorName, count and series.

GDP, inflation, unemployment, population). Open data, no key. ?country=US&indicator=NY.GDP.MKTP.CD&startYear=2018&endYear=2022

Category: Live public data · Tags: world-bank gdp inflation unemployment macro indicators country economic-data

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Parameters

Example request

curl -i "https://agent402.tools/api/world-bank-indicator?country=US&indicator=NY.GDP.MKTP.CD&startYear=2018&endYear=2022"

Without payment this returns HTTP 402 Payment Required with the exact price for world-bank-indicator; any x402 v2 or MPP client pays it and retries.

Example response

{
  "country": "US",
  "indicator": "NY.GDP.MKTP.CD",
  "indicatorName": "GDP (current US$)",
  "count": 5,
  "series": [
    {
      "year": 2022,
      "value": 25462700000000
    }
  ]
}

From an MCP client

catalog.call {
  "slug": "world-bank-indicator",
  "params": {
    "country": "US",
    "indicator": "NY.GDP.MKTP.CD",
    "startYear": 2018,
    "endYear": 2022
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for world-bank-indicator; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• country and indicator are required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/world-bank-indicator is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/world-bank-indicator?country=US&indicator=NY.GDP.MKTP.CD&startYear=2018&endYear=2022");

Part of these workflows

World Bank indicator series is one step in this skill pack, each sold as a single call:

• World Bank country data - GDP and population for a country - two key World Bank indicators in one call.

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