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Nomos ETH/USD Value Assessment API
x402
Nomos ETH/USD Value Assessment API is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Returns the current ETH/USD exchange rate with associated risk assessment, network metadata, and risk scoring via a pay-per-request preflight API.
Price / call$0.002
Success—
StatusUnknown
How this service works
Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.
Output
A JSON object containing the network identifier (e.g. eip155:8453 for Base), the product name ('nomos-value-eth-usd'), and an assessment object with a risk_score (numeric), risk_level (e.g. 'low'), and a flags array (empty when clean). Optionally includes activity, identity, and provenance objects depending on the request.
Example use cases
Pre-trade ETH price risk check
“Before my agent executes a swap, fetch the current ETH/USD price from Nomos and tell me the risk level and any flags so I know the rate looks clean.”
ETH portfolio valuation with safety score
“I have 3.5 ETH — what's its current USD value and is the price feed flagged as low risk right now?”
Agent decision gate on ETH price
“My agent needs to decide whether to proceed with a payment — can you pull the current ETH/USD rate and confirm the risk score is low before it moves forward?”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/x402/v1/value/eth-usdWhen to prefer
Choose this endpoint when an AI agent needs a risk-assessed, network-aware ETH/USD price feed — particularly for preflight checks before on-chain transactions or agent-executed payments on Base. It is distinct from bare price APIs because it bundles a risk score and flags alongside the price, making it suitable for autonomous decision gates rather than just display.
Side effects
- Invalid amount format (non-numeric or negative) returns 400 with validation error
- Missing or failed x402 payment returns 402 Payment Required
- Network or Cloudflare Worker downtime returns 503
- Price feed unavailability may return 503 or a stale/error response
- Malformed query parameter (e.g. amount with too many decimal places) returns 400
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "nomos-value-eth-usd",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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