ToolVet
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Metrics Vpin

by api.dripmetrics.ai in Markets & finance

x402 APIPassing, checked 4 h ago

DripMetricsAI (api description at https://dripmetrics.ai/) provides on-demand market microstructure and risk metrics for agents and developers. Agents can pay per request via x402 and receive structured JSON metrics without subscriptions or API keys. VPIN measures volume-synchronized order-flow imbalance (an adverse-selection proxy, not a probability); see excessVpin. Discovery examples use the latest 30m window.

GET
https://api.dripmetrics.ai/metrics/vpin
Price
$0.05
per call in USDC
Uptime
100%
last 30 days
Response time
1.3 s
1.8 s 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 · Watch with other listings

How to call it

GET https://api.dripmetrics.ai/metrics/vpin

Each call costs $0.05 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://api.dripmetrics.ai/metrics/vpin?exchange=coinbase&pair=BTC-USD&window=30m

Parameters

ParameterTypeRequiredDescription
exchangestringYesExchange adapter to source recent trades from. One of: binance, coinbase, hyperliquid.
pairstringYesExchange-native trading pair symbol such as BTCUSDT, ETH-USD, BTC, or xyz:TSLA.
windowstringYesLookback window. Hyperliquid supports 30m and 1h; 2h and 3h are currently BTCUSDT/BTC-USD only. One of: 30m, 1h, 2h, 3h.

Example response

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

Example response, 37 lines
{
  "components": {
    "bucketSize": 5,
    "buckets": 20,
    "buyTrades": 50,
    "buyVolume": 50,
    "estimatedNullVpin": 0.35682482,
    "excessVpin": -0.15682482,
    "meanImbalance": 1,
    "meanTradeContributionsPerBucket": 5,
    "minimumTradeContributionsPerBucket": 5,
    "minimumTradeCount": 100,
    "oneSidedBuckets": 0,
    "sellTrades": 50,
    "sellVolume": 50,
    "targetBuckets": 20,
    "totalVolume": 100,
    "tradeCount": 100
  },
  "computedAt": "2026-05-23T14:00:00.000Z",
  "coverage": {
    "completeFetch": true,
    "coverageRatio": 1,
    "effectiveWindowMinutes": 30,
    "errorMessage": null,
    "partialData": false,
    "requestedWindowMinutes": 30
  },
  "exchange": "coinbase",
  "firstTradeTime": "2026-05-23T13:00:02.000Z",
  "lastTradeTime": "2026-05-23T13:59:58.000Z",
  "metric": "vpin",
  "pair": "BTC-USD",
  "tradeCount": 100,
  "value": 0.2,
  "window": "30m"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.05.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.dripmetrics.ai/metrics/vpin?exchange=coinbase&pair=BTC-USD&window=30m'

# 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.dripmetrics.ai/metrics/vpin?exchange=coinbase&pair=BTC-USD&window=30m' \
  | 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 $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
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 $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.dripmetrics.ai%2Fmetrics%2Fvpin
const res = await pay("https://api.dripmetrics.ai/metrics/vpin?exchange=coinbase&pair=BTC-USD&window=30m");
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 $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
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.dripmetrics.ai/metrics/vpin?exchange=coinbase&pair=BTC-USD&window=30m")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
4 h agoPassed4021.5 s$0.05
9 h agoPassed402376 ms$0.05
13 h agoPassed4021.3 s$0.05
18 h agoPassed4021.1 s$0.05
23 h agoPassed402995 ms$0.05
Show 10 older checks
28 h agoPassed402698 ms$0.05
32 h agoPassed402562 ms$0.05
37 h agoPassed402380 ms$0.05
41 h agoPassed4021.3 s$0.05
45 h agoPassed4021.6 s$0.05
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3 days agoPassed4021.6 s$0.05
3 days agoPassed402398 ms$0.05