ToolVet
75trust / 100

Perp Vw Spread

by Usenami in Markets & finance

x402 APIPassing, checked 4 h ago

Volume-weighted average funding rate across all tracked venues for one crypto perpetual. Accounts for venue market share — high-volume venues dominate the weighted rate, so it reflects what the market actually pays rather than a flat average across thin and deep venues alike.

GET https://api.usenami.io/v1/perp/vw-spread

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
587 ms typical, 679 ms slowest 5%
Last check
4 h ago
Next check
any minute now

How to call it

GET https://api.usenami.io/v1/perp/vw-spread

Each call costs $0.003 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

Built from the input schema. Replace the values with your own.

GET https://api.usenami.io/v1/perp/vw-spread?ticker=example

Parameters

ParameterTypeRequiredDescription
canonical_idstringNoDisambiguates a ticker that names two unrelated assets; a 409 on the ticker alone names the candidates.
tickerstringYesBase ticker (e.g. BTC, ETH). Required.

Example response

The provider's example. We can't check it without paying.

{
  "simple_avg_rate": 0.0001,
  "ticker": "BTC",
  "top_contributors": [
    {
      "rate": 0.0001,
      "venue": "binance",
      "volume_24h_usd": 5500000000,
      "weight_pct": 49.87
    }
  ],
  "total_volume_24h_usd": 11029446855.42,
  "updated_at": "2026-05-31T17:03:12Z",
  "venues_count": 18,
  "vw_rate": 0.000085
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.usenami.io/v1/perp/vw-spread?ticker=example'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://api.usenami.io/v1/perp/vw-spread?ticker=example' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.usenami.io%2Fv1%2Fperp%2Fvw-spread
const res = await pay("https://api.usenami.io/v1/perp/vw-spread?ticker=example");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.usenami.io/v1/perp/vw-spread?ticker=example")
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
4 h agoPassed402634 ms$0.003
8 h agoPassed402566 ms$0.003
12 h agoPassed402623 ms$0.003
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20 h agoPassed402596 ms$0.003
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31 h agoPassed402191 ms$0.003
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2 days agoPassed402566 ms$0.003
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2 days agoPassed402610 ms$0.003