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Bitcoin Fee Market Analytics API
x402
Bitcoin Fee Market Analytics API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status down (last checked 2026-09-14).
Returns current Bitcoin mempool fee-tier estimates for 1/3/6/12/24/144-block confirmations plus historical fee percentiles, SegWit adoption, UTXO delta, and fee elasticity metric
Price / call$0.02
Success—
StatusDown
How this service works
Professional crypto market intelligence. Real-time prices, signals, and market scoring.
Output
A JSON object containing: current mempool fee estimates in sat/vB for 1, 3, 6, 12, 24, and 144-block confirmation targets; historical fee percentiles (10th, 25th, 50th, 75th, 90th) over the last N blocks; a fee elasticity metric (next-block / 144-block ratio) indicating current price sensitivity; current SegWit adoption percentage; and UTXO set delta. All data is node-backed and labeled as informational research.
Example use cases
Optimize wallet sweep transaction costs
“Check the current Bitcoin fees for a 12-block confirmation target and show me the historical 25th percentile over the last hundred blocks so I can batch my wallet sweep efficiently without overpaying.”
Monitor mempool congestion trends
“What's the fee elasticity looking like right now, and how does today's 50th percentile compare to the 90th percentile over the past few blocks? I want to know if the mempool is getting more competitive.”
SegWit adoption and fee market health
“Pull the current SegWit adoption percentage along with the 6-block and 24-block fee estimates — I need to assess network efficiency and decide whether to recommend SegWit to my users based on actual fee savings.”
Technical details
Endpoint
GEThttps://api.carbon-cashmere.de/v1/bitcoin/fee-marketWhen to prefer
Choose this endpoint when you need a comprehensive, node-backed snapshot of the Bitcoin fee market combining real-time mempool fee tiers with historical percentile context and fee elasticity, SegWit adoption, and UTXO delta — all in one call. Prefer this over generic blockchain explorers when you need structured analytics for fee estimation decisions, mempool research, or trend monitoring.
Side effects
- Node connectivity issue — Bitcoin node unreachable, returns 503 or timeout
- Invalid query parameters — returns 400 with validation error
- Payment not processed — x402 payment required before data is returned
- Rate limit exceeded — too many requests in short window, returns 429
- Historical N blocks parameter out of range — returns 400 if N exceeds max allowed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"_meta": {
"disclaimer": "Informational research data only — not investment advice."
},
"mempool": {
"size_mb": 1.86,
"pressure": "low",
"tx_count": 5976,
"fee_trend": "stable"
},
"fee_elasticity": 2,
"blocks_analyzed": 144,
"fee_current_satvb": {
"3_block_satvb": 1,
"6_block_satvb": 1,
"144_block_satvb": 1,
"next_block_satvb": 2
},
"fee_historical_over_blocks": {
"segwit_pct_median": 0.91,
"feerate_median_p50": 3.2,
"feerate_median_p90": 12.4
}
}
}Tags
x402
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