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Agent402 Farcaster Cast Lookup
x402
Agent402 Farcaster Cast Lookup is a paid API for AI agents from agent402.tools, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Fetch full metadata for a Farcaster cast by hash or Warpcast URL, including author, engagement stats, embeds, and channel.
Price / call$0.003
Success—
StatusUnknown
How this service works
Fetch one Farcaster cast by hash or warpcast.com / farcaster.xyz URL. Returns the compact cast: author (fid, username, follower count), text, timestamp, channel, parent hash, likes, recasts, reply count, embed URLs. Use to resolve a shared link, verify a quote, or enrich a cast hash from another tool.
Output
Returns a JSON object containing the cast's full text, URL, hash, author details (FID, username, display name, follower count), embed list, channel, reply/like/recast counts, timestamp, parent hash, and whether the result was served from cache. Also includes rate limit info and the upstream data source (Neynar).
Example use cases
Monitoring influencer cast engagement
“Fetch the cast at 0x322c451ed6ff1674328c6164b92166b3d15f2b7d on Farcaster and tell me how many likes, recasts, and replies it has so I can see how it's performing.”
Verifying cast content before sharing
“I got sent this Warpcast link — https://warpcast.com/dwr/0x322c451e — can you retrieve the actual text of the cast and confirm who posted it and when?”
Aggregating cast stats for a report
“Look up this Farcaster cast by hash 0x322c451ed6ff1674328c6164b92166b3d15f2b7d and give me the author's username, follower count, and all engagement numbers so I can include them in my weekly social report.”
Technical details
Endpoint
POSThttps://agent402.tools/api/fc-castWhen to prefer
Choose this endpoint when you need to retrieve structured metadata for a specific Farcaster cast by its hash or Warpcast/Farcaster URL, without needing a Neynar API key or any signup — payment is per-call via USDC over x402. Prefer this over direct Neynar API calls when operating as an autonomous agent with a wallet identity, or when you need a frictionless, keyless lookup for one-off or low-volume cast resolution tasks.
Side effects
- Invalid or malformed cast hash returns an error — hash must be 0x followed by 40 hex characters
- Cast not found on Farcaster returns a null or error response
- Rate limit exhausted — the rateLimit.remaining field will show 0 and resetAt indicates when quota refreshes
- Malformed Warpcast URL that doesn't resolve to a valid cast will fail to fetch
- Upstream Neynar API outage may cause fetch failures or delayed responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| 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
},
"cached": false,
"source": "neynar",
"fetchedAt": "2026-08-22T13:19:12.000Z",
"rateLimit": {
"limit": 300,
"resetAt": "2026-08-22T13:20:00.000Z",
"remaining": 299
}
}
}Tags
x402
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