f1owOn-Chain Metrics
Total value locked and the fees a chain actually earns, over 24 hours, a week and a month. What the protocol makes, not what it promises.
What it does
On-chain TVL and network fees/revenue (24h/7d/30d) for one chain. Use a chain's own token symbol (e.g. 'ETH', 'SOL', 'BNB') — returns a plain 'not a tracked chain' message for tokens that aren't L1/L2s. Does not cover gas price (gwei).
Parameters
| Name | Type | Description |
|---|---|---|
symbolrequiredpath | string | Chain token symbol, e.g. 'ETH' or 'SOL' |
Call it
One API key works for MCP, REST and WebSocket; each call uses one unit. Agents without an account can pay per call with x402.
curl "https://mcp.f1ow.com/v1/onchain/ETH" \
-H "Authorization: Bearer $F1OW_API_KEY"{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "onchain_metrics",
"arguments": {
"symbol": "ETH"
}
}
}const res = await fetch("https://mcp.f1ow.com/v1/onchain/ETH", {
headers: { Authorization: `Bearer ${process.env.F1OW_API_KEY}` },
});
const data = await res.json(); // the tool's result as JSON, typed in the OpenAPI spec
console.log(data);import os, requests
res = requests.get(
"https://mcp.f1ow.com/v1/onchain/ETH",
headers={"Authorization": f"Bearer {os.environ['F1OW_API_KEY']}"},
)
data = res.json() # the tool's result as JSON, typed in the OpenAPI spec
print(data)// wss://mcp.f1ow.com/v1/ws — subprotocol "jsonrpc-2.0", Authorization: Bearer <key>
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "onchain_metrics",
"arguments": {
"symbol": "ETH"
}
}
}
// Or push a fresh result whenever it changes (minimum interval 15 s)
{
"jsonrpc": "2.0",
"id": 2,
"method": "subscriptions/subscribe",
"params": {
"name": "onchain_metrics",
"arguments": {
"symbol": "ETH"
},
"intervalSeconds": 60
}
}# No account: the first call answers 402 with a PAYMENT-REQUIRED challenge;
# an x402 client pays it in USDC on Base and retries.
curl "https://mcp.f1ow.com/x402/v1/onchain/ETH"Sample response
A real response captured 2026-11-13. JSON is what REST and WebSocket return, and the structuredContent of an MCP call (trimmed for length), with generatedAt for freshness. Text is the report an MCP client hands to a model.
Ethereum — TVL $39.41B | Fees 24h $15.24M (+59.42%) | Fees 7d $72.31M | Fees 30d $409.34M{
"chain": "Ethereum",
"fees24hChangePct": 59.42,
"fees24hUsd": 15243048.05,
"fees30dUsd": 409341447.629998,
"fees7dUsd": 72313312.88,
"tracked": true,
"tvlUsd": 39408009562.0325,
"generatedAt": "2026-11-13T08:05:51.0597959+00:00"
}Related tools
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