mempool.space
Bitcoin fees, bitcoin address balances and bitcoin transactions
mempool.space provides Bitcoin mempool, transaction fee, block, price, and address activity data, including current fee estimates and up to 50 recent address transactions.
Your information
Bitcoin address starting with 1, 3 or bc1, for example 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa.
Maximum recent transactions to return, for example 10. Defaults to 10; maximum 50.
Example results
Bitcoin address: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa
Activity summary
- Lifetime received (BTC)
- 57.48
- Lifetime sent (BTC)
- 0
- All-time transactions
- 66,619
Recent transactions
About the mempool.space tool
mempool.space, also called Mempool, returns Bitcoin fee recommendations, estimated costs, and the Bitcoin price; it needs no input.
Get bitcoin address returns address balances and recent transactions; it needs a Bitcoin address and optionally a transaction count.
Built from mempool.space. Last checked Sep 29, 2026.
Actions
Get bitcoin address
1 creditSee a Bitcoin address’s confirmed and pending balances, lifetime received and sent amounts, and up to 50 recent transactions. USD balance uses the latest reported Bitcoin price; received and sent totals include pending transactions.
What you provide
| Field | Type | Required | Description |
|---|---|---|---|
Addressaddress | Text | Required | Bitcoin address starting with 1, 3 or bc1, for example 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa.Example: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa |
Max Transactionsmax_transactions | Number | Optional | Maximum recent transactions to return, for example 10. Defaults to 10; maximum 50.Example: 10 |
What you get
| Field | Type | Description |
|---|---|---|
Addressaddress | Text | Example: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa |
Total Sent Btctotal_sent_btc | Number | Example: 0 |
Transaction Counttransaction_count | Number | Example: 66619 |
Total Received Btctotal_received_btc | Number | Example: 57.47644956 |
Recent Transactionsrecent_transactions | List | |
Linkrecent_transactions[].link | Text | Transaction page on mempool.space.Example: https://mempool.space/tx/c99e446ab2d43e999de5708e62a8384f187f8015cc6d188af2a23e… |
Fee Btcrecent_transactions[].fee_btc | Number | Whole transaction network fee in BTC, not necessarily paid by this address.Example: 2e-7 |
Confirmedrecent_transactions[].confirmed | Text | Whether this transaction is confirmed.Example: no |
Date Timerecent_transactions[].date_time | Date | Confirmation date and time in UTC, or null when unconfirmed.Example: 2026-09-06T09:33:10+00:00 |
Block Heightrecent_transactions[].block_height | Number | Block height, or null when unconfirmed.Example: 965743 |
Net Change Btcrecent_transactions[].net_change_btc | Number | Change in this address’s balance in BTC, negative for a net send.Example: 0.00003672 |
Transaction IDrecent_transactions[].transaction_id | Text | Transaction ID.Example: c99e446ab2d43e999de5708e62a8384f187f8015cc6d188af2a23e8d313b39a4 |
Confirmed Balance Btcconfirmed_balance_btc | Number | Example: 57.47633581 |
Confirmed Balance (USD)confirmed_balance_usd | Number | Example: 4779042.37 |
Unconfirmed Balance Btcunconfirmed_balance_btc | Number | Example: 0.00011375 |
Example result
For Address: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa, Max Transactions: 10
{
"address": "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa",
"total_sent_btc": 0,
"transaction_count": 66619,
"total_received_btc": 57.47644956,
"recent_transactions": [
{
"link": "https://mempool.space/tx/c99e446ab2d43e999de5708e62a8384f187f8015cc6d188af2a23e8d313b39a4",
"fee_btc": 2e-7,
"confirmed": "no",
"date_time": null,
"block_height": null,
"net_change_btc": 0.00003672,
"transaction_id": "c99e446ab2d43e999de5708e62a8384f187f8015cc6d188af2a23e8d313b39a4"
},
{
"link": "https://mempool.space/tx/4fe8b2b6fec09c158e1bd622e236a629510c87d4f77a9778f416a850aab041db",
"fee_btc": 4.3e-7,
"confirmed": "no",
"date_time": null,
"block_height": null,
"net_change_btc": 0.00000546,
"transaction_id": "4fe8b2b6fec09c158e1bd622e236a629510c87d4f77a9778f416a850aab041db"
},
{
"link": "https://mempool.space/tx/5b38b8e6c131189d1366d8b73241a6034ccd637edd4d5ad1c7195dfb92d9e847",
"fee_btc": 5.5e-7,
"confirmed": "no",
"date_time": null,
"block_height": null,
"net_change_btc": 0.00000546,
"transaction_id": "5b38b8e6c131189d1366d8b73241a6034ccd637edd4d5ad1c7195dfb92d9e847"
}
],
"confirmed_balance_btc": 57.47633581,
"confirmed_balance_usd": 4779042.37,
"unconfirmed_balance_btc": 0.00011375
}Get bitcoin fees
1 creditGet current Bitcoin fee-rate recommendations, estimated USD costs for a 140-vbyte transaction, and the Bitcoin price in USD. Confirmation times are estimates, not guarantees.
