diff --git a/DESCRIPTION b/DESCRIPTION
index 8e88b5c..6775aec 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -27,7 +27,9 @@ Imports:
   future.apply,
   qs,
   RCurl,
-  RJSONIO
+  RJSONIO,
+  RSQLite,
+  DBI
 Suggests:
   archive,
   testthat (>= 3.0.0),
diff --git a/NAMESPACE b/NAMESPACE
index 59cf300..b82ebf4 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -3,5 +3,8 @@ export("ping.peers")
 export("get.p2p.log")
 export("compress.log")
 export("newborn.nodes")
-importFrom("utils", "read.csv", "untar", "installed.packages")
+export("txpool.init")
+export("txpool.collect")
+export("txpool.export")
+importFrom("utils", "read.csv", "write.csv", "untar", "installed.packages")
 importFrom("stats", "complete.cases", "quantile")
diff --git a/R/newborn.R b/R/newborn.R
index 8bf2f31..cf7910c 100644
--- a/R/newborn.R
+++ b/R/newborn.R
@@ -11,7 +11,7 @@
 #' recorded so far. Each peer will only be printed once during a specific run of
 #' `newborn.nodes`, even if the node disconnects and reconnects later.
 #'
-#' @param unrestricted.rpc.url URL and port of the monerod unrestricted RPC.
+#' @param unrestricted.rpc.url URL and port of the `monerod` unrestricted RPC.
 #' Default is `http://127.0.0.1:18081`
 #' @param poll.time How often, in seconds, to check for a newborn node
 #' connection. Default is 30 seconds.
diff --git a/R/txpool.R b/R/txpool.R
new file mode 100644
index 0000000..ddafaf4
--- /dev/null
+++ b/R/txpool.R
@@ -0,0 +1,331 @@
+
+
+
+
+
+#' Initialize txpool archive database
+#'
+#' @description Initializes a database file to record the arrival time of
+#' transactions to the local Monero node.
+#'
+#' @param db.file Name and path of database file to be created.
+#'
+#' @return
+#' NULL (invisible)
+#' @seealso [txpool.collect], which collects txpool data and saves it to the
+#' database file and [txpool.export], which exports the database contents to a
+#' CSV file.
+#' @export
+#'
+#' @examples
+#' \dontrun{
+#' txpool.init()
+#' }
+
+txpool.init <- function(db.file = "xmr-txpool-archive.db") {
+
+  if (file.exists(db.file)) {
+    stop(paste0("File already exists at ", db.file, "\n Aborting new database file creation."))
+  }
+
+  con <- DBI::dbConnect(RSQLite::SQLite(), db.file)
+  DBI::dbExecute(con, "PRAGMA journal_mode=WAL;")
+  # txpool.export() can read while txpool.collect() writes
+  # https://stackoverflow.com/questions/15143871/simplest-way-to-retry-sqlite-query-if-db-is-locked
+
+  DBI::dbExecute(con,
+"CREATE TABLE txs (
+id_hash TEXT,
+fee TEXT,
+weight TEXT,
+receive_time TEXT,
+unique(id_hash)
+)")
+  # unique(id_hash) prevents the same txs being inserted more than once
+
+  DBI::dbExecute(con,
+"CREATE TABLE blocks (
+block_hash TEXT,
+prev_block_hash TEXT,
+block_height TEXT,
+block_timestamp TEXT,
+block_receive_time TEXT,
+unique(block_hash)
+)")
+
+  if (file.exists(paste0(getwd(), "/", db.file))) {
+    db.filepath <- paste0(getwd(), "/", db.file)
+  }
+
+  if (file.exists(db.file)) {
+    # This would happen if the user gave a full filepath
+    db.filepath <- db.file
+  }
+
+  if (! exists("db.filepath")) {
+    stop("Database file failed to be created or it cannot be found in the file system.")
+  }
+
+  message(paste0("Database file successfully created at ", db.filepath))
+
+  return(invisible(NULL))
+
+}
+
+
+
+#' Collect txpool archive data
+#'
+#' @description Queries the local Monero node for its txpool once per second.
+#' The time of arrival of each transaction is saved to a database file. The
+#' database file must first be created by [txpool.init]. This function executes
+#' an infinite loop. Input `ctrl + c` to interrupt the function.
+#'
+#' @param db.file Name and path of database file created by [txpool.init].
+#' @param unrestricted.rpc.url URL and port of the `monerod` unrestricted RPC.
+#' Default is `http://127.0.0.1:18081`
+#'
+#' @return
+#' NULL (invisible)
+#' @seealso [txpool.init], which create the database file and [txpool.export],
+#' which exports the database contents to a CSV file.
