About BitcoinsAPI

BitcoinsAPI is an independent software project maintained by Bortlesboat. It provides a free Bitcoin fee calculator, a public fee-data API, and an experimental x402 payment integration.

The project started in March 2026. The current website runs on a Cloudflare Worker. The earlier, broader Python API remains a historical, self-hostable repository; it is not the service running here.

The build log explains the implementation and release history. The source repository preserves the earlier API; publication of the current edge source and a signed release remains pending.

The fee calculator combines a transaction size you enter with validated fee-rate data from mempool.space. Rates are estimates, and a priority tier is not a confirmation-time guarantee. A transaction's actual size and the network's conditions determine its eventual fee and confirmation time.

The developer guide shows how to use the free preview endpoint without an account, API key, or wallet. The optional paid route adds a send-or-wait heuristic to the same source data; its method and limitations are public.

Check status for the payment configuration and evidence for recorded settlements. An enabled route is not evidence of a successful payment or independent adoption.

Send questions, corrections, or reports of broken pages to api@bitcoinsapi.com. See contact details and the privacy policy.