Crypto From Base

Returns live exchange rates from a specified base currency to all supported cryptocurrencies. The base can be either a fiat currency (e.g. USD) or a cryptocurrency (e.g. BTC).

Use this to:

• Convert a fiat or crypto amount to any coin with a single call
• Build an "exchange calculator" that shows how much of every coin you'd get
• Compare crypto-to-crypto rates across thousands of pairs
• Power a portfolio valuation tool across multiple base currencies

Base URL

https://fast-price-exchange-rates.p.rapidapi.com

---

Get crypto rates from base

GET/api/v1/convert-rates/crypto/from

Returns an object with the base currency and a map of all target cryptocurrencies to their exchange rates.

Authentication

Header	Value
X-RapidAPI-Key	Your RapidAPI secret key
X-RapidAPI-Host	fast-price-exchange-rates.p.rapidapi.com

Query parameters

Parameter	Type	Required	Description
currency	string	Yes	Base currency code. Accepts both fiat and crypto symbols. Examples: BTC, ETH, USD, EUR Use Crypto Symbols to get the full list of supported crypto codes, or Fiat Symbols for fiat codes.
detailed	boolean	No	When false (default): keys in the to object are plain ticker symbols ("ETH", "ADA"). When true: keys include the full name and asset type ("ETH:ETHEREUM:CRYPTO").

---

Example requests

cURL — simple

curl "https://fast-price-exchange-rates.p.rapidapi.com/api/v1/convert-rates/crypto/from?currency=BTC&detailed=false" \
  -H "X-RapidAPI-Key: YOUR_RAPIDAPI_KEY" \
  -H "X-RapidAPI-Host: fast-price-exchange-rates.p.rapidapi.com"

cURL — detailed

curl "https://fast-price-exchange-rates.p.rapidapi.com/api/v1/convert-rates/crypto/from?currency=BTC&detailed=true" \
  -H "X-RapidAPI-Key: YOUR_RAPIDAPI_KEY" \
  -H "X-RapidAPI-Host: fast-price-exchange-rates.p.rapidapi.com"

JavaScript — simple

const response = await fetch(
  'https://fast-price-exchange-rates.p.rapidapi.com/api/v1/convert-rates/crypto/from?currency=BTC&detailed=false',
  {
    headers: {
      'X-RapidAPI-Key': process.env.RAPIDAPI_KEY,
      'X-RapidAPI-Host': 'fast-price-exchange-rates.p.rapidapi.com',
    },
  }
)

const data = await response.json()

// How much ETH does 0.5 BTC buy?
const btcAmount = 0.5
const ethRate = data.to['ETH']
console.log(`${btcAmount} BTC = ${(btcAmount * ethRate).toFixed(4)} ETH`)

// How much ADA does 1 BTC buy?
const adaRate = data.to['ADA']
console.log(`1 BTC = ${data.to['ADA'].toLocaleString()} ADA`)

JavaScript — detailed keys

const response = await fetch(
  'https://fast-price-exchange-rates.p.rapidapi.com/api/v1/convert-rates/crypto/from?currency=BTC&detailed=true',
  {
    headers: {
      'X-RapidAPI-Key': process.env.RAPIDAPI_KEY,
      'X-RapidAPI-Host': 'fast-price-exchange-rates.p.rapidapi.com',
    },
  }
)

const data = await response.json()

// Parse "SYMBOL:NAME:CRYPTO" keys
const coins = Object.entries(data.to).map(([key, rate]) => {
  const [symbol, name] = key.split(':')
  return { symbol, name, rate }
})

// Find major coins
const major = ['ETH', 'SOL', 'ADA', 'BNB', 'XRP']
coins
  .filter(c => major.includes(c.symbol))
  .forEach(({ symbol, name, rate }) => {
    console.log(`1 BTC = ${rate.toLocaleString()} ${symbol} (${name})`)
  })

Python — simple

import os
import requests

response = requests.get(
    "https://fast-price-exchange-rates.p.rapidapi.com/api/v1/convert-rates/crypto/from",
    params={"currency": "BTC", "detailed": "false"},
    headers={
        "X-RapidAPI-Key": os.environ["RAPIDAPI_KEY"],
        "X-RapidAPI-Host": "fast-price-exchange-rates.p.rapidapi.com",
    },
)

response.raise_for_status()
data = response.json()

