# Agent Buyer Identity Preflight – x402 QuickNode RPC Health Check

> Agent Buyer Identity Preflight – x402 QuickNode RPC Health Check is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.025/call, status unknown (last checked 2026-09-14).

Performs a pre-purchase governance check on the QuickNode RPC health endpoint to assess risk level and buyer-role fit before an AI agent pays for it via x402.

## Facts

- Endpoint: GET https://base-agent-preflight.bytoken2023.workers.dev/v1/x402/quicknode/rpc-health
- Price: $0.025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-buyer-identity-preflight-x402-quicknode-rpc-health-check-4a32ad92
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PECv3P3dNNmKjVWXOlcLK

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 agent-buyer-identity-preflight-x402-quicknode-rpc-health-check-4a32ad92
```

Example prompt: Before you pay for the QuickNode RPC health endpoint on Base network using x402, run a preflight check to see if my agent buyer role is approved for this product and what the risk score is.

## When to prefer this

Use this endpoint when an AI agent needs to perform a pre-purchase governance check specifically for the QuickNode RPC health product on the Base (eip155:8453) network before committing an x402 USDC micropayment. Prefer it over generic identity or payment endpoints when you need a structured risk score and policy-flag assessment tied to a specific x402 product category and buyer role.

## Known failure modes

- Missing or malformed endpoint_url query parameter returns a validation error
- endpoint_url does not match https?:// pattern causes schema rejection
- Product or endpoint not recognized in x402 catalog may return unknown product error
- Network unreachable or Cloudflare Worker timeout returns 5xx
- Buyer identity not resolvable may yield elevated risk_score or flags without blocking

## 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

Returns a JSON object containing the network identifier (e.g. eip155:8453), the product name (e.g. quicknode-rpc-health), and an assessment object with a risk_level (e.g. 'low'), a numeric risk_score, and an array of flags indicating any governance concerns. Optionally includes identity, activity, and provenance sub-objects.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "endpoint_url"
     ],
     "properties": {
      "methods": {
       "type": "string",
       "pattern": "^[A-Za-z0-9_.,:-]{1,300}$"
      },
      "endpoint_url": {
       "type": "string",
       "pattern": "^https?://",
       "maxLength": 2048
      }
     }
    }
   },
   "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": "quicknode-rpc-health",
  "assessment": {
   "flags": [],
   "risk_level": "low",
   "risk_score": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-buyer-identity-preflight-x402-quicknode-rpc-health-check-4a32ad92/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)