# Saylor Innovations — Reference Exchange Rates

> Saylor Innovations — Reference Exchange Rates is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-30).

Returns daily ECB reference exchange rates for a given base currency, including the observation date, all currency pair rates, and a data source attribution.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/data/exchange-rates?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-reference-exchange-rates-afed419b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KEF17bVYEf9HLiR2CYPCc

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 saylor-innovations-reference-exchange-rates-afed419b
```

Example prompt: What are today's ECB daily reference exchange rates for USD — I need the official rates against all available currencies for my accounting records.

## When to prefer this

Use this endpoint when you need official ECB daily reference exchange rates for bookkeeping, financial reporting, compliance, or informational lookups — not for live trading quotes or real-time market prices. Prefer this over scraping ecb.europa.eu directly when you want a structured JSON response with source attribution and a retrieval timestamp, and when you need it in an agent workflow that supports x402 micropayments.

## Known failure modes

- Unsupported or invalid currency code (base not in ECB feed) — likely returns an error or empty rates
- ECB source data temporarily unavailable — may return stale or error response
- Malformed query parameter — schema validation error
- Rate limit or payment failure — 402 response if x402 payment not processed

## How this service works

Get daily reference exchange rates per one unit of a base currency, with observation date and currency codes. Not executable trading quotes. ECB source data is also available free from ecb.europa.eu.

## Output

A JSON object containing the service name, subject, retrieval timestamp (ISO 8601), source attribution (ECB name and URL), and a report object with the base currency code, observation date, amount (1 unit), a map of all available currency codes to their rates relative to the base, and a notice (e.g. disclaiming these are reference rates, not executable trading quotes).

## 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",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "base"
     ],
     "properties": {
      "base": {
       "type": "string",
       "description": "Three-letter currency code supported by the ECB reference-rate feed, for example USD or EUR."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "service",
      "subject",
      "retrievedAt",
      "source",
      "report"
     ],
     "properties": {
      "report": {
       "type": "object",
       "required": [
        "base",
        "date",
        "amount",
        "rates",
        "notice"
       ],
       "properties": {
        "base": {
         "type": "string"
        },
        "date": {
         "type": "string"
        },
        "rates": {
         "type": "object",
         "additionalProperties": {
          "type": "number"
         }
        },
        "amount": {
         "type": "number"
        },
        "notice": {
         "type": "string"
        }
       }
      },
      "source": {
       "type": "object",
       "required": [
        "name",
        "url"
       ],
       "properties": {
        "url": {
         "type": "string",
         "format": "uri"
        },
        "name": {
         "type": "string"
        }
       }
      },
      "service": {
       "type": "string"
      },
      "subject": {
       "type": "string"
      },
      "retrievedAt": {
       "type": "string",
       "format": "date-time"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-reference-exchange-rates-afed419b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)