+#' @export
+#'
+#' @examples
+#' \dontrun{
+#' txpool.collect()
+#' }
+
+txpool.collect <- function(db.file = "xmr-txpool-archive.db",
+  unrestricted.rpc.url = "http://127.0.0.1:18081") {
+
+  if (! file.exists(db.file)) {
+    stop(paste0("Database file ", db.file, " does not exist. Please run txpool.init() first."))
+  }
+
+  # Modified from TownforgeR::tf_rpc_curl function
+  xmr.rpc <- function(
+    url.rpc = "http://127.0.0.1:18081/json_rpc",
+    method = "",
+    params = list(),
+    userpwd = "",
+    num.as.string = TRUE,
+    nonce.as.string = FALSE,
+    keep.trying.rpc = FALSE,
+    ...
+  ){
+
+    json.ret <- RJSONIO::toJSON(
+      list(
+        jsonrpc = "2.0",
+        id = "0",
+        method = method,
+        params = params
+      ), digits = 50
+    )
+
+    rcp.ret <- 	tryCatch(RCurl::postForm(url.rpc,
+      .opts = list(
+        userpwd = userpwd,
+        postfields = json.ret,
+        httpheader = c('Content-Type' = 'application/json', Accept = 'application/json')
+        # https://stackoverflow.com/questions/19267261/timeout-while-reading-csv-file-from-url-in-r
+      )
+    ), error = function(e) {NULL})
+
+    if (keep.trying.rpc && length(rcp.ret) == 0) {
+      while (length(rcp.ret) == 0) {
+        rcp.ret <- 	tryCatch(RCurl::postForm(url.rpc,
+          .opts = list(
+            userpwd = userpwd,
+            postfields = json.ret,
+            httpheader = c('Content-Type' = 'application/json', Accept = 'application/json')
+            # https://stackoverflow.com/questions/19267261/timeout-while-reading-csv-file-from-url-in-r
+          )
+        ), error = function(e) {NULL})
+      }
+    }
+
+    if (is.null(rcp.ret)) {
+      stop("Cannot connect to monerod. Is monerod running?")
+    }
+
+    if (num.as.string) {
+      rcp.ret <- gsub("(: )([-0123456789.]+)([,\n\r])", "\\1\"\\2\"\\3", rcp.ret )
+    }
+
+    if (nonce.as.string & ! num.as.string) {
+      rcp.ret <- gsub("(\"nonce\": )([-0123456789.]+)([,\n\r])", "\\1\"\\2\"\\3", rcp.ret )
+    }
+
+    RJSONIO::fromJSON(rcp.ret) # , simplify = FALSE
+  }
+
+  tx.pool <- c()
+
+  message("Checking that Monero node has acceptable configuration Please wait for confirmation...")
+
+  # Check that node is responding
+  while(length(tx.pool) == 0) {
+    tx.pool <- xmr.rpc(paste0(unrestricted.rpc.url, "/get_transaction_pool"), num.as.string = FALSE)$transactions
+
+    if (length(tx.pool) > 0 && tx.pool[[1]]$receive_time == 0) {
+      stop("Transaction receive_time is missing. Possible solution: remove '--restricted-rpc' monerod flag.")
+    }
+    Sys.sleep(1)
+  }
+
+  message("Monero node seems to have acceptable configuration. Initiating data collection!")
+
+  con <- DBI::dbConnect(RSQLite::SQLite(), db.file)
+  DBI::dbExecute(con, "PRAGMA journal_mode=WAL;")
+  # txpool.export() can read while txpool.collect() writes
+  # https://stackoverflow.com/questions/15143871/simplest-way-to-retry-sqlite-query-if-db-is-locked
+
+  on.exit(message(paste0("txpool data collection stopped at ", base::date())))
+
+  while (TRUE) {
+
+    compute.time <- system.time({
+
+      tx.pool <- xmr.rpc(paste0(unrestricted.rpc.url, "/get_transaction_pool"), num.as.string = FALSE, keep.trying.rpc = TRUE)$transactions
+
+      block.header <- xmr.rpc(paste0(unrestricted.rpc.url, "/json_rpc"), method = "get_last_block_header", num.as.string = FALSE)$result$block_header
+
+      block_receive_time <- round(Sys.time())
+      # One-second time resolution
+
+      if (length(tx.pool) > 0) {
+
+        txs <- vector(mode = "list", length = length(tx.pool))
+
+        for (i in seq_along(tx.pool)) {
+          txs[[i]] <- data.table::data.table(
+            id_hash = tx.pool[[i]]$id_hash,
+            fee = tx.pool[[i]]$fee,
+            weight = tx.pool[[i]]$weight,
+            receive_time = tx.pool[[i]]$receive_time)
+        }
+
+        txs <- data.table::rbindlist(txs)
+
+        tx.statement <- DBI::dbSendQuery(con,
+          "INSERT OR IGNORE INTO txs VALUES (:id_hash,:fee,:weight,:receive_time)")
+        # "IGNORE" prevents the same txs from being inserted more than once
+        DBI::dbBind(tx.statement, params = txs)
+        DBI::dbClearResult(tx.statement)
+
+        blocks <- data.table::data.table(
+          block_hash = block.header$hash,
+          prev_block_hash = block.header$prev_hash,
