curl --request POST \
--url https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin \
--header 'Content-Type: application/json' \
--data '
{
"trader": "<string>",
"tradeIndex": 1,
"additionalCollateralUsdc": "<string>",
"leverage": "<string>",
"coinExposure": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"pairIndex": 1,
"pair": "<string>",
"delegate": "<string>",
"openPrice": "<string>",
"slippagePercent": "1"
}
'import requests
url = "https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin"
payload = {
"trader": "<string>",
"tradeIndex": 1,
"additionalCollateralUsdc": "<string>",
"leverage": "<string>",
"coinExposure": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"pairIndex": 1,
"pair": "<string>",
"delegate": "<string>",
"openPrice": "<string>",
"slippagePercent": "1"
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({
trader: '<string>',
tradeIndex: 1,
additionalCollateralUsdc: '<string>',
leverage: '<string>',
coinExposure: '<string>',
minLeverage: '<string>',
maxLeverage: '<string>',
pairIndex: 1,
pair: '<string>',
delegate: '<string>',
openPrice: '<string>',
slippagePercent: '1'
})
};
fetch('https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin', 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://tx-builder-testnet.avantisfi.com/v2/position/increase-coin",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'trader' => '<string>',
'tradeIndex' => 1,
'additionalCollateralUsdc' => '<string>',
'leverage' => '<string>',
'coinExposure' => '<string>',
'minLeverage' => '<string>',
'maxLeverage' => '<string>',
'pairIndex' => 1,
'pair' => '<string>',
'delegate' => '<string>',
'openPrice' => '<string>',
'slippagePercent' => '1'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin"
payload := strings.NewReader("{\n \"trader\": \"<string>\",\n \"tradeIndex\": 1,\n \"additionalCollateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"delegate\": \"<string>\",\n \"openPrice\": \"<string>\",\n \"slippagePercent\": \"1\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin")
.header("Content-Type", "application/json")
.body("{\n \"trader\": \"<string>\",\n \"tradeIndex\": 1,\n \"additionalCollateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"delegate\": \"<string>\",\n \"openPrice\": \"<string>\",\n \"slippagePercent\": \"1\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n \"trader\": \"<string>\",\n \"tradeIndex\": 1,\n \"additionalCollateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"delegate\": \"<string>\",\n \"openPrice\": \"<string>\",\n \"slippagePercent\": \"1\"\n}"
response = http.request(request)
puts response.read_body{
"ok": true,
"data": {
"to": "0x0000000000000000000000000000000000000000",
"from": "0x0000000000000000000000000000000000000000",
"data": "<string>",
"value": "0x0",
"chainId": 123,
"description": "<string>",
"meta": {
"pair": "<string>",
"pairIndex": 123,
"tradeIndex": 123,
"additionalCollateralUsdc": "<string>",
"coinExposure": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"openPrice": 123,
"slippagePercent": "<string>",
"delegated": true
}
}
}{
"ok": false,
"error": {
"code": "BAD_REQUEST",
"message": "<string>",
"details": "<unknown>"
}
}Build a position-increase transaction targeting a fixed base-asset exposure
Like /v2/position/increase, but the added size is expressed in base-asset units; the fill leverage floats within [minLeverage, maxLeverage].
curl --request POST \
--url https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin \
--header 'Content-Type: application/json' \
--data '
{
"trader": "<string>",
"tradeIndex": 1,
"additionalCollateralUsdc": "<string>",
"leverage": "<string>",
"coinExposure": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"pairIndex": 1,
"pair": "<string>",
"delegate": "<string>",
"openPrice": "<string>",
"slippagePercent": "1"
}
'import requests
url = "https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin"
payload = {
"trader": "<string>",
"tradeIndex": 1,
"additionalCollateralUsdc": "<string>",
"leverage": "<string>",
"coinExposure": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"pairIndex": 1,
"pair": "<string>",
"delegate": "<string>",
"openPrice": "<string>",
"slippagePercent": "1"
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({
trader: '<string>',
tradeIndex: 1,
additionalCollateralUsdc: '<string>',
leverage: '<string>',
coinExposure: '<string>',
minLeverage: '<string>',
maxLeverage: '<string>',
pairIndex: 1,
pair: '<string>',
delegate: '<string>',
openPrice: '<string>',
slippagePercent: '1'
})
};
fetch('https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin', 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://tx-builder-testnet.avantisfi.com/v2/position/increase-coin",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'trader' => '<string>',
'tradeIndex' => 1,
'additionalCollateralUsdc' => '<string>',
'leverage' => '<string>',
'coinExposure' => '<string>',
'minLeverage' => '<string>',
'maxLeverage' => '<string>',
'pairIndex' => 1,
'pair' => '<string>',
'delegate' => '<string>',
'openPrice' => '<string>',
'slippagePercent' => '1'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin"
payload := strings.NewReader("{\n \"trader\": \"<string>\",\n \"tradeIndex\": 1,\n \"additionalCollateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"delegate\": \"<string>\",\n \"openPrice\": \"<string>\",\n \"slippagePercent\": \"1\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin")
.header("Content-Type", "application/json")
.body("{\n \"trader\": \"<string>\",\n \"tradeIndex\": 1,\n \"additionalCollateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"delegate\": \"<string>\",\n \"openPrice\": \"<string>\",\n \"slippagePercent\": \"1\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://tx-builder-testnet.avantisfi.com/v2/position/increase-coin")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n \"trader\": \"<string>\",\n \"tradeIndex\": 1,\n \"additionalCollateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"delegate\": \"<string>\",\n \"openPrice\": \"<string>\",\n \"slippagePercent\": \"1\"\n}"
response = http.request(request)
puts response.read_body{
"ok": true,
"data": {
"to": "0x0000000000000000000000000000000000000000",
"from": "0x0000000000000000000000000000000000000000",
"data": "<string>",
"value": "0x0",
"chainId": 123,
"description": "<string>",
"meta": {
"pair": "<string>",
"pairIndex": 123,
"tradeIndex": 123,
"additionalCollateralUsdc": "<string>",
"coinExposure": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"openPrice": 123,
"slippagePercent": "<string>",
"delegated": true
}
}
}{
"ok": false,
"error": {
"code": "BAD_REQUEST",
"message": "<string>",
"details": "<unknown>"
}
}Body
The trader (position owner). USDC collateral is pulled from and paid out to this address.
Position slot index for this trader + pair (0-based; a trader can hold several positions on the same pair). Read it from GET /v2/positions → trades[].trade.index.
x >= 0Additional USDC collateral to add to the position.
Leverage applied to the added collateral.
Additional exposure to add, in base-asset units (e.g. 0.5 = 0.5 ETH on ETH/USD).
Lowest fill leverage you accept.
Highest fill leverage you accept.
Pair index (alternative to pair).
x >= 0Pair symbol, e.g. ETH/USD (separators /, -, _ accepted; case-insensitive).
1Optional pre-authorized delegate. When set, the call is wrapped in delegatedAction(trader, …) and from becomes this address — the delegate signs the transaction and pays gas. Register one via /v2/delegate/set.
Reference price for the increase; resolved from the live feed when omitted.
Max slippage in percent (1 = 1%).
Response
Success envelope: ok is true and data carries the payload documented below.