Tools

Quote a currency conversion

Prices a conversion for a payment to an international-fx account denominated in a currency other than USD, and returns a short-lived quoteToken that locks the rate.

Pass the token as fxQuoteToken on POST /payments to be charged exactly what was quoted. The token is optional — omit it and the payment is priced again at creation time, at whatever rate then applies.

Fees are priced separately by POST /tools/fee-calculator; the two are independent and can be called in either order.

POST

tools

fx-quote

Quote a currency conversion

const options = {
  method: 'POST',
  headers: {
    'Melio-Entity-Id': '<melio-entity-id>',
    'api-key': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    receivingAccountId: 'acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7',
    amount: 100000,
    currency: 'EUR',
    purpose: 'payment for consulting services'
  })
};

fetch('https://api.melio.com/v2/tools/fx-quote', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.melio.com/v2/tools/fx-quote"

payload = {
    "receivingAccountId": "acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7",
    "amount": 100000,
    "currency": "EUR",
    "purpose": "payment for consulting services"
}
headers = {
    "Melio-Entity-Id": "<melio-entity-id>",
    "api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

curl --request POST \
  --url https://api.melio.com/v2/tools/fx-quote \
  --header 'Content-Type: application/json' \
  --header 'Melio-Entity-Id: <melio-entity-id>' \
  --header 'api-key: <api-key>' \
  --data '
{
  "receivingAccountId": "acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7",
  "amount": 100000,
  "currency": "EUR",
  "purpose": "payment for consulting services"
}
'

HttpResponse<String> response = Unirest.post("https://api.melio.com/v2/tools/fx-quote")
  .header("Melio-Entity-Id", "<melio-entity-id>")
  .header("api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"receivingAccountId\": \"acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7\",\n  \"amount\": 100000,\n  \"currency\": \"EUR\",\n  \"purpose\": \"payment for consulting services\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.melio.com/v2/tools/fx-quote")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Melio-Entity-Id"] = '<melio-entity-id>'
request["api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"receivingAccountId\": \"acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7\",\n  \"amount\": 100000,\n  \"currency\": \"EUR\",\n  \"purpose\": \"payment for consulting services\"\n}"

response = http.request(request)
puts response.read_body

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.melio.com/v2/tools/fx-quote"

	payload := strings.NewReader("{\n  \"receivingAccountId\": \"acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7\",\n  \"amount\": 100000,\n  \"currency\": \"EUR\",\n  \"purpose\": \"payment for consulting services\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Melio-Entity-Id", "<melio-entity-id>")
	req.Header.Add("api-key", "<api-key>")
	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))

}

{
  "currency": "EUR",
  "foreignAmount": 100000,
  "amount": 110250,
  "usdToForeignRate": 0.907,
  "midMarketRate": 0.9125,
  "quoteToken": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb3JlaWduQ3VycmVuY3kiOiJFVVIifQ.sig",
  "expiresAt": "2026-09-06T12:34:56Z"
}

{
  "error": {
    "type": "invalid_request_error",
    "code": "VALIDATION_ERROR",
    "message": "<string>",
    "details": {}
  }
}

{
  "error": {
    "type": "invalid_request_error",
    "code": "VALIDATION_ERROR",
    "message": "<string>",
    "details": {}
  }
}

Authorizations

api-key

string

header

required

Headers

Melio-Entity-Id

string

required

Entity the request operates on — an entity id (ent_<uuid>) or me (the partner's sole entity).

Body

application/json

Only accounts that actually convert currency can be quoted: an international-fx account denominated in something other than USD. Anything else — a domestic account, a USD-denominated international account, or international-gusd, which is dollar-denominated — is rejected with 400.

receivingAccountId

string

required

External receiving account id (acct_), the credit account

amount

integer

required

Minor units of currency — the amount the counterparty would receive.

currency

string

Must match the receiving account's currency. Optional, but sending it turns a wrong assumption into a 400 instead of a quote in an unexpected currency.

