Stock quote

End-of-day US equity quote: last close, day range, previous close and the change between them. Send GET /api/stock-quote with the required field symbol and pay $0.001 per call over x402 or MPP (there is no free tier). It returns a JSON object with symbol, currency, price, previousClose, changeAbs and 8 more.

US equities only; indices, FX and crypto are not covered (crypto-price serves those). Built from a three-venue consolidation (Databento DBEQ.BASIC), so the prices track the wider market but the volume counts those three venues only and is returned as venueVolume rather than as a total. No 52-week range and no intraday print: for a date range call stock-history.

Category: Live public data · Tags: finance stocks quote market-data price

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Parameters

Example request

curl -i "https://agent402.tools/api/stock-quote?symbol=AAPL"

Without payment this returns HTTP 402 Payment Required with the exact price for stock-quote; any x402 v2 or MPP client pays it and retries.

Example response

{
  "symbol": "AAPL",
  "currency": "USD",
  "price": 335.5,
  "previousClose": 336.79,
  "changeAbs": -1.29,
  "changePct": -0.383,
  "dayHigh": 338.41,
  "dayLow": 332.545,
  "venueVolume": 1630155,
  "asOf": "2026-09-18",
  "venues": "NYSE Texas (formerly NYSE Chicago), NYSE National, IEX",
  "source": "databento.com DBEQ.BASIC",
  "note": "End-of-day close from a three-venue consolidation. Not a live intraday quote, not consolidated-tape volume, and no 52-week range - use stock-history for a range."
}

From an MCP client

catalog.call {
  "slug": "stock-quote",
  "params": {
    "symbol": "AAPL"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for stock-quote; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• symbol is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/stock-quote is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/stock-quote?symbol=AAPL");

Part of these workflows

Stock quote is one step in these 8 skill packs, each sold as a single call:

• Earnings deep-dive - Everything you need before a company reports: the latest financials, recent SEC filings, the latest close, and fresh analyst news - in one pass.
• Options analytics - Price a European option on a live stock: pull the current quote, estimate volatility from recent history, run Black-Scholes for fair value + the full greeks, and check the news for catalysts.
• Financial analysis - Quick company snapshot: latest close, 9 key financial metrics (revenue through cash flow), and upcoming earnings - one call, one payment.
• Financial research - Pull SEC filings, the latest close, historical prices, and macro context for a single ticker in one pass.
• Cross-asset price monitor - Side-by-side snapshot of a stock and a crypto asset: the equity's latest close against a live crypto quote, a trailing-year series for each, and a date-stamped comparison.
• Company dossier - Comprehensive company research report in one call: latest close, financials, SEC filings, insider trades, and recent news - all in parallel.
• Earnings watch - Has this company just reported, and what is being said about it? Recent SEC filings, the latest close, and current coverage in one call.
• Insider alert - Insider buying/selling activity for a stock: Form 4 trades, the latest close, and recent SEC filings in one call.

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