# Barker DeFi Vault Supply Yield Query

> Barker DeFi Vault Supply Yield Query is a paid API for AI agents from mcp.barker.money, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Returns a ranked list of real-time stablecoin supply yield pools across 500+ DeFi protocols, with APY, TVL, protocol, chain, and asset details.

## Facts

- Endpoint: GET https://mcp.barker.money/barker_defi_vaults?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/barker-defi-vault-supply-yield-query-fb7aadbf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_w9X0YtridiKju5gb3WcZt

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-defi-vault-supply-yield-query-fb7aadbf
```

Example prompt: Show me the top 20 stablecoin yield pools on Ethereum right now, sorted by APY — I want to see which protocols are paying the most for USDC or USDT deposits.

## When to prefer this

Use this endpoint when you need a broad ranked survey of stablecoin yield opportunities across many protocols and chains simultaneously — ideal for comparison, discovery, and screening. Prefer this over single-pool dossier endpoints when you don't know which specific pool to look up, or when the user wants to see ranked options rather than details on one pool.

## Known failure modes

- Invalid asset symbol returns empty results or error
- Invalid chain name returns empty results or error
- sort parameter must be exactly 'apy' or 'tvl' — other values rejected
- limit exceeding 100 returns validation error
- Real-time data may have brief staleness during protocol indexing refresh

## How this service works

Query real-time stablecoin supply yield pools from Barker's index of 500+ DeFi protocols. Returns ranked rows with protocol_name, chain_name, asset_symbol, supply_apy_total (decimal — multiply by 100 for %), and supply_tvl (USD). Use for questions like 'best stablecoin yield', 'where to earn on USDC', 'compare lending rates', '稳定币利率'.

## Output

Returns ranked rows, each containing protocol_name, chain_name, asset_symbol, supply_apy_total (decimal — multiply by 100 for percent), and supply_tvl (USD). Results can be sorted by APY or TVL and filtered by specific stablecoin asset and/or blockchain chain.

## 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": {
      "sort": {
       "enum": [
        "apy",
        "tvl"
       ],
       "type": "string",
       "description": "Sort key"
      },
      "asset": {
       "type": "string",
       "description": "Stablecoin symbol (lowercase): usdt, usdc, dai, usde, usds, fdusd, gho, crvusd, pyusd, sdai, frxusd, tusd, lusd, dola, etc."
      },
      "chain": {
       "type": "string",
       "description": "Chain name (lowercase): ethereum, bsc, arbitrum, base, polygon, optimism, avalanche, solana, etc."
      },
      "limit": {
       "type": "integer",
       "maximum": 100,
       "minimum": 1,
       "description": "Row count (default 50, max 100)"
      }
     }
    }
   },
   "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-defi-vault-supply-yield-query-fb7aadbf/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)