ToolVet
81trust / 100

Services Carry Cost

by x402.presenceoperations.com in Other

x402 APIPassing, checked 1 h ago

What it costs to hold a perpetual position: the venue's current hourly funding signed for your side, projected over your horizon in your own units, with the mark-to-oracle basis, open interest, and the assumption behind the projection stated rather than implied.

GET
https://x402.presenceoperations.com/services/carry-cost
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
209 ms
340 ms slowest 5%
Last check
Passed
1 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://x402.presenceoperations.com/services/carry-cost

Each call costs $0.01 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

From the listing.

GET https://x402.presenceoperations.com/services/carry-cost?hours=8&market=BTC-PERP&notional=1000&side=LONG

Parameters

ParameterTypeRequiredDescription
hoursnumberNothe holding horizon to project over; bounded because funding resets hourly and a projection past a month is a number with the shape of an answer and none of the content Default: "8".
marketstringYesthe perpetual market to price the carry of, upper-cased before matching, for example BTC-PERP
notionalnumberYesthe position size to price the funding on, in quote currency
sidestringNowhich side of the funding you are on; the two answers have opposite signs, so anything outside LONG or SHORT is refused rather than read as the default One of: LONG, SHORT. Default: "LONG".

Example response

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

{
  "annualisedRateBasisPoints": 0,
  "assumption": "",
  "basisBasisPoints": 0,
  "detail": "",
  "direction": "",
  "fundingPerHour": "",
  "hourlyFundingRate": "",
  "hours": 0,
  "markPrice": "",
  "market": "",
  "notional": 0,
  "observedAt": "",
  "openInterest": "",
  "oraclePrice": "",
  "projectedFundingOverHorizon": "",
  "side": ""
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://x402.presenceoperations.com/services/carry-cost?hours=8&market=BTC-PERP&notional=1000&side=LONG'

# 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://x402.presenceoperations.com/services/carry-cost?hours=8&market=BTC-PERP&notional=1000&side=LONG' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402.presenceoperations.com%2Fservices%2Fcarry-cost
const res = await pay("https://x402.presenceoperations.com/services/carry-cost?hours=8&market=BTC-PERP&notional=1000&side=LONG");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://x402.presenceoperations.com/services/carry-cost?hours=8&market=BTC-PERP&notional=1000&side=LONG")
    print(res.status_code, res.text)

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