# Base Agent Preflight – RSS/Atom Feed Snapshot

> Base Agent Preflight – RSS/Atom Feed Snapshot is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Fetches a public RSS or Atom feed URL and returns a structured safety snapshot with risk scoring and flags for autonomous agents.

## Facts

- Endpoint: GET https://base-agent-preflight.bytoken2023.workers.dev/v1/x402/web/feed-snapshot
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-agent-preflight-rss-atom-feed-snapshot-17909cc3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dfZQ-e0dpl7Ifh4aGVdcC

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 base-agent-preflight-rss-atom-feed-snapshot-17909cc3
```

Example prompt: Can you run a safety preflight check on this RSS feed — https://feeds.example.com/posts.xml — and tell me its risk score and any flags before I start ingesting it?

## When to prefer this

Use this endpoint when an autonomous agent needs to preflight-check a public RSS or Atom feed URL for safety and risk before ingesting or subscribing to it, especially in Base/EVM-adjacent workflows where agent safety tooling is required. Prefer over generic HTTP fetch tools when you need structured risk scoring and flag detection specific to feed content.

## Known failure modes

- Invalid or non-public URL returns validation error
- Non-RSS/Atom URL (e.g. plain HTML page) may return parse failure or unexpected assessment
- Timeout if the remote feed server is slow or unreachable
- Malformed feed XML may result in partial or error response
- Missing required 'url' query parameter returns schema validation error

## How this service works

Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.

## Output

A JSON object including the EIP-155 network identifier (eip155:8453 for Base), the product name ('feed-snapshot'), an assessment object with a risk_level (e.g. 'low'), a numeric risk_score, and an array of any flags detected in the feed.

## 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": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "pattern": "^https?://",
       "maxLength": 2048,
       "description": "Public RSS or Atom feed URL."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "network": {
       "type": "string"
      },
      "product": {
       "type": "string"
      },
      "activity": {
       "type": "object"
      },
      "identity": {
       "type": "object"
      },
      "assessment": {
       "type": "object"
      },
      "provenance": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "network": "eip155:8453",
  "product": "feed-snapshot",
  "assessment": {
   "flags": [],
   "risk_level": "low",
   "risk_score": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-agent-preflight-rss-atom-feed-snapshot-17909cc3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from base-agent-preflight.bytoken2023.workers.dev](https://www.zero.xyz/host/base-agent-preflight.bytoken2023.workers.dev/llms.txt)