ToolVet
75trust / 100

Perp Funding Flips

by Usenami in Markets & finance

x402 APIPassing, checked 4 h ago

Funding-rate sign-change detection for one crypto perpetual — every positive↔negative flip across venues inside a lookback window, each with its venue, hour and the rates either side of the change. Raw events for spotting funding-regime turns in funding-arb and carry positioning: it reports the flips, it does not classify them as sustained or transient.

GET
https://api.usenami.io/v1/perp/funding-flips
Price
$0.003
per call in USDC
Uptime
100%
last 30 days
Response time
595 ms
730 ms slowest 5%
Last check
Passed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

How to call it

GET https://api.usenami.io/v1/perp/funding-flips

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/funding-flips?ticker=example

Parameters

ParameterTypeRequiredDescription
hoursintegerNoLookback hours. Default 24, max 168.
tickerstringYesBase ticker (e.g. BTC, ETH). Required.

Example response

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

{
  "flips": [
    {
      "direction": "positive_to_negative",
      "hour": "2026-05-31T08:00:00Z",
      "rate_after": -0.00005,
      "rate_before": 0.0001,
      "venue": "binance"
    }
  ],
  "flips_count": 2,
  "hours": 24,
  "ticker": "BTC",
  "venues_with_flips": 2
}

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/funding-flips?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/funding-flips?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%2Ffunding-flips
const res = await pay("https://api.usenami.io/v1/perp/funding-flips?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/funding-flips?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 agoPassed402580 ms$0.003
8 h agoPassed402565 ms$0.003
12 h agoPassed402549 ms$0.003
16 h agoPassed402699 ms$0.003
20 h agoPassed402632 ms$0.003
Show 10 older checks
24 h agoPassed402636 ms$0.003
28 h agoPassed402617 ms$0.003
32 h agoPassed402644 ms$0.003
35 h agoPassed402730 ms$0.003
39 h agoPassed402611 ms$0.003
42 h agoPassed402578 ms$0.003
46 h agoPassed402570 ms$0.003
2 days agoPassed402646 ms$0.003
2 days agoPassed402666 ms$0.003
2 days agoPassed402584 ms$0.003