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Satoshi API - Bitcoin Fee Intelligence (Current Fees)
x402
Satoshi API - Bitcoin Fee Intelligence (Current Fees) is a paid API for AI agents from bitcoinsapi.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).
Returns live Bitcoin fee recommendations, mempool pressure, and cost estimates to help apps and agents decide whether to send now or wait
Price / call$0.001
Success—
StatusUnknown
How this service works
Know when to send Bitcoin and when to wait. Satoshi API gives apps and AI agents live fee recommendations, mempool context, and cost estimates. Free, open source.
Output
A JSON object containing: a 'recommendation' field with a send-or-wait verdict, 'mempool_pressure' level (e.g. low/medium/high), 'fastest_fee_sat_vb' for next-block confirmation, 'half_hour_fee_sat_vb', 'hour_fee_sat_vb', 'economy_fee_sat_vb' for slow/cheap confirmation, a human-readable 'summary' string, and a 'source' field indicating data origin.
Example use cases
Timing a Bitcoin withdrawal from an exchange
“I need to withdraw Bitcoin from my exchange to cold storage — check the current mempool pressure and fee rates and tell me if now is a good time to send, or if I should wait for cheaper fees.”
Automated Bitcoin payment bot fee gating
“Before my app sends this Bitcoin transaction, check the current fee recommendation — if the mempool pressure is high or the fastest fee is above 20 sat/vB, hold the payment and wait.”
Briefing a user on Bitcoin fee conditions
“What's the Bitcoin fee situation right now? Give me the send-or-wait verdict, current mempool pressure, and the fee rates I should expect for fast versus economy confirmation.”
Technical details
Endpoint
POSThttps://bitcoinsapi.com/api/v1/fees/now?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an app or AI agent needs a real-time, opinionated send-or-wait verdict for Bitcoin transactions, especially when automating payment flows that should pause during high-fee periods. It is ideal over raw mempool data sources when you need a pre-digested recommendation rather than raw block data, and when cost is a concern ($0.001 USDC per call).
Side effects
- Payment required (402) if x402 micropayment header is missing or invalid
- Stale or unavailable mempool data if Bitcoin node connection is disrupted
- Unexpected schema response if upstream fee estimation source changes
- Rate limiting or timeout if mempool is queried during high network load
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"schema": {
"type": "object",
"required": [
"recommendation",
"mempool_pressure",
"fastest_fee_sat_vb",
"summary"
],
"properties": {
"source": {
"type": "string"
},
"summary": {
"type": "string"
},
"recommendation": {
"type": "string",
"description": "Send-or-wait verdict for the current Bitcoin fee market."
},
"hour_fee_sat_vb": {
"type": "number"
},
"mempool_pressure": {
"type": "string"
},
"economy_fee_sat_vb": {
"type": "number"
},
"fastest_fee_sat_vb": {
"type": "number"
},
"half_hour_fee_sat_vb": {
"type": "number"
}
}
},
"example": {
"source": "bitcoin-core-estimates",
"summary": "Bitcoin fees look usable now at 12 sat/vB; use about 5 sat/vB if you can wait an hour.",
"recommendation": "send",
"hour_fee_sat_vb": 5,
"mempool_pressure": "medium",
"economy_fee_sat_vb": 3,
"fastest_fee_sat_vb": 12,
"half_hour_fee_sat_vb": 8
},
"mimeType": "application/json"
}Tags
x402
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