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NullClear Market Feed
x402
NullClear Market Feed is a paid API for AI agents from api.nullclear.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Returns a verified real-time spot price for a given crypto asset (e.g. ETH) via the NullClear non-custodial protocol on Base Mainnet
Price / call$0.001
Success—
StatusUnknown
How this service works
Non-custodial deferred clearing, deep invariant validation, and reputation protocol for x402 AI Agents on Base Mainnet
Output
A JSON object containing the asset trading pair (e.g. 'ETH/USDC'), the current spot price as a float, the named price source ('NullClear Verified Feed'), and a millisecond-precision Unix timestamp of when the price was recorded.
Example use cases
Real-time ETH price for DeFi bot
“What's ETH trading at right now? I need the verified spot price with a timestamp for my automated trading logic.”
Pre-trade price check for agent
“Before executing this swap, fetch the current ETH/USDC price from a verified source so I can confirm the rate looks right.”
Price monitoring alert system
“Grab the latest verified ETH price from NullClear and let me know if it's moved more than 5% from the last value you fetched.”
Technical details
Endpoint
GEThttps://api.nullclear.dev/v1/sandbox/market-feed?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent needs a cryptographically sourced, source-attributed spot price for a crypto asset — particularly within x402-compatible workflows on Base Mainnet where trust, auditability, and non-custodial guarantees matter. Prefer it over generic price APIs when you need a verifiable source label and millisecond timestamp alongside the price.
Side effects
- Invalid or unsupported asset symbol returns an error or empty result
- Payment failure (x402 micropayment not completed) results in 402 response blocking data
- Network or API downtime returns a 5xx error with no price data
- Stale price if upstream feed is delayed — timestamp should be checked by the caller
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| asset | string |
Output
Schema · Response
{
"type": "json",
"example": {
"asset": "ETH/USDC",
"price": 2645.5,
"source": "NullClear Verified Feed",
"timestamp": 1729045678901
}
}Tags
x402
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