+          block_height = block.header$height,
+          block_timestamp = block.header$timestamp,
+          block_receive_time = as.character(as.numeric(block_receive_time))
+        )
+
+        block.statement <- DBI::dbSendQuery(con,
+          "INSERT OR IGNORE INTO blocks VALUES (:block_hash,:prev_block_hash,:block_height,:block_timestamp,:block_receive_time)")
+        # "IGNORE" prevents the same blocks from being inserted more than once
+        DBI::dbBind(block.statement, params = blocks)
+        DBI::dbClearResult(block.statement)
+
+      }
+    })
+
+    loop.message <- paste0(format(Sys.time(), "%Y-%m-%d %T"), " ",
+      formatC(nrow(txs), width = 4), " txs in txpool. Took ",
+      sprintf("%.3f", round(compute.time["elapsed"], 3)),
+      " seconds to execute txpool query.\n")
+    cat(loop.message)
+    Sys.sleep(max(c(0, 1 - compute.time["elapsed"])))
+    # Should poll once per second unless data processing takes more than one second. In
+    # that case, polls as frequently as possible.
+  }
+
+  return(invisible(NULL))
+
+}
+
+
+
+
+#' Export txpool archive to CSV
+#'
+#' @description Exports transaction and block arrival times from a database file
+#' to a CSV file. Must use [txpool.init] and [txpool.collect] first.
+#' [txpool.export] can be used while [txpool.collect] is still running in a
+#' separate R session.
+#'
+#'
+#' @param db.file File name/path of the txpool archive database.
+#' @param csv.filepath File path of CSV file that will be created. Leave
+#' default to save in current working directory.
+#' @param begin.date Optional argument to restrict data export date range.
+#' Use "YYYY-MM-DD" format.
+#' @param end.date Optional argument to restrict data export date range.
+#' Use "YYYY-MM-DD" format.
+#'
+#' @return
+#' NULL (invisible)
+#' @seealso [txpool.init], which create the database file and [txpool.collect],
+#' which collects txpool data and saves it to the database file.
+#' @export
+#'
+#' @examples
+#' \dontrun{
+#' txpool.export()
+#' }
+
+txpool.export <- function(db.file = "xmr-txpool-archive.db", csv.filepath = "",
+  begin.date = "1970-01-01", end.date = "2035-01-01") {
+
+  if (! file.exists(db.file)) {
+    stop(paste0("Database file ", db.file, " does not exist."))
+  }
+
+  begin.date.filename <- ifelse(begin.date == "1970-01-01", "", paste0("begin-", begin.date, "-"))
+  end.date.filename <- ifelse(end.date == "2035-01-01", "", paste0("end-" , end.date, "-"))
+
+  con <- DBI::dbConnect(RSQLite::SQLite(), db.file)
+  DBI::dbExecute(con, "PRAGMA journal_mode=WAL;")
+  # txpool.export() can read while txpool.collect() writes
+  # https://stackoverflow.com/questions/15143871/simplest-way-to-retry-sqlite-query-if-db-is-locked
+
+  file.time <- round(Sys.time())
+
+  txs <- DBI::dbGetQuery(con, paste0(
+    "SELECT * FROM txs WHERE receive_time >= ", as.integer(as.POSIXct(begin.date)),
+    " AND receive_time <= ", as.integer(as.POSIXct(end.date)) + 24L * 60L * 60L
+    # 24L * 60L * 60L to get the end of the day
+  ))
+
+  txs$receive_time_UTC <- as.POSIXct(as.integer(txs$receive_time), origin = "1970-01-01")
+
+  txpool.filename <- paste0(csv.filepath, "xmr-txpool-archive-", begin.date.filename,
+    end.date.filename, "exporttime-", gsub("( )|([:])", "-", file.time), ".csv")
+
+  write.csv(txs, txpool.filename, row.names = FALSE)
+
+  message("Successfully wrote txpool CSV to ", txpool.filename)
+
+  blocks <- DBI::dbGetQuery(con, paste0(
+    "SELECT * FROM blocks WHERE block_receive_time >= ", as.integer(as.POSIXct(begin.date)),
+    " AND block_receive_time <= ", as.integer(as.POSIXct(end.date)) + 24L * 60L * 60L
+    # 24L * 60L * 60L to get the end of the day
+  ))
+
+  blocks$block_receive_time_UTC <- as.POSIXct(as.integer(blocks$block_receive_time), origin = "1970-01-01")
+
+  blocks.filename <- paste0(csv.filepath, "xmr-block-archive-", begin.date.filename,
+    end.date.filename, "exporttime-", gsub("( )|([:])", "-", file.time), ".csv")
+
+  write.csv(blocks, blocks.filename, row.names = FALSE)
+
+  message("Successfully wrote block CSV to ", blocks.filename)
+
+  return(invisible(NULL))
+
+}
+
+
+
diff --git a/man/newborn.nodes.Rd b/man/newborn.nodes.Rd
index 8c31abe..0cf22ea 100644
--- a/man/newborn.nodes.Rd
+++ b/man/newborn.nodes.Rd
@@ -13,7 +13,7 @@ newborn.nodes(
 )
 }
 \arguments{
-\item{unrestricted.rpc.url}{URL and port of the monerod unrestricted RPC.
