ChangeNOW API

Name: ChangeNOW API
Brand: ChangeNOW API
Availability: InStock

✓ Official Vendor SpecFinanceBankingapiKey8 EndpointsREST

For Agents

Quote and execute non-custodial cryptocurrency swaps across hundreds of trading pairs without requiring user registration. Useful for wallets, bots, and agents that need to convert between digital assets on demand.

Install Jentic One Beta

Connect the ChangeNOW API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the ChangeNOW API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with ChangeNOW API.

List every supported cryptocurrency and fiat with availability flags via /exchange/currencies and /fiat-currencies/fiat

Quote an estimated receive amount for a swap pair before the user commits with /exchange/estimated-amount

Fetch the minimum exchange amount for a specific from/to pair using /exchange/min-amount

GET STARTED

Start building with ChangeNOW API

Explore with Jentic

View OpenAPI Document

Use Cases

Patterns agents use ChangeNOW API for, with concrete tasks.

★ In-Wallet Crypto Swaps

Non-custodial wallets can offer in-app token swaps without holding user funds by integrating the ChangeNOW exchange flow. The wallet quotes a rate via /exchange/estimated-amount, validates limits via /exchange/range, and creates the swap with POST /exchange. Users send funds to the returned deposit address and ChangeNOW handles the conversion and payout to the user's destination wallet.

Quote a swap of 0.05 BTC to ETH, create the exchange with the user's ETH payout address, and return the BTC deposit address to the wallet UI

Portfolio Rebalancing Bots

Trading bots and portfolio managers can rebalance cross-chain holdings by chaining quotes and exchanges through the ChangeNOW API. The bot pulls /exchange/estimated-amount for each leg, validates against /exchange/min-amount and /exchange/range, then submits POST /exchange transactions for assets that need to be reallocated. Status polling via /exchange/by-id confirms completion before the next leg fires.

Quote SOL to USDT and ETH to USDT, create both exchanges if estimates clear thresholds, and poll /exchange/by-id until both finish

Price Comparison and Quote Aggregation

Aggregator sites and Telegram or Discord bots show users the best available rate across exchanges. Pulling /exchange/estimated-amount and /exchange/currencies from ChangeNOW gives a no-KYC quote that can be compared against other venues. The /exchange/market-info/available-pairs endpoint helps the aggregator pre-filter pairs that ChangeNOW actually supports.

Fetch estimated-amount for 1 ETH to USDT from ChangeNOW and surface the rate alongside other quoted venues for the user

Agent-Driven Crypto Conversions via Jentic

An AI agent given an instruction like 'swap 200 dollars worth of LTC to BTC' can resolve the entire flow through Jentic. It searches for the swap operation, pulls a fresh estimate, creates the exchange transaction, and returns the deposit address — all without seeing the API key. Jentic's MAXsystem keeps the ChangeNOW credential isolated.

Search Jentic for 'create a cryptocurrency exchange', estimate LTC to BTC, and create the swap with the user's BTC payout address

Key Endpoints

8 endpoints — changenow is an instant cryptocurrency exchange that lets users swap between hundreds of digital assets without creating an account.

METHOD

PATH

DESCRIPTION

GET

/exchange/currencies

List all supported cryptocurrencies

GET

/exchange/estimated-amount

Quote an estimated receive amount for a swap pair

GET

/exchange/min-amount

Get the minimum send amount for a pair

GET

/exchange/range

Get the supported send-amount range for a pair

POST

/exchange

Create a non-custodial exchange transaction

GET

/exchange/by-id

Look up exchange status and details by ID

GET

/exchange/market-info/available-pairs

List all currently tradable pairs

GET

/exchange/currencies

List all supported cryptocurrencies

GET

/exchange/estimated-amount

Quote an estimated receive amount for a swap pair

GET

/exchange/min-amount

Get the minimum send amount for a pair

GET

/exchange/range

Get the supported send-amount range for a pair

POST

/exchange

Create a non-custodial exchange transaction

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

ChangeNOW uses a static API key in the x-changenow-api-key header. Jentic stores the key encrypted in the MAXsystem vault and the agent only ever sees a scoped, short-lived execution token.

Intent-based discovery

Agents query Jentic with intents like 'swap one cryptocurrency for another' or 'quote a crypto exchange rate', and Jentic returns the matching ChangeNOW operations with their input schemas.

Time to first call

Direct ChangeNOW integration: 1-2 days for auth, quoting, and the exchange create + status flow. Through Jentic: under 30 minutes — search, load, execute.

FAQs

Specific to using ChangeNOW API through Jentic.

What authentication does the ChangeNOW API use?

ChangeNOW uses an API key passed in the x-changenow-api-key header. When called through Jentic, the key is held in the MAXsystem vault and the agent receives a scoped execution token rather than the raw key.

Can I create a swap without registering users on ChangeNOW?

Yes. ChangeNOW is fully non-custodial and does not require user accounts. POST /exchange takes the from/to currencies, send amount, and the user's payout address; ChangeNOW returns a deposit address that the user funds, and the swap completes automatically.

How do I quote an exchange rate before creating a transaction?

Call GET /exchange/estimated-amount with the from/to currencies and the send amount. The response includes the expected receive amount and helps your UI show the user a quote. Always re-validate with /exchange/min-amount and /exchange/range before submission.

What are the rate limits for the ChangeNOW API?

ChangeNOW does not publish a single fixed rate limit; production limits scale with your partner key. Implement backoff on HTTP 429 responses and cache the /exchange/currencies and /exchange/market-info/available-pairs lookups since they change rarely.

How do I track the status of a swap through Jentic?

After creating the exchange, call GET /exchange/by-id with the transaction ID. Through Jentic, search for 'check exchange status', load the schema, and execute. Sign up at https://app.jentic.com/sign-up for an agent API key.

Does ChangeNOW support fiat-to-crypto conversions?

The v2 API exposes a /fiat-currencies/fiat endpoint listing supported fiat options. Fiat purchase flows are handled by ChangeNOW's partner providers; the core /exchange operations remain crypto-to-crypto and require an existing crypto deposit.