Pattern: ^[A-Za-z]{3}$

purpose

string

Why the money is being sent. Used to price the quote, so send the same value you will send as compliance.purpose on the payment.

Response

The priced conversion and the token that locks it.

A priced currency conversion. foreignAmount is what the counterparty receives and amount is what the entity is debited, both in minor units of their own currency and both excluding fees.

currency

string

required

ISO 4217 code of the currency delivered

foreignAmount

integer

required

Minor units of currency delivered to the counterparty

amount

integer

required

Minor units of USD debited from the entity, before fees

usdToForeignRate

number

required

The applied rate: units of currency per USD

quoteToken

string

required

Opaque, short-lived token locking this rate. Pass it as fxQuoteToken on POST /payments, for a payment of this amount in this currency — the token is checked against both, so it cannot be spent on a payment it was not quoted for. Treat it as opaque; its format is not part of this contract.

midMarketRate

number

The mid-market reference rate, for comparison

expiresAt

string<date-time>

When the token stops being accepted. After this, quote again.

Quote a currency conversion

const options = {
  method: 'POST',
  headers: {
    'Melio-Entity-Id': '<melio-entity-id>',
    'api-key': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    receivingAccountId: 'acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7',
    amount: 100000,
    currency: 'EUR',
    purpose: 'payment for consulting services'
  })
};

fetch('https://api.melio.com/v2/tools/fx-quote', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.melio.com/v2/tools/fx-quote"

payload = {
    "receivingAccountId": "acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7",
    "amount": 100000,
    "currency": "EUR",
    "purpose": "payment for consulting services"
}
headers = {
    "Melio-Entity-Id": "<melio-entity-id>",
    "api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

curl --request POST \
  --url https://api.melio.com/v2/tools/fx-quote \
  --header 'Content-Type: application/json' \
  --header 'Melio-Entity-Id: <melio-entity-id>' \
  --header 'api-key: <api-key>' \
  --data '
{
  "receivingAccountId": "acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7",
  "amount": 100000,
  "currency": "EUR",
  "purpose": "payment for consulting services"
}
'

HttpResponse<String> response = Unirest.post("https://api.melio.com/v2/tools/fx-quote")
  .header("Melio-Entity-Id", "<melio-entity-id>")
  .header("api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"receivingAccountId\": \"acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7\",\n  \"amount\": 100000,\n  \"currency\": \"EUR\",\n  \"purpose\": \"payment for consulting services\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.melio.com/v2/tools/fx-quote")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Melio-Entity-Id"] = '<melio-entity-id>'
request["api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"receivingAccountId\": \"acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7\",\n  \"amount\": 100000,\n  \"currency\": \"EUR\",\n  \"purpose\": \"payment for consulting services\"\n}"

response = http.request(request)
puts response.read_body

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.melio.com/v2/tools/fx-quote"

	payload := strings.NewReader("{\n  \"receivingAccountId\": \"acct_2a4f9c31-77ad-4c1e-8b52-6d3f0a91c4e7\",\n  \"amount\": 100000,\n  \"currency\": \"EUR\",\n  \"purpose\": \"payment for consulting services\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Melio-Entity-Id", "<melio-entity-id>")
	req.Header.Add("api-key", "<api-key>")
	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))

}

{
  "currency": "EUR",
  "foreignAmount": 100000,
  "amount": 110250,
  "usdToForeignRate": 0.907,
  "midMarketRate": 0.9125,
  "quoteToken": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb3JlaWduQ3VycmVuY3kiOiJFVVIifQ.sig",
  "expiresAt": "2026-09-06T12:34:56Z"
}

{
  "error": {
    "type": "invalid_request_error",
    "code": "VALIDATION_ERROR",
    "message": "<string>",
    "details": {}
  }
}

{
  "error": {
    "type": "invalid_request_error",
    "code": "VALIDATION_ERROR",
    "message": "<string>",
    "details": {}
  }
}

Entities

Accounts

Attachments

Payments

Tools

Quote a currency conversion

Authorizations

Headers

Body

Response