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4SEC Crypto Market Data API — Real-Time Prices
x402
4SEC Crypto Market Data API — Real-Time Prices is a paid API for AI agents from api.foursec.xyz, paid per call via x402, $0.005/call, status down (last checked 2026-09-15).
Fetches real-time aggregated cryptocurrency price data from multiple DEXes in a single request, paid per-call via USDC on Base.
Price / call$0.005
Success—
StatusDown
How this service works
Real-time multi-DEX aggregated crypto market data. Pay per request with USDC on Base via x402 protocol.
Output
Returns a data object keyed by token/asset identifier, where each entry includes the current price (number), the source DEX or exchange (string), and the 24-hour percentage price change (number). A metadata object accompanies the data with request context.
Example use cases
Real-time DeFi portfolio valuation
“Can you pull the current prices for ETH, WBTC, and LINK from 4SEC so I can see what my DeFi portfolio is worth right now?”
Token price alert monitoring
“Check the current price of ARB on 4SEC and tell me if it's moved more than 5% in the last 24 hours — I want to know if I should rebalance.”
DEX arbitrage opportunity check
“Get me the latest prices and 24h changes for UNI and AAVE from 4SEC's multi-DEX data so I can spot any arbitrage gaps between exchanges.”
Technical details
Endpoint
GEThttps://api.foursec.xyz/api/v1/pricesWhen to prefer
Choose this endpoint when you need real-time, multi-DEX aggregated crypto prices with on-chain micropayment settlement via x402/USDC on Base. It is especially suited for DeFi-native agents that already operate with crypto wallets and want pay-per-request pricing without API key subscription overhead. Prefer alternatives for CEX (centralized exchange) price data or if you need order book depth, OHLCV candles, or historical time series.
Side effects
- Payment not sent or insufficient USDC — 402 Payment Required response
- Invalid or unrecognized token symbol — empty data object or 404
- Rate limiting or upstream DEX data unavailability — 503 or timeout
- Malformed query parameters — 400 Bad Request
- Network issues on Base chain affecting payment settlement
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "object",
"example": {
"data": {
"type": "object",
"additionalProperties": {
"type": "object",
"properties": {
"price": {
"type": "number"
},
"source": {
"type": "string"
},
"change_24h": {
"type": "number"
}
}
}
},
"meta": {
"type": "object"
}
}
}Tags
x402
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