The Bitcoin + x402 workbench
Bitcoin fees &
x402 tools.
Check what a transaction could cost. Put Bitcoin data in your app. Find a practical starting point for agent payments.
Free to explore. No account, API key, or wallet needed.
Start building with x402
Start a service an agent can pay to use, with a template built on the official SDKs.
Guides + references
Find your next step.
Useful references, organized around what you want to do.
-
Understand Bitcoin fees
Virtual size, priority tiers, and the mempool. Know what goes into a transaction fee.
-
Make an x402 request
Buyer and seller guides for HTTP payments, from a 402 challenge to a receipt.
-
See x402 in practice
Search, agent payments, and service discovery. References with sources and a review date.
Inside the x402 lab
The send-or-wait API
Our optional x402 v2 route adds a send-or-wait heuristic to the same public fee data. The method, payment state, and evidence are here to inspect.
PausedPayments are paused. No payment proof is processed. The free fee preview is available without a wallet.
0.001 USDC per request when enabled. The decision is a heuristic, not a forecast. Operator-funded tests stay separate; live evidence covers a rolling 180-day window.
Payment tuple and compatibility record
- Route
GET /api/v1/fees/now- Resource
https://bitcoinsapi.com/api/v1/fees/now- Price
0.001 USDC- Amount atomic
1000- Protocol
x402 v2 · exact- Network
Base mainnet · eip155:8453- Asset
0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913- Recipient
0x8454A49215A78040c69525D57D05fb5d9B21F663- Timeout
60 seconds- MIME
application/json- Facilitator
xpay- Compatibility
2026-09-08T16:05:04.856Z
Source repository · The published repository preserves the earlier API. Edge source publication and a signed release remain pending; see the release record.