ExchangeRate-API

Keyless fiat provider, enabled by default. The open endpoint covers 166 currencies and updates once a day, with no signup.

Not the same as ExchangeRate.host

ExchangeRateApi is the keyless open.er-api.com endpoint documented here. ExchangeRateHost is an unrelated, key-requiring provider with a confusingly similar name.

Property	Value
Connector name	ExchangeRateApi
Config key	exchange_rate_api
Website	exchangerate-api.com
Endpoint	open.er-api.com/v6/latest/USD
Credential	None
Covers	166 fiat currencies, updated daily
Default weight	10

Configuration

{
  "exchange_rate_api": {
    "enabled": true,
    "url": "https://open.er-api.com/v6/latest/USD",
    "codes": ["USD", "RUB", "EUR", "CNY", "JPY"]
  }
}

Field	Type	Description
enabled	boolean	Required when the block is present. true in the shipped template
weight	number ≥ 0	Voting power in group selection, defaults to 10
url	HTTP(S) URL	Endpoint. Required
codes	string array	Fiat codes to request. Required when enabled

The block is validated as a whole: if exchange_rate_api is present, enabled and url must both be set. Delete the whole block to drop the source rather than emptying it.

Fiat only

BTC, ETH, and other crypto assets are not covered by this endpoint and must not be listed in codes. The crypto sources quote them far more frequently and far more accurately.

The base currency is part of the path

The connector inverts the upstream rates map — which is quoted as "units of X per 1 USD" — into X/USD pairs. A response quoted against anything other than USD would be mislabelled rather than converted, so USD must stay in the URL path. The connector verifies base_code in the response and refuses a mismatch.

Errors arrive with HTTP 200

The endpoint answers 200 even on failure, and signals the outcome in the body:

{ "result": "error", "error-type": "invalid-key" }

The connector treats result as the only reliable success indicator, so a failure is reported rather than parsed as an empty rate set.

Update frequency

Once a day. Refreshing more often does not produce newer numbers; it only spends requests. This is normal for fiat: currency rates move slowly compared to crypto, and the divergence check against Currency API is what catches a bad one.

Terms

Keyless access is not permission to republish

• Private or development instance, rates consumed by you: permitted, and attribution is required. Add a link to https://www.exchangerate-api.com where the rates are shown, reading "Rates By Exchange Rate API"
• Public or commercial instance serving these rates onwards: not permitted. Contact the provider for written redistribution permission, or set "enabled": false

See the provider's free tier terms.

Troubleshooting

Symptom	Cause
A code never appears	Not among the 166 supported currencies, or it is a crypto asset
Repeated fetch failures	The endpoint answered result: "error". The log carries the error-type
Rates look a day old	They are. This endpoint updates once a day by design