Build a signable open intent targeting a fixed base-asset exposure
curl --request POST \
--url https://tx-builder-testnet.avantisfi.com/v2/intents/open-coin \
--header 'Content-Type: application/json' \
--data '
{
"trader": "<string>",
"collateralUsdc": "<string>",
"leverage": "<string>",
"coinExposure": "<string>",
"pairIndex": 1,
"pair": "<string>",
"nonce": "<string>",
"deadlineMs": "<string>",
"orderType": "market",
"slippagePercent": "1",
"openPrice": "<string>",
"takeProfit": "<string>",
"stopLoss": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"skipValidation": false
}
'import requests
url = "https://tx-builder-testnet.avantisfi.com/v2/intents/open-coin"
payload = {
"trader": "<string>",
"collateralUsdc": "<string>",
"leverage": "<string>",
"coinExposure": "<string>",
"pairIndex": 1,
"pair": "<string>",
"nonce": "<string>",
"deadlineMs": "<string>",
"orderType": "market",
"slippagePercent": "1",
"openPrice": "<string>",
"takeProfit": "<string>",
"stopLoss": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"skipValidation": False
}
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>',
collateralUsdc: '<string>',
leverage: '<string>',
coinExposure: '<string>',
pairIndex: 1,
pair: '<string>',
nonce: '<string>',
deadlineMs: '<string>',
orderType: 'market',
slippagePercent: '1',
openPrice: '<string>',
takeProfit: '<string>',
stopLoss: '<string>',
minLeverage: '<string>',
maxLeverage: '<string>',
skipValidation: false
})
};
fetch('https://tx-builder-testnet.avantisfi.com/v2/intents/open-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/intents/open-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>',
'collateralUsdc' => '<string>',
'leverage' => '<string>',
'coinExposure' => '<string>',
'pairIndex' => 1,
'pair' => '<string>',
'nonce' => '<string>',
'deadlineMs' => '<string>',
'orderType' => 'market',
'slippagePercent' => '1',
'openPrice' => '<string>',
'takeProfit' => '<string>',
'stopLoss' => '<string>',
'minLeverage' => '<string>',
'maxLeverage' => '<string>',
'skipValidation' => false
]),
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/intents/open-coin"
payload := strings.NewReader("{\n \"trader\": \"<string>\",\n \"collateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"nonce\": \"<string>\",\n \"deadlineMs\": \"<string>\",\n \"orderType\": \"market\",\n \"slippagePercent\": \"1\",\n \"openPrice\": \"<string>\",\n \"takeProfit\": \"<string>\",\n \"stopLoss\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"skipValidation\": false\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/intents/open-coin")
.header("Content-Type", "application/json")
.body("{\n \"trader\": \"<string>\",\n \"collateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"nonce\": \"<string>\",\n \"deadlineMs\": \"<string>\",\n \"orderType\": \"market\",\n \"slippagePercent\": \"1\",\n \"openPrice\": \"<string>\",\n \"takeProfit\": \"<string>\",\n \"stopLoss\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"skipValidation\": false\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://tx-builder-testnet.avantisfi.com/v2/intents/open-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 \"collateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"nonce\": \"<string>\",\n \"deadlineMs\": \"<string>\",\n \"orderType\": \"market\",\n \"slippagePercent\": \"1\",\n \"openPrice\": \"<string>\",\n \"takeProfit\": \"<string>\",\n \"stopLoss\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"skipValidation\": false\n}"
response = http.request(request)
puts response.read_body{
"ok": true,
"data": {
"intent": "OpenTradeCoinExposureReq",
"domain": {
"name": "AvantisTrading",
"version": "1",
"chainId": 123,
"verifyingContract": "0x0000000000000000000000000000000000000000"
},
"primaryType": "OpenTradeCoinExposureReq",
"types": {},
"message": {
"_t": {
"trader": "0x0000000000000000000000000000000000000000",
"pairIndex": "<string>",
"index": "<string>",
"initialPosToken": "<string>",
"positionSizeUSDC": "<string>",
"openPrice": "<string>",
"buy": true,
"leverage": "<string>",
"tp": "<string>",
"sl": "<string>",
"timestamp": "<string>"
},
"_type": "<string>",
"_coinExposure": "<string>",
"_minLeverage": "<string>",
"_maxLeverage": "<string>",
"_slippageP": "<string>",
"_deadline": "<string>",
"_nonce": "<string>"
},
"digest": "<string>",
"encodedIntent": "<string>",
"meta": {
"pair": "<string>",
"pairIndex": 123,
"openPrice": 123,
"validation": {
"positionSizeUsdc": 123,
"pairAvailableUsdc": 123,
"groupAvailableUsdc": 123,
"availableUsdc": 123,
"minLeverage": 123,
"maxLeverage": 123,
"minPositionUsdc": 123,
"isPnl": true,
"marketOpen": true,
"nextOpenSec": 123,
"nextCloseSec": 123
}
}
}
}{
"ok": false,
"error": {
"code": "BAD_REQUEST",
"message": "<string>",
"details": "<unknown>"
}
}Intents
Build a signable open intent targeting a fixed base-asset exposure
Gasless equivalent of /v2/trade/open-coin: the fill targets an exact base-asset exposure with leverage floating within [minLeverage, maxLeverage]. Returns an EIP-712 payload to sign (trader or a registered delegate may sign) and hand to the Avantis operator for gasless execution.
