txfee.watch

What It Is

txfee.watch is a fee alert tool for Bitcoin users. Its core goal is to notify users by email when the fee market changes, helping them “Know more, Pay less.” It is not a general-purpose development platform, but rather a highly focused on-chain fee monitoring utility: it alerts users when fees are high to avoid sending transactions that may get stuck or cost more than expected, and alerts them when fees are low so they can consolidate UTXOs and save sats.

Core Features and Integrations

The alert types listed on the page include below 10 sats/byte, above 10 sats/byte, below 50 sats/byte, and above 50 sats/byte. The trigger logic is based on mempool.space’s low priority setting and is checked periodically throughout the day. If the mempool state has changed compared with the previous check, the corresponding email alert is triggered. User preferences can be updated at any time.

From a developer-tools perspective, its extensibility mainly comes from email automation rather than a native API. The page explicitly mentions integration with IFTTT e-mail triggers, allowing fee alerts to trigger Slack notifications, to-do list reminders, or even actions such as flashing smart lights. The text does not mention support for programming languages, SDKs, Webhooks, or REST APIs, nor does it indicate any open-source or self-hosting option.

Pricing, Privacy, and Documentation

The captured text does not provide any pricing model, plans, or payment methods, so its business model cannot be determined. On privacy, the service claims it does not require personally identifiable information, and recommends that users access the form via Tor, use a dedicated new email address for alerts, and even suggests Protonmail to improve security and privacy. The documentation is essentially “page-level guidance”: it explains the alert types and trigger basis, but lacks more complete information such as SLA, data latency, retry behavior on failures, unsubscribe process, and background information about the operator.

Pros, Cons, and Best-Fit Users

Its strengths are simplicity and direct usefulness, especially for individual Bitcoin users, UTXO managers, and people who want to build lightweight automated alerts with IFTTT. The downsides are that the thresholds appear relatively fixed, and there is no stated support for custom fee rates, API/SDK, open source, or self-hosting. Service reliability and long-term maintenance also cannot be assessed from the available text.

Access from China

Access from mainland China is unknown. Because the service depends on external services such as email, IFTTT, and mempool.space, the actual experience may be affected by the network environment. Alternatives include checking mempool.space directly, or building a fee monitoring script based on Bitcoin Core/mempool data.