curl --request GET \
--url https://api.rivermarkets.com/v1/tradeprints \
--header 'X-River-Key-Id: <api-key>' \
--header 'X-River-Org-Id: <api-key>' \
--header 'X-River-Signature: <api-key>' \
--header 'X-River-Timestamp: <api-key>'import requests
url = "https://api.rivermarkets.com/v1/tradeprints"
headers = {
"X-River-Key-Id": "<api-key>",
"X-River-Timestamp": "<api-key>",
"X-River-Signature": "<api-key>",
"X-River-Org-Id": "<api-key>"
}
response = requests.get(url, headers=headers)
print(response.text)const options = {
method: 'GET',
headers: {
'X-River-Key-Id': '<api-key>',
'X-River-Timestamp': '<api-key>',
'X-River-Signature': '<api-key>',
'X-River-Org-Id': '<api-key>'
}
};
fetch('https://api.rivermarkets.com/v1/tradeprints', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.rivermarkets.com/v1/tradeprints",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => [
"X-River-Key-Id: <api-key>",
"X-River-Org-Id: <api-key>",
"X-River-Signature: <api-key>",
"X-River-Timestamp: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://api.rivermarkets.com/v1/tradeprints"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("X-River-Key-Id", "<api-key>")
req.Header.Add("X-River-Timestamp", "<api-key>")
req.Header.Add("X-River-Signature", "<api-key>")
req.Header.Add("X-River-Org-Id", "<api-key>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.get("https://api.rivermarkets.com/v1/tradeprints")
.header("X-River-Key-Id", "<api-key>")
.header("X-River-Timestamp", "<api-key>")
.header("X-River-Signature", "<api-key>")
.header("X-River-Org-Id", "<api-key>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.rivermarkets.com/v1/tradeprints")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Get.new(url)
request["X-River-Key-Id"] = '<api-key>'
request["X-River-Timestamp"] = '<api-key>'
request["X-River-Signature"] = '<api-key>'
request["X-River-Org-Id"] = '<api-key>'
response = http.request(request)
puts response.read_body{
"results": [
{
"status": "ok",
"river_id": 123,
"trades": [
{
"price": 123,
"qty": 123,
"exchange_timestamp": "<string>",
"aggressor_buy_flag": true,
"exchange_trade_id": "<string>"
}
],
"message": "<string>"
}
]
}{
"detail": [
{
"loc": [
"<string>"
],
"msg": "<string>",
"type": "<string>",
"input": "<unknown>",
"ctx": {}
}
]
}Get Tradeprints
Return the most recent trades for one or more markets. Markets whose trade
history River has fully captured are served from River’s own data; the rest
are fetched from the exchange (concurrently, under a small semaphore so a long
input list never fans out into a thundering herd) while a backfill of their
history is queued. The result list preserves the input order. A failure on
any single market becomes a not_found row with a message — the call as a
whole does not 500.
Exchange lookup paths:
- Kalshi:
GET /markets/trades?ticker=...&limit=... - Polymarket:
GET https://data-api.polymarket.com/trades?market=<condition_id>&limit=...(the NO leg is flipped into YES-price terms) - Polymarket US: always River’s own capture (no public API)
Trades are sorted newest-first within each market. Prices are normalised to 0-1.
Use this together with the /v1/ws/tradeprints WebSocket: hit this endpoint to
backfill the tape on page load, then dedup live WS events by exchange_trade_id.
curl --request GET \
--url https://api.rivermarkets.com/v1/tradeprints \
--header 'X-River-Key-Id: <api-key>' \
--header 'X-River-Org-Id: <api-key>' \
--header 'X-River-Signature: <api-key>' \
--header 'X-River-Timestamp: <api-key>'import requests
url = "https://api.rivermarkets.com/v1/tradeprints"
headers = {
"X-River-Key-Id": "<api-key>",
"X-River-Timestamp": "<api-key>",
"X-River-Signature": "<api-key>",
"X-River-Org-Id": "<api-key>"
}
response = requests.get(url, headers=headers)
print(response.text)const options = {
method: 'GET',
headers: {
'X-River-Key-Id': '<api-key>',
'X-River-Timestamp': '<api-key>',
'X-River-Signature': '<api-key>',
'X-River-Org-Id': '<api-key>'
}
};
fetch('https://api.rivermarkets.com/v1/tradeprints', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.rivermarkets.com/v1/tradeprints",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => [
"X-River-Key-Id: <api-key>",
"X-River-Org-Id: <api-key>",
"X-River-Signature: <api-key>",
"X-River-Timestamp: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://api.rivermarkets.com/v1/tradeprints"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("X-River-Key-Id", "<api-key>")
req.Header.Add("X-River-Timestamp", "<api-key>")
req.Header.Add("X-River-Signature", "<api-key>")
req.Header.Add("X-River-Org-Id", "<api-key>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.get("https://api.rivermarkets.com/v1/tradeprints")
.header("X-River-Key-Id", "<api-key>")
.header("X-River-Timestamp", "<api-key>")
.header("X-River-Signature", "<api-key>")
.header("X-River-Org-Id", "<api-key>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.rivermarkets.com/v1/tradeprints")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Get.new(url)
request["X-River-Key-Id"] = '<api-key>'
request["X-River-Timestamp"] = '<api-key>'
request["X-River-Signature"] = '<api-key>'
request["X-River-Org-Id"] = '<api-key>'
response = http.request(request)
puts response.read_body{
"results": [
{
"status": "ok",
"river_id": 123,
"trades": [
{
"price": 123,
"qty": 123,
"exchange_timestamp": "<string>",
"aggressor_buy_flag": true,
"exchange_trade_id": "<string>"
}
],
"message": "<string>"
}
]
}{
"detail": [
{
"loc": [
"<string>"
],
"msg": "<string>",
"type": "<string>",
"input": "<unknown>",
"ctx": {}
}
]
}Authorizations
UUID of your API key (from Settings → API Keys).
Current unix milliseconds (unix seconds also accepted). Must be within 30s of server time.
Base64 Ed25519 signature over the canonical request: METHOD\nPATH\nSORTED_QUERY\nTIMESTAMP\nSHA256(body) hex. See /api-reference/authentication for the full recipe.
Your organization id (from GET /v1/rate-limit). Signed requests are rate limited per organization on this header; a missing or wrong value is refused with 403.
Query Parameters
River market IDs (repeat the param for each)
Max trades returned per market
1 <= x <= 200Response
Successful Response
Response for GET /v1/tradeprints?river_ids=....
results preserves the order of the requested river_ids. Partial failures
are surfaced per-row (status not_found) with a message — a bad river_id
or upstream error never aborts the whole call.
Show child attributes
Show child attributes

