# Basewatch Alerts — Base Chain New Pool Alert Feed

> Basewatch Alerts — Base Chain New Pool Alert Feed is a paid API for AI agents from api.firstmention.uk, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).

Returns scored alerts for newly discovered liquidity pools on Base, filtered by quote asset, liquidity depth, and risk score threshold

## Facts

- Endpoint: GET https://api.firstmention.uk/s/basewatch/alerts?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basewatch-alerts-base-chain-new-pool-alert-feed-389ae13f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PPXtyU2XE__AGFVjOAg7I

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 basewatch-alerts-base-chain-new-pool-alert-feed-389ae13f
```

Example prompt: Show me all new liquidity pools on Base from the last 5000 blocks where the quote asset is USDC, minimum liquidity is $1000, and only return pools with a score above 4 — limit to 20 results.

## When to prefer this

Use this endpoint when you need real-time, risk-scored alerts for newly launched liquidity pools specifically on Base chain, with built-in filtering by quote asset, liquidity depth, and risk score. Prefer this over generic DEX screeners when you need structured alert objects with flags, grades, and reasons ready for automated decision-making, and when paying per-call via x402/USDC is acceptable.

## Known failure modes

- Invalid or out-of-range query parameters (e.g. limit > 40 or blocks > 43200) return a 400 error
- Payment not provided or insufficient USDC results in 402 Payment Required
- No pools found matching filters returns ok:true with empty arrays
- Network or chain RPC issues may cause delayed or stale block data
- Overly restrictive min_score or min_liquidity_usd filters may return zero alerts

## How this service works

Pay-per-call HTTP APIs, paid with x402 in USDC on Base (eip155:8453): agentkit, api-change-check, basedue, basewatch, chainread, check-sanctions, chgwatch, company-facts, composite, edgar, feednews, pageaudit, solcheck, token-dd, txpreflight, walletcheck, webmd, webread, websearch, x402index. Each operation describes its service.

## Output

A JSON object containing: a list of pool alerts each with pool address, risk score, letter grade, DEX venue, liquidity in USD, approximate age in minutes, token symbols, alert flags, and a human-readable reason string; plus summary counts (total returned, brand-new under 30 min), active filters, the current Base block number, and the endpoint name.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "number",
       "description": "Max pools to enrich and return (max 40)"
      },
      "quote": {
       "type": "string",
       "description": "Quote filter: any, weth or usdc"
      },
      "blocks": {
       "type": "number",
       "description": "Look-back window in blocks (max 43200)"
      },
      "min_score": {
       "type": "number",
       "description": "/alerts only: drop pools whose score is below this"
      },
      "min_liquidity_usd": {
       "type": "number",
       "description": "Drop pools with quote-side depth below this USD value"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "chain": {
       "type": "string"
      },
      "pools": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "pool": {
          "type": "string"
         },
         "grade": {
          "type": "string"
         },
         "score": {
          "type": "number"
         },
         "venue": {
          "type": "string"
         },
         "liquidityUsd": {
          "type": "number"
         },
         "ageApproxMinutes": {
          "type": "number"
         },
         "liquidityQuoteAsset": {
          "type": "string"
         }
        }
       }
      },
      "alerts": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "pool": {
          "type": "string"
         },
         "flags": {
          "type": "array"
         },
         "score": {
          "type": "number"
         },
         "venue": {
          "type": "string"
         },
         "reason": {
          "type": "string
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "chain": "base",
  "pools": [
   {
    "pool": "0x8f2a1c4b9e0d7f3a6b5c4d3e2f1a0b9c8d7e6f5a",
    "grade": "ok",
    "score": 5.11,
    "venue": "aerodrome",
    "liquidityUsd": 128400.55,
    "ageApproxMinutes": 96,
    "liquidityQuoteAsset": "USDC"
   }
  ],
  "alerts": [
   {
    "pool": "0x8f2a1c4b9e0d7f3a6b5c4d3e2f1a0b9c8d7e6f5a",
    "flags": [],
    "score": 5.11,
    "venue": "aerodrome",
    "reason": "quote-side depth $128401, age ~96m, venue aerodrome",
    "tokens": [
     {
      "symbol": "WETH",
      "decimals": 18
     },
     {
      "symbol": "USDC",
      "decimals": 6
     }
    ],
    "liquidityUsd": 128400.55,
    "ageApproxMinutes": 96
   }
  ],
  "counts": {
   "returned": 1,
   "brandNewUnder30min": 1
  },
  "filters": {
   "limit": 10,
   "quote": "usdc",
   "min_liquidity_usd": 500
  },
  "endpoint": "alerts",
  "asOfBlock": 36512345
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basewatch-alerts-base-chain-new-pool-alert-feed-389ae13f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.firstmention.uk](https://www.zero.xyz/host/api.firstmention.uk/llms.txt)