ToolVet
75trust / 100

Perp Carry

by Usenami in Markets & finance

x402 APIPassing, checked 3 h ago

Per-venue funding carry for one crypto perpetual: raw funding_rate, annualized_carry_pct, and contango/backwardation structure from the funding sign. What holding this perp pays or costs you per year, venue by venue, across tracked CEX and DEX venues.

GET https://api.usenami.io/v1/perp/carry

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
555 ms typical, 637 ms slowest 5%
Last check
3 h ago
Next check
any minute now

How to call it

GET https://api.usenami.io/v1/perp/carry

Each call costs $0.005 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/carry?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.

{
  "items": [
    {
      "annualized_carry_pct": 10.95,
      "asset_class": "crypto",
      "funding_interval_hours": 8,
      "funding_rate": 0.0001,
      "mark_price": 64000,
      "structure": "contango",
      "updated_at": "2026-06-26T16:00:00Z",
      "venue": "binance"
    }
  ],
  "methodology": "annualized_carry_pct = funding_rate × (24/funding_interval_hours) × 365 × 100; structure = funding sign (contango/backwardation/flat)",
  "ticker": "BTC",
  "venues_count": 18
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

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/carry?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/carry?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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.usenami.io%2Fv1%2Fperp%2Fcarry
const res = await pay("https://api.usenami.io/v1/perp/carry?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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
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/carry?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
3 h agoPassed402601 ms$0.005
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