POST
/
v2
/
intents
/
open-coin
Build a signable open intent targeting a fixed base-asset exposure
curl --request POST \
--url https://tx-builder-testnet.avantisfi.com/v2/intents/open-coin \
--header 'Content-Type: application/json' \
--data '
{
"trader": "<string>",
"collateralUsdc": "<string>",
"leverage": "<string>",
"coinExposure": "<string>",
"pairIndex": 1,
"pair": "<string>",
"nonce": "<string>",
"deadlineMs": "<string>",
"orderType": "market",
"slippagePercent": "1",
"openPrice": "<string>",
"takeProfit": "<string>",
"stopLoss": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"skipValidation": false
}
'import requests
url = "https://tx-builder-testnet.avantisfi.com/v2/intents/open-coin"
payload = {
"trader": "<string>",
"collateralUsdc": "<string>",
"leverage": "<string>",
"coinExposure": "<string>",
"pairIndex": 1,
"pair": "<string>",
"nonce": "<string>",
"deadlineMs": "<string>",
"orderType": "market",
"slippagePercent": "1",
"openPrice": "<string>",
"takeProfit": "<string>",
"stopLoss": "<string>",
"minLeverage": "<string>",
"maxLeverage": "<string>",
"skipValidation": False
}
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>',
collateralUsdc: '<string>',
leverage: '<string>',
coinExposure: '<string>',
pairIndex: 1,
pair: '<string>',
nonce: '<string>',
deadlineMs: '<string>',
orderType: 'market',
slippagePercent: '1',
openPrice: '<string>',
takeProfit: '<string>',
stopLoss: '<string>',
minLeverage: '<string>',
maxLeverage: '<string>',
skipValidation: false
})
};
fetch('https://tx-builder-testnet.avantisfi.com/v2/intents/open-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/intents/open-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>',
'collateralUsdc' => '<string>',
'leverage' => '<string>',
'coinExposure' => '<string>',
'pairIndex' => 1,
'pair' => '<string>',
'nonce' => '<string>',
'deadlineMs' => '<string>',
'orderType' => 'market',
'slippagePercent' => '1',
'openPrice' => '<string>',
'takeProfit' => '<string>',
'stopLoss' => '<string>',
'minLeverage' => '<string>',
'maxLeverage' => '<string>',
'skipValidation' => false
]),
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/intents/open-coin"
payload := strings.NewReader("{\n \"trader\": \"<string>\",\n \"collateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"nonce\": \"<string>\",\n \"deadlineMs\": \"<string>\",\n \"orderType\": \"market\",\n \"slippagePercent\": \"1\",\n \"openPrice\": \"<string>\",\n \"takeProfit\": \"<string>\",\n \"stopLoss\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"skipValidation\": false\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/intents/open-coin")
.header("Content-Type", "application/json")
.body("{\n \"trader\": \"<string>\",\n \"collateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"nonce\": \"<string>\",\n \"deadlineMs\": \"<string>\",\n \"orderType\": \"market\",\n \"slippagePercent\": \"1\",\n \"openPrice\": \"<string>\",\n \"takeProfit\": \"<string>\",\n \"stopLoss\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"skipValidation\": false\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://tx-builder-testnet.avantisfi.com/v2/intents/open-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 \"collateralUsdc\": \"<string>\",\n \"leverage\": \"<string>\",\n \"coinExposure\": \"<string>\",\n \"pairIndex\": 1,\n \"pair\": \"<string>\",\n \"nonce\": \"<string>\",\n \"deadlineMs\": \"<string>\",\n \"orderType\": \"market\",\n \"slippagePercent\": \"1\",\n \"openPrice\": \"<string>\",\n \"takeProfit\": \"<string>\",\n \"stopLoss\": \"<string>\",\n \"minLeverage\": \"<string>\",\n \"maxLeverage\": \"<string>\",\n \"skipValidation\": false\n}"
