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Liminal Spot Prices – FX Rate
x402
Liminal Spot Prices – FX Rate is a paid API for AI agents from x402-spot-prices.hsharmanov02.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).
Returns live fiat currency exchange rate snapshots (e.g. USD to EUR) sourced from open.er-api.com, paid per-request via x402 at $0.01 USDC.
Price / call$0.01
Success—
StatusUnknown
How this service works
Live crypto spot-price snapshots (USD) and fiat FX spot rates. Pay-per-request via x402 v2: $0.01 USDC on Base, Monad, Arbitrum, Optimism, Polygon, Avalanche or Solana (eip155:8453), Monad (eip155:143), Arbitrum (eip155:42161), Optimism (eip155:10), Polygon (eip155:137), Avalanche (eip155:43114) or Solana, scheme exact (EIP-3009). Unpaid calls return HTTP 402 with a base64 PAYMENT-REQUIRED header; retry with a PAYMENT-SIGNATURE header.
Output
A JSON object containing the source currency (from), target currency (to), the current spot exchange rate (rate), the inverse rate (inverse_rate), a Unix timestamp of when the rate was recorded (as_of), the data source (open.er-api.com), and the service identifier (fx-rate).
Example use cases
Real-time invoice currency conversion
“My invoice is in USD but I need to display the amount in EUR for a European client — what's the current USD to EUR spot rate?”
Travel budget FX check
“I'm budgeting a trip to Japan — what's the live exchange rate from USD to JPY right now?”
Live FX rate feed for trading dashboard
“Fetch the current GBP to USD spot rate including the inverse rate so I can update my forex dashboard.”
Technical details
Endpoint
GEThttps://x402-spot-prices.hsharmanov02.workers.dev/fx?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-use real-time fiat FX spot rate without a subscription, especially in x402-enabled agent pipelines on EVM-compatible chains or Solana. It is ideal for cost-sensitive agents that only occasionally need currency rates and want to avoid monthly API key commitments.
Side effects
- HTTP 402 returned with base64 PAYMENT-REQUIRED header if no payment signature is provided — must retry with PAYMENT-SIGNATURE header
- Invalid or unsupported currency codes may return an error or empty response
- Rate staleness if upstream open.er-api.com data is delayed
- Network errors from the Cloudflare Worker host
Output
Schema · Response
{
"type": "json",
"example": {
"to": "EUR",
"from": "USD",
"rate": 0.9214,
"as_of": 1759099200,
"source": "open.er-api.com",
"service": "fx-rate",
"inverse_rate": 1.0853
}
}Tags
x402
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