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Satoshi API - Bitcoin Fee Market Research
x402
Satoshi API - Bitcoin Fee Market Research is a paid API for AI agents from bitcoinsapi.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Answers natural-language questions about the Bitcoin fee market, returning live fee recommendations, mempool context, and cost estimates to help decide when to send transactions.
Price / call$0.05
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
Returns a JSON object with a natural-language 'answer' (e.g. 'Delay non-urgent transactions if you can'), a 'briefing' summarizing the Bitcoin fee market, a 'market' object with structured mempool and fee data, the original 'question' echoed back, 'citations' listing the underlying data endpoints used, and an 'agent_action' object with a recommended next step for the calling agent.
Example use cases
Timing a large Bitcoin withdrawal
“I need to send a large Bitcoin payment — should I do it now or wait for fees to come down? Check the fee market over the next 12 hours and give me a recommendation.”
Automated wallet fee gating
“Before executing this Bitcoin transfer, check whether the current mempool fees are reasonable or if we should hold off — look 3 hours ahead and tell me the best course of action.”
Fee cost estimation for user display
“A user on my app wants to know how much it will cost in fees to send Bitcoin right now and whether fees are expected to be higher or lower in the next 24 hours — can you get that from the fee market API?”
Technical details
Endpoint
POSThttps://bitcoinsapi.com/api/v1/research/bitcoin-fee-marketWhen to prefer
Use this endpoint when an agent or app needs to decide whether to send a Bitcoin transaction based on current and near-future fee conditions. It is preferred over raw mempool APIs because it returns opinionated, agent-ready recommendations in natural language alongside structured data, rather than requiring the caller to interpret raw fee histograms. Best suited for autonomous agents that need to gate or time Bitcoin transactions without human intervention.
Side effects
- Invalid or missing 'question' field returns a validation error
- horizon_hours out of supported range may return empty forecast data
- Mempool data source unavailability may result in stale or partial market context
- Malformed JSON body returns HTTP 400
- Payment not included or insufficient USDC balance returns HTTP 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| question | string | |
| horizon_hours | integer | |
| include_history | boolean |
Output
Schema · Response
{
"type": "json",
"schema": {
"type": "object",
"required": [
"briefing",
"answer",
"citations"
],
"properties": {
"answer": {
"type": "string"
},
"market": {
"type": "object"
},
"briefing": {
"type": "string"
},
"question": {
"type": "string"
},
"citations": {
"type": "array"
},
"agent_action": {
"type": "object"
}
}
},
"example": {
"answer": "Delay non-urgent transactions if you can.",
"briefing": "Bitcoin fee market research",
"citations": [
{
"endpoint": "/api/v1/fees/landscape"
}
],
"x402_price_usd": "$0.05"
},
"mimeType": "application/json"
}Tags
x402
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