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Bitcoin Mempool Recommended Fees
x402
Bitcoin Mempool Recommended Fees is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.003/call, status down (last checked 2026-10-30).
Returns current recommended Bitcoin transaction fee rates (sat/vB) for different confirmation speed targets from the mempool.
Price / call$0.003
Success—
StatusDown
How this service works
216 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
A JSON object with five integer fee rate fields in sat/vB: fastest_fee (next-block confirmation), half_hour_fee (within 30 min), hour_fee (within 1 hour), economy_fee (low priority), and minimum_fee (bare minimum accepted by mempool).
Example use cases
Urgent Bitcoin transaction fee check
“I need to send Bitcoin urgently — what's the fastest fee rate I should use right now to get confirmed in the next block?”
Economy fee for low-priority Bitcoin send
“What's the cheapest fee rate I can use for a Bitcoin transaction if I don't mind waiting a few hours for confirmation?”
Pre-send fee estimation for wallet app
“Before I send this Bitcoin transaction, what are the current mempool fee recommendations for fast, medium, and slow confirmation speeds?”
Technical details
Endpoint
GEThttps://fastx402.tools/mempool-recommended-fees?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time Bitcoin mempool fee recommendations without setting up an account or API key. Ideal for AI agents that need instant, pay-per-call access to fee data before constructing or broadcasting Bitcoin transactions. Prefer this over self-hosted mempool nodes when simplicity and zero-setup are priorities.
Side effects
- Upstream mempool data unavailable — service may return an error if mempool.space data source is unreachable
- Payment failure — request rejected if USDC micropayment via x402 is not provided or insufficient
- Rate limiting — excessive requests may be throttled
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"hour_fee": 8,
"economy_fee": 6,
"fastest_fee": 12,
"minimum_fee": 2,
"half_hour_fee": 10
}
}Tags
x402
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