frankfurter.currency.series
Fetch a time series of ECB exchange rates between two dates from Frankfurter.dev. Returns a date-keyed map of rates covering every business day in the range. Coverage starts from 1999-01-04. Omit end_date to get rates through the latest available date. Narrow results to specific currencies with t...
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What frankfurter.currency.series does on Apibase
AI agents call frankfurter.currency.series to retrieve information from Apibase without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
base | string | — | Base currency ISO 4217 code (default: EUR). Supported: AUD,BRL,CAD,CHF,CNY,CZK,DKK,EUR,GBP,HKD,HUF,IDR,ILS,INR,ISK,JPY,KRW,MXN,MYR,NOK,NZD,PHP,PLN,RON,SEK,SGD,T |
amount | number | — | Amount to convert (default: 1.0). |
symbols | string | — | Comma-separated target currency codes (e.g. USD,GBP,JPY). Omit for all 33 currencies. Use specific symbols to reduce response size. |
end_date | string | — | End date of the time series in YYYY-MM-DD format. Defaults to the latest available date. |
start_date | string | Yes | Start date of the time series in YYYY-MM-DD format. ECB data available from 1999-01-04. |
Parameters from the server's own tool schema.
Why frankfurter.currency.series is rated Low
Retrieves historical exchange rate data without side effects or mutation capabilities.
From the tool's definition Fetch time series, returns date-keyed map, no auth required, public ECB data
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
The rule that runs frankfurter.currency.series safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Apibase, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For frankfurter.currency.series, this is the rule to start with:
frankfurter.currency.series is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Apibase, apply this rule, and every frankfurter.currency.series call is checked against it from then on.
Questions about frankfurter.currency.series
Fetch a time series of ECB exchange rates between two dates from Frankfurter.dev. Returns a date-keyed map of rates covering every business day in the range. Coverage starts from 1999-01-04. Omit end_date to get rates through the latest available date. Narrow results to specific currencies with the symbols parameter to reduce response size. Use for trend analysis, backtesting, historical P&L calculations, and charting FX movements. No auth required; public domain ECB data. It is categorised as a Read tool in the Apibase MCP Server, which means it retrieves data without modifying state.
frankfurter.currency.series accepts 5 parameters: base, amount, symbols, end_date, start_date. Required: start_date. The full parameter table on this page comes from the server's own tool schema.
Register the Apibase MCP server in PolicyLayer and add a rule for frankfurter.currency.series: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Apibase. Nothing to install.
frankfurter.currency.series is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the frankfurter.currency.series rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for frankfurter.currency.series. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
frankfurter.currency.series is provided by the Apibase MCP server (apibase-mcp-client). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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