Ambolt exchange rate API
The exchange rate API from Ambolt — 1 operation(s) for exchange rate.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Ambolt data tools exchange rate API
version: 0.1.1
description: Pay-per-call data endpoints using the x402 protocol (USDC on Base, Polygon and Solana). Failed calls are not charged.
x-guidance: 'Call GET /v1/<tool> with the documented query parameters. Without payment the response is 402 with the price and payment requirements; an x402 client pays in USDC and retries. Add free=1 for one free call per tool and IP per day. Company, tender, document, rates, on-chain and web tools; every response carries source and date. The same tools are available as MCP tools at /mcp (free, 30 requests a minute) and as Apify Actors. Company-level data only: no personal data.'
contact:
email: hello@ambolt.dev
url: https://ambolt.dev
servers:
- url: https://api.ambolt.dev
security: []
tags:
- name: exchange rate
paths:
/v1/fx-rate-ecb:
get:
operationId: fx_rate_ecb
summary: 'ECB Exchange Rates: Latest and Historical Reference Rates'
description: European Central Bank euro foreign-exchange reference rates for any date since 1999, converted to any base currency. Reference rates published around 16:00 CET on working days; not tradable quotes.
tags:
- exchange rate
parameters:
- name: base
in: query
required: false
schema:
type: string
pattern: ^[A-Za-z]{3}$
default: EUR
description: Base currency, ISO 4217.
description: Base currency, ISO 4217.
- name: symbols
in: query
required: false
schema:
type: array
maxItems: 40
items:
type: string
pattern: ^[A-Za-z]{3}$
description: 'Target currencies. Default: all.'
description: 'Target currencies. Default: all.'
- name: date
in: query
required: false
schema:
type: string
pattern: ^\d{4}-\d{2}-\d{2}$
description: 'YYYY-MM-DD. Default: latest. Weekends and holidays return the previous working day.'
description: 'YYYY-MM-DD. Default: latest. Weekends and holidays return the previous working day.'
- name: amount
in: query
required: false
schema:
type: number
minimum: 0
maximum: 1000000000000
default: 1
description: Amount of base currency to convert.
description: Amount of base currency to convert.
- name: free
in: query
required: false
schema:
type: string
enum:
- '1'
description: Set to 1 for one free call per tool and IP address per day (no payment).
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.003000'
protocols:
- x402: {}
responses:
'200':
description: Result (JSON). Every result names its source and the time it was read.
content:
application/json:
schema:
type: object
'400':
description: Invalid input; not charged.
'402':
description: 'Payment required: 0.003 USD in USDC (x402 v2).'