ToolVet
75trust / 100

Arbitrage Funding Signal

by Usenami in Markets & finance

x402 APIPassing, checked 4 h ago

Funding-arb SIGNAL for crypto perpetuals — the cross-venue funding spread per pair, set against public round-trip taker fees, with periods-to-breakeven, ranked by the 8h-normalized spread. Liquidity is not assessed: depth sizing was withdrawn on 2026-09-16, so check the books before sizing. A derived outcome, not a profit forecast.

GET
https://api.usenami.io/v1/perp/arbitrage/funding-signal
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
594 ms
698 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/arbitrage/funding-signal

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/arbitrage/funding-signal?limit=1&min_diff=1

Parameters

ParameterTypeRequiredDescription
limitintegerNoMax results. Default 50, max 100.
min_diffnumberNoAbsolute funding spread threshold. Default 0.0001.

Example response

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

{
  "count": 1,
  "methodology": "Gross funding spread against round-trip taker fees; liquidity not assessed.",
  "opportunities": [
    {
      "funding_periods_to_breakeven": 2.5,
      "gross_funding_spread_bps": 8,
      "long_venue": "okx",
      "round_trip_fee_bps": 20,
      "short_venue": "binance",
      "signal_score": 8,
      "ticker": "BTC",
      "updated_at": "2026-06-17T17:03:12Z",
      "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/arbitrage/funding-signal?limit=1&min_diff=1'

# 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/arbitrage/funding-signal?limit=1&min_diff=1' \
  | 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%2Farbitrage%2Ffunding-signal
const res = await pay("https://api.usenami.io/v1/perp/arbitrage/funding-signal?limit=1&min_diff=1");
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/arbitrage/funding-signal?limit=1&min_diff=1")
    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 agoPassed402583 ms$0.005
8 h agoPassed402632 ms$0.005
12 h agoPassed402594 ms$0.005
16 h agoPassed402594 ms$0.005
20 h agoPassed402606 ms$0.005
Show 10 older checks
24 h agoPassed402620 ms$0.005
28 h agoPassed402590 ms$0.005
32 h agoPassed402580 ms$0.005
36 h agoPassed402717 ms$0.005
40 h agoPassed402191 ms$0.005
44 h agoPassed402546 ms$0.005
47 h agoPassed402732 ms$0.005
2 days agoPassed402199 ms$0.005
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2 days agoPassed402571 ms$0.005