response = http.request(request)
puts response.read_body{
"ok": true,
"data": {
"intent": "OpenTradeCoinExposureReq",
"domain": {
"name": "AvantisTrading",
"version": "1",
"chainId": 123,
"verifyingContract": "0x0000000000000000000000000000000000000000"
},
"primaryType": "OpenTradeCoinExposureReq",
"types": {},
"message": {
"_t": {
"trader": "0x0000000000000000000000000000000000000000",
"pairIndex": "<string>",
"index": "<string>",
"initialPosToken": "<string>",
"positionSizeUSDC": "<string>",
"openPrice": "<string>",
"buy": true,
"leverage": "<string>",
"tp": "<string>",
"sl": "<string>",
"timestamp": "<string>"
},
"_type": "<string>",
"_coinExposure": "<string>",
"_minLeverage": "<string>",
"_maxLeverage": "<string>",
"_slippageP": "<string>",
"_deadline": "<string>",
"_nonce": "<string>"
},
"digest": "<string>",
"encodedIntent": "<string>",
"meta": {
"pair": "<string>",
"pairIndex": 123,
"openPrice": 123,
"validation": {
"positionSizeUsdc": 123,
"pairAvailableUsdc": 123,
"groupAvailableUsdc": 123,
"availableUsdc": 123,
"minLeverage": 123,
"maxLeverage": 123,
"minPositionUsdc": 123,
"isPnl": true,
"marketOpen": true,
"nextOpenSec": 123,
"nextCloseSec": 123
}
}
}
}{
"ok": false,
"error": {
"code": "BAD_REQUEST",
"message": "<string>",
"details": "<unknown>"
}
}Body
application/json
The trader (position owner). USDC collateral is pulled from and paid out to this address.
Position direction: long or short.
Available options:
long, short Collateral (margin) in USDC, human units — e.g. 100 = 100 USDC. Position size = collateral × leverage.
Leverage as a plain multiplier (10 = 10x).
Position exposure in base-asset units (e.g. 0.5 = 0.5 ETH on ETH/USD).
Pair index (alternative to pair).
Required range:
x >= 0Pair symbol, e.g. ETH/USD (separators /, -, _ accepted; case-insensitive).
Minimum string length:
1Replay-protection nonce (uint256; unordered Permit2-style bitmap, not sequential). A random one is generated when omitted — only pass a value to pre-reserve or deterministically retry an intent. Check availability via GET /v2/nonce.
Intent expiry as a unix timestamp in MILLISECONDS (not seconds). Defaults to now + the service value shown in /v2/meta → defaults.intentDeadlineMs.
Open order type: market (immediate), limit / stop_limit (queued at openPrice), or market_pnl (zero-fee, profit-share on close).
Available options:
market, stop_limit, limit, market_pnl, market_zero_fee Max slippage in percent (1 = 1%).
Entry price in USD. Market orders: optional override, resolved from the live price feed when omitted. Limit / stop-limit orders: the trigger price (required).
Take-profit price in USD. 0 or omitted = no take-profit (0 also removes an existing one on updates).
Stop-loss price in USD. 0 or omitted = no stop-loss (0 also removes an existing one on updates).
Lowest fill leverage you accept; defaults to the pair minimum.
Highest fill leverage you accept; defaults to the pair maximum.
Skip server-side pre-trade validation (listing, min position, leverage bounds, liquidity, market hours) and just encode the call. The chain still enforces all limits.
Response
Success envelope: ok is true and data carries the payload documented below.
Always true on success.
Available options:
true A ready-to-sign EIP-712 payload. Sign {domain, types, primaryType, message} with signTypedData (trader or a registered delegate, per signerRule) and hand the 65-byte r||s||v signature to the Avantis service that executes this intent kind.
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