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CIEL Mempool Watch API
x402
CIEL Mempool Watch API is a paid API for AI agents from 169.58.38.67.sslip.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-18).
Monitors and retrieves real-time Bitcoin or cryptocurrency mempool data, including pending transactions and fee estimates
Price / call$0.05
Success—
StatusUnknown
How this service works
50+ micro-services for AI agents: data parsing, crypto analytics, security scanning, code tools, and more. Pay per call via x402 (USDC on Base) or RapidAPI subscription.
Output
Returns a JSON object containing current mempool state data, which may include pending transaction counts, fee rate estimates (e.g. sat/vB for different confirmation targets), mempool size, and related network congestion metrics.
Example use cases
Fee optimization before sending crypto
“I want to send some Bitcoin — can you check the mempool right now and tell me what fee rate I should use to get confirmed within the next couple of blocks?”
Detect mempool congestion for timing a transfer
“Is the Bitcoin mempool congested right now? I'm trying to decide whether to send my transaction now or wait for it to calm down.”
Monitor unconfirmed transaction backlog
“Can you pull the latest mempool stats and let me know how many unconfirmed transactions are sitting there and what the average wait time looks like?”
Technical details
Endpoint
GEThttps://169.58.38.67.sslip.io/api/mempool-watchWhen to prefer
Choose this endpoint when you need real-time mempool visibility for fee estimation, transaction timing decisions, or network congestion monitoring without running your own node. Well-suited for agents executing crypto payments via x402/USDC on Base and needing to optimize transaction fees on the fly. Pay-per-call at $0.05 USDC makes it cost-effective for infrequent checks versus a subscription.
Side effects
- Upstream blockchain node unavailable — returns error or empty result
- Invalid or unrecognized property filter parameter — may return generic data or 400 error
- Rate limiting exceeded — returns 429 or payment-required response
- Mempool data momentarily stale if node sync is delayed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"result": "data"
}
}Tags
x402
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