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Bitcoin Fee Forecast API
x402
Bitcoin Fee Forecast API is a paid API for AI agents from api.relai.fi, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Returns a predictive forecast of Bitcoin transaction fees
Price / call$0.005
Success—
StatusUnknown
How this service works
Bitcoin fee forecast
Output
A predicted Bitcoin fee estimate, likely including recommended fee rates (e.g. sat/vByte) for different confirmation speed tiers (fast, medium, slow) based on current mempool and network conditions.
Example use cases
Example prompt
“What are the predicted Bitcoin transaction fees right now — I want to know the forecast so I can decide whether to send my transaction immediately or wait for lower fees.”
Technical details
Endpoint
GEThttps://api.relai.fi/relay/1780781322365/api/fees/predictWhen to prefer
Use this endpoint when you need a forward-looking Bitcoin fee prediction rather than just the current mempool snapshot. Ideal for wallets, payment processors, or agents deciding when to broadcast a Bitcoin transaction to optimize cost vs. confirmation speed.
Side effects
- Bitcoin node unavailable or syncing — may return 503 or empty data
- Mempool data stale or unavailable — forecast may be inaccurate
- Rate limit exceeded — returns 429
- Payment not provided or invalid — returns 402 Payment Required
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"unit": "sat/vB",
"current": {
"low": 2,
"high": 6,
"medium": 4
},
"mempool": {
"size_mb": "21.72",
"congestion": "low",
"pending_tx": 88168
},
"success": true,
"prediction": {
"trend": "rising",
"confidence_pct": 95
},
"updated_at": "2026-06-12T04:31:05.328Z",
"next_3_blocks": {
"block_1": 6,
"block_2": 3,
"block_3": 2
}
}Tags
x402
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