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Agent402 Farcaster Cast Metrics
x402
Agent402 Farcaster Cast Metrics is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Search Farcaster casts by keyword, channel, or author and return time-bucketed engagement counts over a configurable lookback window
Price / call$0.005
Success—
StatusUnknown
How this service works
Cast volume over time for a search query: how many Farcaster casts matched per bucket across the last 1d, 7d, 30d, 90d or 180d (hourly or daily buckets), optionally limited to one author or channel, plus the total. Cached 60 s. Use to chart mention volume for a token, product or event and detect spikes.
Output
Returns a JSON object containing the total number of matching casts, an array of time buckets (each with a start timestamp and count), the query parameters echoed back (query, channel, interval, authorFid), the data source (Neynar), whether the result was cached, the fetch timestamp, bucket resolution in seconds, bucket count, and current rate-limit state (limit, remaining, resetAt).
Example use cases
Track crypto protocol buzz on Farcaster
“Search Farcaster for 'Base L2' mentions over the past 7 days and show me how the cast volume trended hour by hour.”
Monitor a specific channel's activity
“How active has the /dev channel on Farcaster been over the last 30 days? Give me the total cast count and hourly breakdown.”
Measure a specific user's posting frequency
“How many casts has Farcaster user with FID 3 posted in the last 90 days, and what does their daily posting pattern look like?”
Technical details
Endpoint
POSThttps://agent402.tools/api/fc-cast-metricsWhen to prefer
Choose this endpoint when you need time-series cast volume data from Farcaster — particularly for trend analysis, keyword monitoring, channel activity tracking, or per-author posting frequency. It is backed by Neynar and returns pre-bucketed hourly data, making it ideal for charting and alerting workflows. Prefer this over generic social listening tools when your target platform is specifically Farcaster/Warpcast and you need structured, pageable metrics rather than raw cast content.
Side effects
- Query string exceeds 256 characters returns a validation error
- Invalid or non-existent channel ID returns empty results or error
- Invalid interval enum value returns a 400 bad request
- Rate limit exceeded (300 calls/minute) returns a 429 with resetAt timestamp
- Neynar upstream outage may cause delayed or failed responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| q | string | Search text (1-256 chars). |
| channel | string | Only casts in this channel id. |
| interval | string | Lookback window (default 7d). |
| authorFid | integer | Only casts by this fid. |
Output
Schema · Response
{
"type": "json",
"example": {
"query": "x402",
"total": 42,
"cached": false,
"source": "neynar",
"buckets": [
{
"count": 1,
"start": "2026-08-15T15:00:00.000Z"
},
{
"count": 7,
"start": "2026-08-15T16:00:00.000Z"
}
],
"channel": null,
"interval": "7d",
"authorFid": null,
"fetchedAt": "2026-08-22T13:19:12.000Z",
"rateLimit": {
"limit": 300,
"resetAt": "2026-08-22T13:20:00.000Z",
"remaining": 299
},
"bucketCount": 168,
"resolutionSeconds": 3600
}
}Tags
x402
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