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HARS-Zero Signal API – Live FX Rate Lookup
x402
HARS-Zero Signal API – Live FX Rate Lookup is a paid API for AI agents from hars.cryptotavern.xyz, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Returns a live foreign exchange rate for a currency pair, including a 24-hour sparkline, confidence score, and inverse rate, paid per call in USDC via x402.
Price / call$0.005
Success—
StatusUnknown
How this service works
Utility API for AI agents — fetch URLs, extract structured HTML, summarize text, get live FX rates, and geocode addresses. Pay per call in USDC on Base or Solana via x402. No API keys, no subscriptions. Sub-cent pricing optimized for high-volume agent loops.
Output
Returns a JSON object with the from/to currency codes, the live exchange rate as a float, the inverse rate, an RFC3339 timestamp for the rate, an optional 24-hour sparkline array of prices, a confidence score (0–1), a list of risk factors, evidence URLs (e.g. Polymarket reference links), the converted amount if an input amount was provided, and an optional next_best_action suggestion for follow-up calls.
Example use cases
Real-time currency conversion for invoicing
“I need to invoice a client in Japan — what's the live JPY to USD rate right now so I can convert the 250,000 JPY amount correctly?”
FX trend check before a wire transfer
“Before I send €10,000 to a UK account, can you check the live EUR to GBP rate and show me the 24-hour sparkline so I know if the rate has moved a lot today?”
Multi-currency portfolio monitoring
“Get me the current exchange rates from USD to CAD, AUD, and CHF, including confidence scores and any risks flagged for each pair.”
Technical details
Endpoint
GEThttps://hars.cryptotavern.xyz/paid/fxWhen to prefer
Choose this endpoint when your agent needs a live, pay-per-call FX rate with no API key setup, especially in high-volume loops where sub-cent per-call pricing matters. It is ideal for autonomous agents that already use x402/USDC micropayments on Base or Solana, and need a 24-hour sparkline or confidence score alongside the raw rate rather than a bare number from a free tier.
Side effects
- Unsupported or malformed currency codes return an error or empty rate
- Payment failure via x402 (insufficient USDC balance or unsupported chain) results in a 402 response with no data
- Stale or low-confidence rates may be returned during market closure or data source outages, indicated by a low confidence score
- Missing required 'from' or 'to' parameters cause a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| torequired | string | |
| fromrequired | string | |
| raterequired | number | |
| as_ofrequired | string | RFC3339 timestamp |
| risks | array | |
| amount | number | |
| source | string | |
| product | string | |
| evidence | array | Polymarket order book / event / reference URLs |
| sparkline | array | |
| confidence | number | Model confidence 0.0-1.0 |
| market_ids | array | Polymarket slugs or ids referenced in this response |
| inverse_rate | number | |
| converted_amount | number | |
| next_best_action | object |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| torequired | string | |
| fromrequired | string | |
| raterequired | number | |
| as_ofrequired | string | RFC3339 timestamp |
| risks | array | |
| amount | number | |
| source | string | |
| product | string | |
| evidence | array | Polymarket order book / event / reference URLs |
| sparkline | array | |
| confidence | number | Model confidence 0.0-1.0 |
| market_ids | array | Polymarket slugs or ids referenced in this response |
| inverse_rate | number | |
| converted_amount | number | |
| next_best_action | object |
Tags
x402
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