# Vextorium Liquid Staking Rates

> Vextorium Liquid Staking Rates is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-19).

Returns on-chain exchange rates and current APY for major Ethereum liquid staking tokens (wstETH, rETH, cbETH, weETH, sfrxETH) against ETH, sourced from their smart contracts and DefiLlama.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/liquid-staking-rates?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-liquid-staking-rates-42927a0c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gSO_E6Y-XpVnJoRiN63Pd

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 vextorium-liquid-staking-rates-42927a0c -d '<json body>'
```

Example prompt: What are the current on-chain exchange rates and APY for all the major Ethereum liquid staking tokens — wstETH, rETH, cbETH, weETH, and sfrxETH?

## When to prefer this

Choose this endpoint when you need authoritative, on-chain exchange rates for Ethereum LSTs (wstETH, rETH, cbETH, weETH, sfrxETH) directly from their smart contracts, combined with live APY figures. Prefer this over DEX price feeds when you want the true redemption rate (not market price) and staking yield in a single call. Ideal for portfolio valuation, yield comparison, or any agent workflow needing LST fundamentals rather than spot trading prices.

## Known failure modes

- Ethereum node or contract read failure may result in missing or null token data
- DefiLlama APY data may be temporarily unavailable, returning null apy_pct
- Payment not completed (x402 protocol) results in 402 response with no data
- Rate limiting or quota exhaustion for the $0.004/call micropayment API
- Stale data if on-chain contracts are congested or DefiLlama cache is delayed

## How this service works

558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.

## Output

A JSON object listing each liquid staking token (e.g. wstETH, rETH, cbETH, weETH, sfrxETH) with: the base input asset (e.g. stETH or ETH), the number of base asset units each token is worth ('worth', reflecting accumulated staking rewards), the current APY as a percentage, and the Ethereum contract address. Also includes a source attribution note (Ethereum contracts + DefiLlama).

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [],
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "note": {
       "type": [
        "string",
        "null"
       ]
      },
      "source": {
       "type": [
        "string",
        "null"
       ]
      },
      "tokens": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": [
         "null",
         "object"
        ],
        "properties": {
         "in": {
          "type": [
           "null",
           "string"
          ]
         },
         "token": {
          "type": [
           "null",
           "string"
          ]
         },
         "worth": {
          "type": [
           "null",
           "number"
          ]
         },
         "apy_pct": {
          "type": [
           "null",
           "number"
          ]
         },
         "contract": {
          "type": [
           "null",
           "string"
          ]
         }
        }
       }
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "'worth' = how many units of the base asset you get per token (rises with staking rewards).",
  "source": "Contracts on Ethereum + DefiLlama (APY)",
  "tokens": [
   {
    "in": "stETH",
    "token": "wstETH",
    "worth": 1.24540188,
    "apy_pct": 2.238,
    "contract": "0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0"
   },
   {
    "in": "ETH",
    "token": "rETH",
    "worth": 1.17295968,
    "apy_pct": 2.17,
    "contract": "0xae78736Cd615f374D3085123A210448E74Fc6393"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-liquid-staking-rates-42927a0c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)