# Barker Stablecoin Market Overview

> Barker Stablecoin Market Overview is a paid API for AI agents from mcp.barker.money, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns a real-time snapshot of the global stablecoin market including total market cap, yield-bearing cap, and distribution by asset and chain.

## Facts

- Endpoint: GET https://mcp.barker.money/barker_market_overview
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/barker-stablecoin-market-overview-56384645
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4VBonHUl_ClmseGotTXgY

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 barker-stablecoin-market-overview-56384645
```

Example prompt: Give me a quick stablecoin market snapshot — total market cap, how much is yield-bearing, and the top assets and chains by share right now.

## When to prefer this

Use this endpoint when you need a high-level, aggregated view of the stablecoin market — total cap, yield-bearing cap, and distribution by asset or chain — rather than per-pool or per-protocol data. Prefer this over sibling endpoints when the user asks about market-wide statistics, dominance, or macro stablecoin trends rather than specific yield pools or execution routes.

## Known failure modes

- Data temporarily unavailable if upstream on-chain indexing is stale
- Payment failure (402) if the x402 micropayment of $0.001 USDC is not provided
- Malformed response if the endpoint is under maintenance
- Rate limiting if called too frequently without valid payment headers

## How this service works

Barker's stablecoin market snapshot: total market cap, yield-bearing cap, asset distribution, chain distribution. Use for 'stablecoin market cap', 'USDT market share', '稳定币市场份额'. share_pct fields are decimals (0.425 = 42.5%).

## Output

A structured JSON snapshot containing: total stablecoin market cap, yield-bearing stablecoin market cap, asset distribution (e.g. USDT, USDC, DAI share as decimals), and chain distribution (e.g. Ethereum, Tron, Solana share as decimals). Share percentages are expressed as decimals where 0.425 = 42.5%.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/barker-stablecoin-market-overview-56384645/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp.barker.money](https://www.zero.xyz/host/mcp.barker.money/llms.txt)