Use REST for FX snapshots, metadata and historical requests when an application does not require every streaming update.
A successful HTTP response can still contain an old quote. Require an observation timestamp and define freshness expectations for the consumer; polling frequency and endpoint caching should match the application's tolerance for delay.
Agree symbol filters, pagination, rate limits and error responses. For historical ranges, define timestamp boundaries and the price basis, then verify that repeated requests produce consistent coverage without overlapping records.
Bring the proposed instrument list, source documentation and consumer workflow to a technical discussion. The agreed integration specification defines coverage, fields, usage permissions and acceptance tests.
| Resource scope | Confirm whether a request returns latest quotes, instrument metadata, candles or raw ticks. |
|---|---|
| Time semantics | Specify source time, requested interval boundaries, timezone and ordering. |
| Response contract | Define field types, missing-value handling, pagination and error responses. |
| Usage limits | Confirm authentication, rate limits, retry guidance and permitted retention. |
A REST workflow for Forex should identify the timestamp of the returned observation and distinguish missing data from an empty result. If streaming is also used, establish how a snapshot aligns with the subsequent updates before combining the two views.
{
"type": "quote",
"symbol": "EURUSD",
"bid": "1.10000",
"ask": "1.10010",
"source_time": "2026-10-18T12:00:00.000Z",
"received_at": "2026-10-18T12:00:00.012Z",
"source_id": "example-source",
"status": "illustrative"
}Illustrative engineering example, not live prices or a published API contract. Confirm field names and delivery rules during integration.