Farcaster cast volume

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. Send POST /api/fc-cast-metrics with the required field q and pay $0.005 per call over x402 or MPP (there is no free tier). It returns a JSON object with source, fetchedAt, cached, rateLimit, query and 7 more.

Cached 60 s. Use to chart mention volume for a token, product or event and detect spikes.

Category: Web & documents · Tags: farcaster social metrics volume mentions timeseries

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/fc-cast-metrics \
  -H "Content-Type: application/json" \
  -d '{"q":"x402","interval":"7d"}'

Without payment this returns HTTP 402 Payment Required with the exact price for fc-cast-metrics; any x402 v2 or MPP client pays it and retries.

Example response

{
  "source": "neynar",
  "fetchedAt": "2026-08-22T13:19:12.000Z",
  "cached": false,
  "rateLimit": {
    "limit": 300,
    "remaining": 299,
    "resetAt": "2026-08-22T13:20:00.000Z"
  },
  "query": "x402",
  "interval": "7d",
  "authorFid": null,
  "channel": null,
  "resolutionSeconds": 3600,
  "total": 42,
  "bucketCount": 168,
  "buckets": [
    {
      "start": "2026-08-15T15:00:00.000Z",
      "count": 1
    },
    {
      "start": "2026-08-15T16:00:00.000Z",
      "count": 7
    }
  ]
}

From an MCP client

catalog.call {
  "slug": "fc-cast-metrics",
  "params": {
    "q": "x402",
    "interval": "7d"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for fc-cast-metrics; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• q is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/fc-cast-metrics returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/fc-cast-metrics", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "q": "x402",
    "interval": "7d"
  }),
});

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