# Agent Buyer Identity Preflight | x402 Purchase Governance (QuickNode Wallet Execution Readiness)

> Agent Buyer Identity Preflight | x402 Purchase Governance (QuickNode Wallet Execution Readiness) is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Performs a pre-purchase risk and identity check on an Ethereum wallet address to assess whether an AI agent is eligible to buy x402-gated QuickNode wallet-execution APIs or tools.

## Facts

- Endpoint: GET https://base-agent-preflight.bytoken2023.workers.dev/v1/x402/quicknode/wallet-execution-readiness
- Price: $0.05/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-purchase-governance-quicknode-25472299
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CL3CNJT-S_f6zYRzr9IxJ

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-purchase-governance-quicknode-25472299
```

Example prompt: Before my agent buys the QuickNode wallet-execution-readiness API through x402, run a preflight identity check on wallet address 0xAbC1234567890abcdef1234567890abcdef123456 to make sure it's low-risk and approved.

## When to prefer this

Choose this endpoint when an AI agent needs a lightweight, fast governance check before executing an x402 micropayment for a QuickNode-specific wallet-execution API. Prefer it over generic wallet screening tools when operating in the x402 ecosystem on Base (EIP-155:8453) and when the product category is QuickNode wallet execution readiness. Best used as a pre-flight gate in automated agent purchasing pipelines to enforce spend policies without requiring human approval.

## Known failure modes

- Invalid or malformed Ethereum address (not matching ^0x[a-fA-F0-9]{40}$) returns a 400 or validation error
- Wallet address not found or no on-chain history results in limited assessment data
- Service unavailable or Cloudflare Worker timeout returns 5xx
- Missing required 'address' query parameter causes request rejection
- High-risk wallet returns elevated risk_score and populated flags array, potentially blocking purchase

## 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 (e.g. eip155:8453 for Base), product identifier (quicknode-wallet-execution-readiness), and an assessment object with a risk_level (e.g. 'low'), numeric risk_score, and an array of flags. May also include identity and provenance sub-objects with additional wallet metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$"
      },
      "gas_limit": {
       "type": "string",
       "pattern": "^[0-9]+$"
      }
     }
    }
   },
   "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-wallet-execution-readiness",
  "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-purchase-governance-quicknode-25472299/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)