+\item{unrestricted.rpc.url}{URL and port of the \code{monerod} unrestricted RPC.
 Default is \verb{http://127.0.0.1:18081}}
 
 \item{poll.time}{How often, in seconds, to check for a newborn node
diff --git a/man/txpool.collect.Rd b/man/txpool.collect.Rd
new file mode 100644
index 0000000..60b51b3
--- /dev/null
+++ b/man/txpool.collect.Rd
@@ -0,0 +1,35 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/txpool.R
+\name{txpool.collect}
+\alias{txpool.collect}
+\title{Collect txpool archive data}
+\usage{
+txpool.collect(
+  db.file = "xmr-txpool-archive.db",
+  unrestricted.rpc.url = "http://127.0.0.1:18081"
+)
+}
+\arguments{
+\item{db.file}{Name and path of database file created by \link{txpool.init}.}
+
+\item{unrestricted.rpc.url}{URL and port of the \code{monerod} unrestricted RPC.
+Default is \verb{http://127.0.0.1:18081}}
+}
+\value{
+NULL (invisible)
+}
+\description{
+Queries the local Monero node for its txpool once per second.
+The time of arrival of each transaction is saved to a database file. The
+database file must first be created by \link{txpool.init}. This function executes
+an infinite loop. Input \code{ctrl + c} to interrupt the function.
+}
+\examples{
+\dontrun{
+txpool.collect()
+}
+}
+\seealso{
+\link{txpool.init}, which create the database file and \link{txpool.export},
+which exports the database contents to a CSV file.
+}
diff --git a/man/txpool.export.Rd b/man/txpool.export.Rd
new file mode 100644
index 0000000..ed0656e
--- /dev/null
+++ b/man/txpool.export.Rd
@@ -0,0 +1,43 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/txpool.R
+\name{txpool.export}
+\alias{txpool.export}
+\title{Export txpool archive to CSV}
+\usage{
+txpool.export(
+  db.file = "xmr-txpool-archive.db",
+  csv.filepath = "",
+  begin.date = "1970-01-01",
+  end.date = "2035-01-01"
+)
+}
+\arguments{
+\item{db.file}{File name/path of the txpool archive database.}
+
+\item{csv.filepath}{File path of CSV file that will be created. Leave
+default to save in current working directory.}
+
+\item{begin.date}{Optional argument to restrict data export date range.
+Use "YYYY-MM-DD" format.}
+
+\item{end.date}{Optional argument to restrict data export date range.
+Use "YYYY-MM-DD" format.}
+}
+\value{
+NULL (invisible)
+}
+\description{
+Exports transaction and block arrival times from a database file
+to a CSV file. Must use \link{txpool.init} and \link{txpool.collect} first.
+\link{txpool.export} can be used while \link{txpool.collect} is still running in a
+separate R session.
+}
+\examples{
+\dontrun{
+txpool.export()
+}
+}
+\seealso{
+\link{txpool.init}, which create the database file and \link{txpool.collect},
+which collects txpool data and saves it to the database file.
+}
diff --git a/man/txpool.init.Rd b/man/txpool.init.Rd
new file mode 100644
index 0000000..bd1537b
--- /dev/null
+++ b/man/txpool.init.Rd
@@ -0,0 +1,28 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/txpool.R
+\name{txpool.init}
+\alias{txpool.init}
+\title{Initialize txpool archive database}
+\usage{
+txpool.init(db.file = "xmr-txpool-archive.db")
+}
+\arguments{
+\item{db.file}{Name and path of database file to be created.}
+}
+\value{
+NULL (invisible)
+}
+\description{
+Initializes a database file to record the arrival time of
+transactions to the local Monero node.
+}
+\examples{
+\dontrun{
+txpool.init()
+}
+}
+\seealso{
+\link{txpool.collect}, which collects txpool data and saves it to the
+database file and \link{txpool.export}, which exports the database contents to a
+CSV file.
+}