# Proofwork Base Market Pulse

> Proofwork Base Market Pulse is a paid API for AI agents from proofwork-the402-webhook.phase-voice.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns a cross-source ETH/USDC market pulse report comparing Base DEX pool prices against Coinbase reference spot prices, including spread percentage and liquidity data.

## Facts

- Endpoint: GET https://proofwork-the402-webhook.phase-voice.workers.dev/v1/base-market-pulse
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/proofwork-base-market-pulse-f94c66b7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MbJMcYop0vzM1BJEZL1vS

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 proofwork-base-market-pulse-f94c66b7
```

Example prompt: Can you pull the latest Base market pulse report showing the WETH/USDC pool price on Base DEX versus the Coinbase ETH-USD spot price, and tell me what the current spread is?

## When to prefer this

Choose this endpoint when you need a low-cost ($0.01), verifiable, evidence-grade snapshot of ETH market conditions on the Base network that cross-references on-chain DEX data with a centralized Coinbase spot price. It is ideal for agents that need cryptographically auditable market data rather than a raw price oracle, or when building on Base and needing both DEX liquidity context and a CEX price anchor in a single call.

## Known failure modes

- Payment not received or insufficient USDC (x402 payment required, $0.01 USDC)
- Base network RPC unavailable or lagging, leading to stale block data
- Coinbase price feed temporarily unavailable, causing incomplete cross-source comparison
- DEX pool data unavailable due to subgraph or indexer downtime
- Rate limiting if payment processing fails repeatedly

## How this service works

Small non-cyber evidence and data APIs payable per request with x402 on Base.

## Output

A JSON report containing the report type identifier, observed timestamp, Base chain ID and latest block number, the signed spread percentage between DEX and reference prices, the WETH/USDC DEX pool price in USD and liquidity in USD, and the Coinbase ETH-USD spot reference price.

## 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
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "report": "base_eth_cross_source_market_pulse",
  "observed_at": "2026-08-12T00:00:00.000Z",
  "base_network": {
   "chain_id": 8453,
   "market_data_provider": "GeckoTerminal keyless public API"
  },
  "base_dex_pool": {
   "pair": "WETH/USDC",
   "price_usd": 4001,
   "liquidity_usd": 1000000
  },
  "coinbase_reference": {
   "pair": "ETH-USD",
   "spot_usd": 4000
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/proofwork-base-market-pulse-f94c66b7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from proofwork-the402-webhook.phase-voice.workers.dev](https://www.zero.xyz/host/proofwork-the402-webhook.phase-voice.workers.dev/llms.txt)