# Flow Smart-Wallet Buy Signal Feed

> Flow Smart-Wallet Buy Signal Feed is a paid API for AI agents from flow-kg4x.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Returns a chronological stream of recent buy signals from tracked Base smart-wallets plus social-velocity spikes, supporting incremental polling via timestamp or block number.

## Facts

- Endpoint: GET https://flow-kg4x.vercel.app/api/signals?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/flow-smart-wallet-buy-signal-feed-b67defb8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Meqx9QR2IB6yczth7nRTp

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 flow-smart-wallet-buy-signal-feed-b67defb8
```

Example prompt: Pull any new smart-wallet buy signals on Base that have come in since my last check at unix timestamp 1717200000 — I want the wallet addresses, tokens, block numbers, and signal scores for everything that's new.

## When to prefer this

Use this endpoint when an agent needs to incrementally poll for fresh on-chain buy signals from tracked smart wallets on Base, especially when continuity across calls matters (via the since parameter). Prefer it over generic blockchain explorers or social sentiment APIs when you specifically want pre-scored, labeled buy signals with social-velocity context in a single feed, without building your own wallet tracker.

## Known failure modes

- Invalid or future timestamp in since parameter returns empty or error response
- Missing payment header results in 402 Payment Required
- Malformed since value (non-numeric) may cause 400 Bad Request
- No new signals since the given timestamp returns an empty array
- Rate limiting or upstream Base node lag may delay freshness of signals

## How this service works

Use when an agent is polling for fresh smart-wallet buy signals on Base and needs only what's new since its last check. Flow signal feed: the chronological stream behind the smart-wallet tracker — recent buy signals from tracked Base wallets plus social-velocity spikes, newest first, each with timestamp, block number, wallet, token, and a labeled signal score. Supports incremental polling via ?since=<unix timestamp or block number>.

## Output

A chronological array of buy signal events, each containing a timestamp, block number, wallet address, token identifier, signal type label (buy signal or social-velocity spike), and a numeric signal score. Results are ordered newest first and scoped to entries newer than the provided since parameter.

## 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": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/flow-smart-wallet-buy-signal-feed-b67defb8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from flow-kg4x.vercel.app](https://www.zero.xyz/host/flow-kg4x.vercel.app/llms.txt)