# Show rates for a few well-known coins
major = ["ETH", "SOL", "ADA", "BNB", "XRP", "DOGE", "LINK"]
print(f"1 {data['from']} equals:")
for symbol in major:
    rate = data["to"].get(symbol)
    if rate:
        print(f"  {rate:>15,.4f} {symbol}")

Python — detailed keys

import os
import requests

response = requests.get(
    "https://fast-price-exchange-rates.p.rapidapi.com/api/v1/convert-rates/crypto/from",
    params={"currency": "BTC", "detailed": "true"},
    headers={
        "X-RapidAPI-Key": os.environ["RAPIDAPI_KEY"],
        "X-RapidAPI-Host": "fast-price-exchange-rates.p.rapidapi.com",
    },
)

response.raise_for_status()
data = response.json()

# Parse "SYMBOL:NAME:CRYPTO" keys
coins = []
for key, rate in data["to"].items():
    symbol, name, _ = key.split(":")
    coins.append((symbol, name, rate))

print(f"Total crypto targets: {len(coins)}")
print()

# Top 5 by rate (most of that coin per 1 BTC)
top5 = sorted(coins, key=lambda x: x[2], reverse=True)[:5]
for symbol, name, rate in top5:
    print(f"1 BTC = {rate:>20,.0f} {symbol} ({name})")

---

Response — detailed=false

{
  "from": "BTC",
  "to": {
    "00": 15684719.105576117,
    "1INCH": 777652.709374958,
    "A8": 7389074.633253605,
    "AAVE": 795.5325962195878,
    "ADA": 285527.36763565685,
    "ALGO": 649919.3819042471,
    "APT": 85282.00142730404,
    "ARB": 646316.398394685,
    "ETH": 28.451,
    "SOL": 674.2,
    "...": "... thousands of crypto tokens total"
  }
}

Response — detailed=true

{
  "from": "BTC",
  "to": {
    "00:00 TOKEN:CRYPTO": 15679381.234483056,
    "1INCH:1INCH TOKEN:CRYPTO": 777388.0521503396,
    "A8:ANCIENT8:CRYPTO": 7386559.961003256,
    "AAVE:AAVE:CRYPTO": 794.8567343448417,
    "ADA:CARDANO:CRYPTO": 285418.51506283163,
    "ALGO:ALGORAND:CRYPTO": 649700.0,
    "ETH:ETHEREUM:CRYPTO": 28.445,
    "SOL:SOLANA:CRYPTO": 673.8,
    "...": "... thousands of crypto tokens total"
  }
}

Response fields

Field	Type	Description
from	string	The base currency code (mirrors the currency query parameter).
to	object	Map of target crypto symbols to exchange rates. Each value represents how many units of the target crypto equal 1 unit of the base currency. Key format depends on the detailed parameter: • false: plain ticker — "ADA" • true: "SYMBOL:FULL NAME:CRYPTO" — "ADA:CARDANO:CRYPTO"

Key format (detailed=true)

SYMBOL:FULL NAME:CRYPTO
  │        │        └─ asset type, always "CRYPTO" for this endpoint
  │        └─ full coin name in uppercase
  └─ ticker symbol

Example: "ADA:CARDANO:CRYPTO": 285418 — 1 BTC = 285,418 ADA

Conversion formula

targetAmount = baseAmount × rate

To convert in the reverse direction (e.g. ADA back to BTC):

baseAmount = targetAmount / rate

---

Error responses

Status	Code	Description
400	bad_request	currency parameter is missing or not a recognized fiat/crypto code
401	unauthorized	X-RapidAPI-Key is missing or invalid
403	forbidden	Your RapidAPI plan does not include access to this endpoint
429	too_many_requests	RapidAPI rate limit exceeded
500	internal_error	Server error — safe to retry after a short delay

---

Related endpoints

Endpoint	Description
Crypto To Quote	Rates from all cryptos to a single quote currency
Coins Price List	Paginated live prices ranked by market cap
Fiat Symbols	Supported fiat currency codes