Frankfurter v2

Use this skill for daily reference exchange-rate work. Frankfurter v2 returns daily reference exchange rates, not executable trading quotes.

Load the current contract

Do not memorize Endpoint names, parameters, response fields, providers, auth, generated symbols, or package versions. Resolve them for the current task:

pontx-hub search "Frankfurter v2 <capability>" --type endpoint --json
pontx-hub show <returned-resource-id>
pontx-hub sdk frankfurter-v2

Use @pontx/frankfurter-v2 for application integration. Use pontx-frankfurter-v2 only for a single-product script, and derive its current commands from SDK metadata rather than guessing.

Use the flat collection form shown by the live contract:

pontx-hub frankfurter-v2 preview <api-name> <named-options>
pontx-hub frankfurter-v2 call <api-name> <named-options>

Preview the resolved request first. Execute the unchanged GET only when the user explicitly approves live retrieval. Never expose or invent a credential.

Choose rate semantics first

Clarify the pair or quote set, observation date or range, intended use, and required provider before constructing a request.

The default v2 result blends providers, while provider filtering is required when a specific official source controls a tax, accounting, or compliance calculation. Ask which jurisdiction or publishing authority controls the rule. Never silently replace a missing provider-specific observation with the blend.

A pinned provider can publish on a different cadence, so its latest observation can lag the blended result. Report the returned observation date and do not relabel it as today's rate. When attribution is requested, retain contributor information; a peg-derived row may not have provider attribution.

Integrate deliberately

• Fetch the rate only and keep the monetary amount in application code. Use decimal-safe arithmetic for accounting, round at the declared business boundary, and format the target currency for the user's locale.
• For an audit, retain the normalized query, provider, observation date, retrieval time, and raw response used by the calculation.
• For long ranges, narrow quotes and providers and choose weekly or monthly grouping when daily resolution is unnecessary. For large responses, choose a streaming representation from the live contract instead of buffering the full export.
• If live retrieval fails, re-inspect the current contract and preserve the required provider semantics while choosing a smaller request.
• Handle every non-success response explicitly. Validate identifiers through the current contract instead of inventing a currency or provider key.

If product guidance conflicts with Pontx metadata, stop and surface the conflict. Do not bypass the catalog with a guessed request.

Few-shot workflows

Scenario 1: Display conversion

User: "Show an approximate EUR value for a USD cart total."

Approach: Apply the rate-semantics and local-conversion workflow above, inspect the live single-pair contract, preview it, and retrieve only after explicit approval. Preserve the returned observation context.

Scenario 2: Auditable official rate

User: "Convert an invoice using the authority required by our jurisdiction."

Approach: Apply the provider-selection and audit workflow above, ask for the controlling authority if absent, preview the exact live contract, and do not silently change its semantics.

Scenario 3: Large attributed history

User: "Analyze a decade of monthly rates with attribution under a memory limit."

Approach: Apply the large-range workflow above after inspecting current grouping, attribution, provider, and representation support. Preserve rate semantics while verifying dates and ordering.