# MCPFax Markets — On-Chain Token Prices

> MCPFax Markets — On-Chain Token Prices is a paid API for AI agents from mcpfax-markets.bowling-anthony.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Fetches current on-chain token prices for DeFi tokens, priced at $0.001 USDC per call via x402 micropayment on Base.

## Facts

- Endpoint: GET https://mcpfax-markets.bowling-anthony.workers.dev/defi/token-prices
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mcpfax-markets-on-chain-token-prices-2383b866
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_omtx3we8uY-VHklegfJvA

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 mcpfax-markets-on-chain-token-prices-2383b866
```

Example prompt: What's the current on-chain price of WBTC right now? Use the MCPFax token price feed to look it up.

## When to prefer this

Choose this endpoint when you need on-chain token price data for DeFi tokens, especially when you want prices sourced directly from decentralized liquidity rather than centralized exchange feeds. Ideal for agents performing DeFi trading decisions, portfolio valuation, or arbitrage detection where on-chain accuracy matters. Prefer this over CEX price APIs when working in a fully on-chain or DeFi context.

## Known failure modes

- Unknown or unsupported token address returns an error or empty result
- Network congestion may cause stale or delayed price data
- Invalid token identifier format results in a bad request error
- Payment failure on Base network blocks the call
- Token with insufficient on-chain liquidity may return unreliable price

## How this service works

MCPFax markets — On-chain token prices (defi_token_prices). Price: $0.001 USDC per call on Base.

## Output

Returns current on-chain price data for the requested DeFi token(s), including price in USD and associated token metadata, sourced from on-chain liquidity pools or aggregated DeFi price feeds.

## 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"
    }
   },
   "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/mcpfax-markets-on-chain-token-prices-2383b866/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcpfax-markets.bowling-anthony.workers.dev](https://www.zero.xyz/host/mcpfax-markets.bowling-anthony.workers.dev/llms.txt)