# Market Capitalization as % of GDP by Country

> Market Capitalization as % of GDP by Country is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns the latest stock market capitalization of listed domestic companies as a share of GDP for every country worldwide.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/market-capitalization-gdp
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/market-capitalization-as-of-gdp-by-country-8fc91392
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R4ssVD29UBSbqVO1-JB7z

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability market-capitalization-as-of-gdp-by-country-8fc91392 -d '<json body>'
```

Example prompt: What's the latest stock market capitalization as a share of GDP for every country — I want to see which nations have the biggest and smallest markets relative to their economies.

## When to prefer this

Use this endpoint when you need a cross-country snapshot of stock market development relative to economic size (the 'Buffett indicator' at country level), with no filtering parameters required. Prefer this over building your own scraper or querying World Bank APIs directly when you need a ready-to-consume JSON response with global coverage in a single call.

## Known failure modes

- Data may not be available for every country (returns null or omits the country)
- Underlying data source may have stale values for countries that infrequently report
- HTTP 402 if payment is not supplied
- HTTP 500 if upstream data provider is unavailable
- Response may be empty or partial if data refresh is in progress

## How this service works

Latest market capitalization of listed domestic companies as a share of GDP across every country. Returns JSON.

## Output

A JSON object containing the most recent available market capitalization of listed domestic companies as a percentage of GDP for every country and region, with one value per country, likely including country name, country code, value (%), and reference year.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/market-capitalization-as-of-gdp-by-country-8fc91392/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)