What you provide
No inputs needed.
What you get
| Field | Type | Description |
|---|---|---|
Reading Timereading_time | Date | Time these readings were fetched, in UTC.Example: 2026-09-29T04:48:00Z |
Currency Codecurrency_code | Text | Currency of estimated costs and Bitcoin price (USD).Example: USD |
Economy Cost (USD)economy_cost_usd | Number | Estimated USD fee for a 140-vbyte transaction at the economy rate.Example: 0.1164184 |
Minimum Cost (USD)minimum_cost_usd | Number | Estimated USD fee for a 140-vbyte transaction at the minimum rate.Example: 0.1164184 |
Bitcoin Price (USD)bitcoin_price_usd | Number | Price of one bitcoin in US dollars.Example: 83156 |
One Hour Cost (USD)one_hour_cost_usd | Number | Estimated USD fee for a 140-vbyte transaction at the about 1 hour rate.Example: 0.1164184 |
Next Block Cost (USD)next_block_cost_usd | Number | Estimated USD fee for a 140-vbyte transaction at the next block (fastest) rate.Example: 0.4656736 |
Thirty Minutes Cost (USD)thirty_minutes_cost_usd | Number | Estimated USD fee for a 140-vbyte transaction at the about 30 minutes rate.Example: 0.4656736 |
Economy Fee Sat Per Vbyteeconomy_fee_sat_per_vbyte | Number | Economy recommended transaction fee rate in satoshis per virtual byte.Example: 1 |
Minimum Fee Sat Per Vbyteminimum_fee_sat_per_vbyte | Number | Minimum recommended transaction fee rate in satoshis per virtual byte.Example: 1 |
One Hour Fee Sat Per Vbyteone_hour_fee_sat_per_vbyte | Number | About 1 hour recommended transaction fee rate in satoshis per virtual byte.Example: 1 |
Next Block Fee Sat Per Vbytenext_block_fee_sat_per_vbyte | Number | Next block (fastest) recommended transaction fee rate in satoshis per virtual byte.Example: 4 |
Thirty Minutes Fee Sat Per Vbytethirty_minutes_fee_sat_per_vbyte | Number | About 30 minutes recommended transaction fee rate in satoshis per virtual byte.Example: 4 |
Example result
For
{
"reading_time": "2026-09-29T04:48:00Z",
"currency_code": "USD",
"economy_cost_usd": 0.1164184,
"minimum_cost_usd": 0.1164184,
"bitcoin_price_usd": 83156,
"one_hour_cost_usd": 0.1164184,
"next_block_cost_usd": 0.4656736,
"thirty_minutes_cost_usd": 0.4656736,
"economy_fee_sat_per_vbyte": 1,
"minimum_fee_sat_per_vbyte": 1,
"one_hour_fee_sat_per_vbyte": 1,
"next_block_fee_sat_per_vbyte": 4,
"thirty_minutes_fee_sat_per_vbyte": 4
}For developers
Call it from your code with one request. Change the values in input to run it on new data. To get an API key, open Developers at the bottom of Studio, turn on Developer mode and go to API keys.
curl 'https://api.fous.com/v1/query' \
--fail-with-body --silent --show-error --max-time 180 \
-H "Authorization: Bearer YOUR_API_KEY" \
-H 'Content-Type: application/json' \
--data-raw '{
"api": "@mempool-space",
"visibility": "public",
"operation": "get_bitcoin_address",
"version": 1,
"input": {
"address": "1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa",
"max_transactions": 10
},
"response": {
"format": "json"
}
}'What you can do with it
- Compare estimated Bitcoin transaction costs across confirmation speeds.
- Track confirmed and pending balances for a Bitcoin address.
- Review recent transactions and balance changes for an address.
- Monitor lifetime Bitcoin received and sent by an address.
Questions about mempool.space
Can I run it with my own inputs?
Yes. Change the inputs in Studio and press Run, or send new inputs from your code, or ask a connected AI assistant.
Can I call this mempool.space tool as an API?
Yes. Send a POST request to /v1/query with your Fous API key and the inputs, and get JSON back.
How much does it cost?
Each completed run costs 1 credit. Failed runs without a completed receipt are free; completed work can remain charged if delivery is interrupted. With pay as you go, a credit costs 1¢. Monthly plans cost less per credit.
Do I need a mempool.space account?
No. You only need a Fous account.
How current is the data?
Fous gets the data from mempool.space when you run it. Some results are reused for up to 24 hours, and results that use your account or key are never reused. It was last verified on Sep 29, 2026.
What are the recommended Bitcoin fee rates?
Get bitcoin fees returns recommended fee rates for economy, minimum, about one hour, about 30 minutes, and the next block.
What is the balance of a Bitcoin address?
Get bitcoin address returns confirmed and unconfirmed balances, including the confirmed balance in USD.
Which transactions were recently made by an address?
Get bitcoin address returns up to 50 recent transactions, including confirmation status and the address’s net balance change.