# QuietSignal L2Beat Discovery Feed

> QuietSignal L2Beat Discovery Feed is a paid API for AI agents from 83-29-153-50.sslip.io, paid per call via x402, $0.01/call, status down (last checked 2026-10-12).

Returns recent L2Beat smart-contract discovery update records, filterable by project name and severity, for Layer 2 blockchain monitoring.

## Facts

- Endpoint: GET https://83-29-153-50.sslip.io/v1/l2beat-discovery?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quietsignal-l2beat-discovery-feed-e681c560
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T-2JT7kBF366Rj_TMXJSR

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 quietsignal-l2beat-discovery-feed-e681c560
```

Example prompt: Can you pull the latest L2Beat discovery updates for the BASE project, filtered to high severity only, and show me up to 10 records?

## When to prefer this

Use this endpoint when you need structured, machine-readable L2Beat discovery update records for Layer 2 smart contract monitoring, particularly when you want to filter by specific project name or severity level and pay per-call with USDC via HTTP 402. Prefer this over scraping L2Beat directly when you need a reliable, agent-friendly API with a stable schema.

## Known failure modes

- Invalid severity enum value returns a validation error
- Project name not found returns an empty projects array
- Limit parameter outside 1-100 range is rejected with a schema validation error
- Payment not provided or insufficient USDC results in HTTP 402 response
- Upstream L2Beat data unavailable may return stale or empty results

## How this service works

QuietSignal Public Data: independent, read-only rollup, wallet, opportunity, and developer-data facts for agents, paid per request with USDC over HTTP 402 on Base.

## Output

A JSON object containing a schema identifier, a list of discovery update records (each with project name, group, event ID, severity level, affected component, diff URLs, and observation timestamp), a disclaimer about data provenance, and a count of matched projects.

## 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",
     "required": [],
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 100,
       "minimum": 1,
       "description": "Maximum number of update records to return"
      },
      "project": {
       "type": "string",
       "maxLength": 80,
       "minLength": 1,
       "description": "Optional case-insensitive project-name filter"
      },
      "severity": {
       "enum": [
        "high",
        "medium",
        "normal"
       ],
       "type": "string",
       "description": "Optional severity filter"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "schema": "l2beat-discovery/v1",
  "projects": [
   {
    "name": "BASE",
    "group": "OP Stack",
    "event_id": "evt_0123456789abcdef012345678",
    "severity": "high",
    "component": "OptimismPortal",
    "diff_urls": [
     "https://disco.l2beat.com/diff/example"
    ],
    "observed_at": "2026-08-04T00:00:00Z"
   }
  ],
  "disclaimer": "Public third-party update facts; verify independently. The current upstream terms do not expressly grant a commercial redistribution license; confirm commercial rights independently before scaling.",
  "project_count": 0
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quietsignal-l2beat-discovery-feed-e681c560/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 83-29-153-50.sslip.io](https://www.zero.xyz/host/83-29-153-50.sslip.io/llms.txt)