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Farcaster Cast Replies Fetcher
x402
Farcaster Cast Replies Fetcher 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).
Fetches threaded replies to a Farcaster cast by hash or URL, with pagination, depth control, and sort order options.
Price / call$0.005
Success—
StatusUnknown
How this service works
The reply thread under a Farcaster cast (by hash or URL): the root cast plus replies flattened with their depth (1-5 levels) and parent hash, in chronological, newest-first or algorithmic order. Compact cast shape. Use to read reactions to an announcement, summarize a discussion, or trace who replied to whom.
Output
Returns the original cast's metadata (text, author, reactions, reply count, timestamp), a sorted and paginated list of reply objects (each with hash, text, author FID/username/follower count, embeds, reactions, timestamps, depth, and parent hash), plus pagination state (nextCursor), cache status, data source (Neynar), fetch timestamp, and current rate limit info.
Example use cases
Monitor engagement on a viral cast
“Pull all direct replies to this Farcaster cast hash 0x322c451ed6ff1674328c6164b92166b3d15f2b7d, sorted chronologically, up to 50 per page — I want to track the conversation as it grows.”
Analyze nested reply threads
“Get replies 2 levels deep on this Warpcast post https://warpcast.com/dwr/0x322c451e, sorted by newest first, limit 20 — I want to see the sub-conversations happening in the thread.”
Page through large reply set
“I already fetched the first page of replies for cast 0x322c451e and got a nextCursor back — can you fetch the next page using that cursor with the same chronological sort and limit of 20?”
Technical details
Endpoint
POSThttps://agent402.tools/api/fc-cast-repliesWhen to prefer
Use this endpoint when you need to retrieve threaded conversation data for a specific Farcaster cast — including author metadata, reaction counts, and nested replies — with control over sort order, depth, and pagination. Prefer this over generic social APIs when working with Farcaster/Warpcast content specifically, and when you need pay-per-call access without API key signup.
Side effects
- Invalid or malformed cast hash returns an error — must be 0x + 40 hex chars
- Cast not found on Farcaster network returns empty or 404-style response
- Rate limit exceeded (300 req/min window) returns rate limit error
- Invalid cursor string causes pagination failure
- Depth value outside 1–5 range is rejected by schema validation
- Neynar upstream outage causes delayed or failed response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| sort | string | Reply order (default chron). |
| depth | integer | Reply depth to include (default 1 = direct replies). |
| limit | integer | Direct replies per page (default 20). |
| cursor | string | Opaque pagination cursor from a previous call's nextCursor. |
| identifier | string | Cast hash (0x + 40 hex) or an https warpcast.com / farcaster.xyz cast URL. |
Output
Schema · Response
{
"type": "json",
"example": {
"cast": {
"url": "https://warpcast.com/dwr/0x322c451e",
"hash": "0x322c451ed6ff1674328c6164b92166b3d15f2b7d",
"text": "quick let's all open up fc app to cast about fc dead",
"author": {
"fid": 3,
"username": "dwr",
"displayName": "Dan Romero",
"followerCount": 630338
},
"embeds": [],
"channel": null,
"replies": 50,
"reactions": {
"likes": 196,
"recasts": 28
},
"timestamp": "2026-08-20T00:58:40.000Z",
"parentHash": null
},
"sort": "chron",
"count": 1,
"depth": 1,
"cached": false,
"source": "neynar",
"replies": [
{
"url": "https://warpcast.com/askew-ai/0xab5aca84",
"hash": "0xab5aca846db8af6fa3dc2d25dc66171cd040def4",
"text": "Paid an x402 endpoint for the first time today.",
"depth": 1,
"author": {
"fid": 3117427,
"username": "askew-ai",
"displayName": "askew-ai",
"followerCount": 12
},
"embeds": [
"https://example.com/post"
],
"channel": null,
"replies": 2,
"reactions": {
"likes": 4,
"recasts": 1
},
"timestamp": "2026-08-22T12:49:27.000Z",
"parentHash": "0x322c451ed6ff1674328c6164b92166b3d15f2b7d"
}
],
"fetchedAt": "2026-08-22T13:19:12.000Z",
"rateLimit": {
"limit": 300,
"resetAt": "2026-08-22T13:20:00.000Z",
"remaining": 299
},
"nextCursor": null
}
}Tags
x402
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