# Suverse FX Historical Date – ECB Exchange Rates by Date

> Suverse FX Historical Date – ECB Exchange Rates by Date is a paid API for AI agents from proxy.suverse.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Returns ECB reference exchange rates for a specified historical date and base currency via the Frankfurter API, requiring no API key.

## Facts

- Endpoint: POST https://proxy.suverse.io/v1/data/suverse-fx-historical-date
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/suverse-fx-historical-date-ecb-exchange-rates-by-date-84042138
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WV0Ra2LP1odjYplC7Cwip

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability suverse-fx-historical-date-ecb-exchange-rates-by-date-84042138 -d '<json body>'
```

Example prompt: What was the ECB reference exchange rate from EUR to USD on March 14, 2023? I need it to reconcile an old transaction.

## When to prefer this

Choose this endpoint when you need official ECB reference exchange rates for a specific past date and have no API key for Frankfurter or similar services. It is ideal for financial reconciliation, accounting, audit compliance, and historical valuation tasks where ECB-published rates are the authoritative source. Prefer this over live-rate endpoints when the query is explicitly historical rather than current.

## Known failure modes

- Date outside ECB historical data range (pre-1999) returns an error
- Weekend or holiday dates may return nearest available prior rates rather than the exact date
- Invalid currency code returns an error or empty rates object
- Malformed date format causes a validation error
- ECB data unavailable for very recent dates (rates published with a short delay)

## How this service works

ECB reference exchange rates on a specific historical date for a base currency via Frankfurter, no key. For AI agents reconciling past transactions and historical valuation.

## Output

Returns a JSON object containing the requested historical date, the base currency, and a map of target currency codes to their ECB reference exchange rates as published on that date. If the date falls on a weekend or holiday when ECB does not publish rates, the nearest prior business day's rates are typically returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/suverse-fx-historical-date-ecb-exchange-rates-by-date-84042138/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from proxy.suverse.io](https://www.zero.xyz/host/proxy.suverse.io/llms.txt)