# Ambolt ECB Key Interest Rates

> Ambolt ECB Key Interest Rates is a paid API for AI agents from api.ambolt.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).

Returns the European Central Bank's three key policy interest rates (deposit facility, main refinancing, and marginal lending) with recent historical observations.

## Facts

- Endpoint: GET https://api.ambolt.dev/v1/ecb-key-rates?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ambolt-ecb-key-interest-rates-4c2d0cbe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T3mA4YCChP8UB2sG7__Wm

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 ambolt-ecb-key-interest-rates-4c2d0cbe
```

Example prompt: What are the current ECB key interest rates? Give me the last 6 observations for each rate so I can see the recent trend.

## When to prefer this

Choose this endpoint when you need real-time or recently cached ECB official policy interest rates with historical context in a single structured call, especially in agent workflows that require micropayment-friendly (x402) access without API key management. Prefer this over scraping ECB website directly or using general financial data APIs when you specifically need the three ECB key rates with clean JSON output and per-call pricing.

## Known failure modes

- Payment required (402) if x402 micropayment header is missing or insufficient
- ECB Data Portal upstream unavailable — may return 5xx or stale data
- Invalid history parameter (outside 1–24 range) returns validation error
- Network timeout if ECB source is slow to respond

## How this service works

Pay-per-call data tools for developers and AI agents: company registers, documents, tenders, rates and on-chain facts as MCP tools, x402 endpoints and Apify Actors.

## Output

A JSON object containing an array of three ECB rate series (deposit facility, main refinancing operations, marginal lending facility), each with a key, human-readable label, the latest rate observation (date + percentage), and a configurable number of historical observations. Also includes source attribution text and a fetchedAt timestamp.

## 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"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST"
     ]
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "history": {
       "type": "integer",
       "default": 4,
       "maximum": 24,
       "minimum": 1,
       "description": "Number of most recent rate observations per series."
      }
     },
     "additionalProperties": false
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "rates": [
   {
    "key": "deposit_facility",
    "label": "Deposit facility rate",
    "latest": {
     "date": "2026-09-16",
     "ratePct": 2.5
    },
    "history": [
     {
      "date": "2026-09-16",
      "ratePct": 2.5
     },
     {
      "date": "2026-06-17",
      "ratePct": 2.25
     }
    ]
   },
   {
    "key": "main_refinancing",
    "label": "Main refinancing operations rate (fixed)",
    "latest": {
     "date": "2026-09-16",
     "ratePct": 2.65
    },
    "history": [
     {
      "date": "2026-09-16",
      "ratePct": 2.65
     },
     {
      "date": "2026-06-17",
      "ratePct": 2.4
     }
    ]
   },
   {
    "key": "marginal_lending",
    "label": "Marginal lending facility rate",
    "latest": {
     "date": "2026-09-16",
     "ratePct": 2.9
    },
    "history": [
     {
      "date": "2026-09-16",
      "ratePct": 2.9
     },
     {
      "date": "2026-06-17",
      "ratePct": 2.65
     }
    ]
   }
  ],
  "source": "Source: European Central Bank, ECB Data Portal (reuse permitted with attribution). Dates are the series' observation dates.",
  "fetchedAt": "2026-10-02T21:35:42.198Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ambolt-ecb-key-interest-rates-4c2d0cbe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.ambolt.dev](https://www.zero.xyz/host/api.ambolt.dev/llms.txt)