# Base Wallet Activity Delta

> Base Wallet Activity Delta is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-13).

Returns recent transfer activity and risk assessment for a Base wallet address since a specified timestamp

## Facts

- Endpoint: GET https://base-agent-preflight.bytoken2023.workers.dev/v1/x402/base/wallet-activity-delta
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-wallet-activity-delta-598c4ec9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_An54alWMv1nPmAgWd3vYB

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-wallet-activity-delta-598c4ec9
```

Example prompt: Can you check the wallet activity and risk level for Base address 0x1234...abcd since January 1, 2025 — I want to see any recent transfers and whether there are any flags or risks?

## When to prefer this

Use this endpoint when you need to monitor recent on-chain transfer activity for a specific Base wallet address combined with an automated risk assessment. Prefer this over generic blockchain explorers when you need machine-readable risk scoring and flags suitable for autonomous agent decision-making, particularly before executing payments or interactions with an unknown wallet.

## Known failure modes

- Invalid wallet address format (not 0x + 40 hex chars) returns validation error
- Invalid or malformed ISO 8601 timestamp returns schema error
- Wallet with no activity since the given timestamp returns empty activity object
- Rate limiting or payment failure returns 402 or 429 error
- Network unavailable returns 5xx 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

Returns a JSON object with network identifier (eip155:8453), product name, activity object with transfer details, identity and provenance info, and an assessment containing a list of flags, a risk_level string (e.g. 'low'), and a numeric risk_score.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address",
      "since"
     ],
     "properties": {
      "since": {
       "type": "string",
       "pattern": "^\\d{4}-\\d{2}-\\d{2}T.+Z$",
       "description": "Return transfers observed at or after this timestamp."
      },
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$",
       "description": "Base wallet to monitor."
      }
     }
    }
   },
   "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": "base-wallet-activity-delta",
  "assessment": {
   "flags": [],
   "risk_level": "low",
   "risk_score": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-wallet-activity-delta-598c4ec9/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)