GET
/
fx
/
rates
/
indicative
Get indicative FX rate.
curl --request GET \
  --url https://sandbox.api.openfx.com/v1/fx/rates/indicative \
  --header 'Authorization: Bearer <token>' \
  --header 'X-Signature: <api-key>' \
  --header 'X-Timestamp: <api-key>'
{
  "sellCurrency": "USD",
  "buyCurrency": "USD",
  "rate": "1.0848",
  "timestamp": "2026-02-23T12:00:00Z",
  "inverseRate": "0.9218"
}

Authorizations

​
Authorization
string
header
required

API key issued at onboarding. Passed as a Bearer token in the Authorization header: Authorization: Bearer <api-key>. Identifies the caller and determines organization scope. Invalid or revoked keys return 401 with error type authentication_error.

​
X-Signature
string
header
required

Ed25519 or RSA-SHA256 asymmetric signature over the request payload (ADR-0015). Provides request integrity and non-repudiation. The signature covers the HTTP method, path, query string, request body, and timestamp. Invalid signatures return 401 with error type authentication_error.

​
X-Timestamp
string
header
required

Unix timestamp (seconds) of when the request was signed. Server rejects requests where the timestamp drifts beyond +/-60 seconds from server time to prevent replay attacks. Must match the timestamp used in the signature computation.

Query Parameters

​
sellCurrency
string
required

ISO 4217 currency code for fiat (USD, EUR, GBP) or crypto asset ticker (USDC, BTC, ETH). Uppercase, 2-10 characters. Use this type in contexts where both fiat currencies and crypto assets are accepted.

Pattern: ^[A-Z]{2,10}$
Example:

"USD"

​
buyCurrency
string
required

ISO 4217 currency code for fiat (USD, EUR, GBP) or crypto asset ticker (USDC, BTC, ETH). Uppercase, 2-10 characters. Use this type in contexts where both fiat currencies and crypto assets are accepted.

Pattern: ^[A-Z]{2,10}$
Example:

"USD"

Response

Indicative rate.

Non-binding indicative FX rate. Not locked — for display only.

​
sellCurrency
string
required

ISO 4217 currency code for fiat (USD, EUR, GBP) or crypto asset ticker (USDC, BTC, ETH). Uppercase, 2-10 characters. Use this type in contexts where both fiat currencies and crypto assets are accepted.

Pattern: ^[A-Z]{2,10}$
Example:

"USD"

​
buyCurrency
string
required

ISO 4217 currency code for fiat (USD, EUR, GBP) or crypto asset ticker (USDC, BTC, ETH). Uppercase, 2-10 characters. Use this type in contexts where both fiat currencies and crypto assets are accepted.

Pattern: ^[A-Z]{2,10}$
Example:

"USD"

​
rate
string
required
Example:

"1.0848"

​
timestamp
string<date-time>
required

UTC timestamp in RFC 3339 / ISO 8601 format.

Example:

"2026-02-23T12:00:00Z"

​
inverseRate
string
Example:

"0.9218"