# x402 Safe Stablecoin Yields — DeFi Due-Diligence Pool Screener

> x402 Safe Stablecoin Yields — DeFi Due-Diligence Pool Screener is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Returns a curated, pre-screened list of stablecoin yield pools (from DefiLlama) filtered for safety: TVL > $5M, APY 1–25%, enriched with protocol age and hack history, sorted safest-first.

## Facts

- Endpoint: GET https://x402-data-api.sigrunner.workers.dev/defi/safe-yields?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-safe-stablecoin-yields-defi-due-diligence-pool-screener-141f3538
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8NzOH6XwxYogflP5Q2e2g

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 x402-safe-stablecoin-yields-defi-due-diligence-pool-screener-141f3538
```

Example prompt: Show me the safest stablecoin yield pools on Ethereum right now — I want options that have been vetted for hack history and protocol age, limited to the top 10.

## When to prefer this

Use this endpoint when an AI agent needs to make a stablecoin yield allocation decision and wants due diligence already applied — specifically when you need hack history and protocol age baked into the ranking rather than raw APY lists. Prefer this over generic DeFi yield APIs (like the sibling top-pools endpoint) when safety filtering and risk metadata matter. Best when the agent doesn't want to run its own TVL or hack-history filters.

## Known failure modes

- Invalid chain parameter returns empty pool list or error
- Limit exceeding 30 is clamped or rejected
- DefiLlama data source temporarily unavailable causes stale or empty response
- Network timeout from Cloudflare Workers edge if upstream DeFi data is slow

## How this service works

Vetted stablecoin yields: top stablecoin pools (DefiLlama, TVL>$5M, APY 1-25%) joined with each protocol's age and hack history, safest-yield first; optional ?chain= & ?limit=. No required params. Use when an agent needs where to park stablecoins with due-diligence already applied.

## Output

A JSON object containing an array of pools, each with: project name, chain, stablecoin symbol, APY (number), TVL in USD (integer), protocol age in days, and a boolean indicating whether the protocol has been hacked before. Results are pre-filtered (TVL > $5M, APY 1–25%) and sorted safest-first.

## 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": {
      "chain": {
       "type": "string",
       "description": "optional chain filter"
      },
      "limit": {
       "type": "string",
       "description": "optional, max 30"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "pools"
     ],
     "properties": {
      "pools": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "project",
         "chain",
         "symbol",
         "apy",
         "tvl_usd",
         "protocol_age_days",
         "hacked_before"
        ],
        "properties": {
         "apy": {
          "type": "number"
         },
         "chain": {
          "type": "string"
         },
         "symbol": {
          "type": "string"
         },
         "project": {
          "type": "string"
         },
         "tvl_usd": {
          "type": "integer"
         },
         "hacked_before": {
          "type": "boolean"
         },
         "protocol_age_days": {
          "type": "integer"
         }
        }
       }
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "pools": [
   {
    "apy": 4.2,
    "chain": "Ethereum",
    "symbol": "USDC",
    "project": "aave-v3",
    "tvl_usd": 900000000,
    "hacked_before": true,
    "protocol_age_days": 1662
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-safe-stablecoin-yields-defi-due-diligence-pool-screener-141f3538/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-data-api.sigrunner.workers.dev](https://www.zero.xyz/host/x402-data-api.sigrunner.workers.dev/llms.txt)