Yousend
Integration was seamless, and the fact that it's open-source adds flexibility. On top of that, Blnk is incredibly fast, making it a solid choice for high-performance financial systems.
Toni Akinmolayan
Senior Software Engineer
Read story
Immutable, open-source ledger for developers who move money • • •
Blnk helps developers confidently ship their financial products without compromising accuracy or compliance.
You're halfway done with Blnk. Let Blnk handle the complex ledger and accounting infrastructure under the hood, so your team can stay focused on shipping your product.
PLAY
Trusted by teams from several companies
Developer-first
Build with tools you already use
Blnk is API-first, with SDKs that let you integrate quickly in the languages you already use.
Explore documentation
Language-agnostic
You can use Blnk with any programming language, framework or stack.
Seamless integration
Plug Blnk into your existing apps and systems without rebuilding your core logic.
Great developer experience
Get started in 5 minutes with our comprehensive docs or get answers from our Discord community.
cURL
Node.js
Go
Python
PHP
Java
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curl -X POST http://localhost:5001/transactions \
-H 'Content-Type: application/json' \
-d '{
"amount": 1230.12,
"precision": 100,
"currency": "USD",
"source": "@FundingPool",
"destination": "@Frederick-Bates",
"reference": "ref_funding_001",
"description": "Wallet funding"
}'
-H 'Content-Type: application/json' \
-d '{
"amount": 1230.12,
"precision": 100,
"currency": "USD",
"source": "@FundingPool",
"destination": "@Frederick-Bates",
"reference": "ref_funding_001",
"description": "Wallet funding"
}'
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async function createTransaction() {
const tx = await blnk.transactions.create({
amount: 1230.12,
precision: 100,
currency: "USD",
source: "@FundingPool",
destination: "@Frederick-Bates",
reference: "ref_funding_001",
description: "Wallet funding"
});
}
const tx = await blnk.transactions.create({
amount: 1230.12,
precision: 100,
currency: "USD",
source: "@FundingPool",
destination: "@Frederick-Bates",
reference: "ref_funding_001",
description: "Wallet funding"
});
}
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func main() {
client := blnk.NewClient("http://localhost:5001")
client.Transactions.Create(context.TODO(), blnk.Transaction{
Amount: 1230.12,
Precision: 100,
Currency: "USD",
Source: "@FundingPool",
Destination: "@Frederick-Bates",
Reference: "ref_funding_001",
Description: "Wallet funding",
})
}
client := blnk.NewClient("http://localhost:5001")
client.Transactions.Create(context.TODO(), blnk.Transaction{
Amount: 1230.12,
Precision: 100,
Currency: "USD",
Source: "@FundingPool",
Destination: "@Frederick-Bates",
Reference: "ref_funding_001",
Description: "Wallet funding",
})
}
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import requests
requests.post("http://localhost:5001/transactions", json={
"amount":1230.12,
"precision":100,
"currency":"USD",
"source":"@FundingPool",
"destination":"@Frederick-Bates",
"reference":"ref_funding_001",
"description":"Wallet funding"
})
requests.post("http://localhost:5001/transactions", json={
"amount":1230.12,
"precision":100,
"currency":"USD",
"source":"@FundingPool",
"destination":"@Frederick-Bates",
"reference":"ref_funding_001",
"description":"Wallet funding"
})
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$ch = curl_init("http://localhost:5001/transactions");
curl_setopt_array($ch, [
CURLOPT_POST => true,
CURLOPT_HTTPHEADER => ["Content-Type: application/json"],
CURLOPT_POSTFIELDS => json_encode([
"amount" => 1230.12,
"precision" => 100,
"currency" => "USD",
"source" => "@FundingPool",
"destination" => "@Frederick-Bates",
"reference" => "ref_funding_001",
"description" => "Wallet funding"
]),
]);
curl_exec($ch);
curl_setopt_array($ch, [
CURLOPT_POST => true,
CURLOPT_HTTPHEADER => ["Content-Type: application/json"],
CURLOPT_POSTFIELDS => json_encode([
"amount" => 1230.12,
"precision" => 100,
"currency" => "USD",
"source" => "@FundingPool",
"destination" => "@Frederick-Bates",
"reference" => "ref_funding_001",
"description" => "Wallet funding"
]),
]);
curl_exec($ch);
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HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("http://localhost:5001/transactions"))
.header("Content-Type","application/json")
.POST(HttpRequest.BodyPublishers.ofString("""
{ "amount":1230.12,
"precision":100,
"currency":"USD",
"source":"@FundingPool",
"destination":"@Frederick-Bates",
"reference":"ref_funding_001",
"description":"Wallet funding"
}
"""))
.build();
HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.discarding());
.uri(URI.create("http://localhost:5001/transactions"))
.header("Content-Type","application/json")
.POST(HttpRequest.BodyPublishers.ofString("""
{ "amount":1230.12,
"precision":100,
"currency":"USD",
"source":"@FundingPool",
"destination":"@Frederick-Bates",
"reference":"ref_funding_001",
"description":"Wallet funding"
}
"""))
.build();
HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandlers.discarding());
HTTP 200 OK
{
"id": "txn_6164573b-6cc8-45a4-ad2e-7b4ba6a60f7d",
"status": "APPLIED",
"created_at": "2025-10-12T01:36:46.997063436Z",
"amount": 1230.12,
"precision": 100,
"precise_amount": 123012,
"currency": "USD",
"source": "@FundingPool",
"destination": "@Frederick-Bates",
"reference": "ref_funding_001",
"description": "Wallet funding"
}
"id": "txn_6164573b-6cc8-45a4-ad2e-7b4ba6a60f7d",
"status": "APPLIED",
"created_at": "2025-10-12T01:36:46.997063436Z",
"amount": 1230.12,
"precision": 100,
"precise_amount": 123012,
"currency": "USD",
"source": "@FundingPool",
"destination": "@Frederick-Bates",
"reference": "ref_funding_001",
"description": "Wallet funding"
}
01
BALANCE MANAGEMENT
02
CUSTOMER story
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TRANSACTION WORKFLOWS
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BUILT-IN RECONCILIATION
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CUSTOMER STORY
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IDENTITY MANAGEMENT
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SEAMLESS INTEGRATION
Multi-currency support
out-of-the-box
out-of-the-box
Track fiat, crypto or custom currencies side by side without losing a cent.
Balance monitoring
Define thresholds and get alerted when balances cross set limits.
Organize your balances into ledgers
Group balances into ledgers for cleaner structure, reporting, and reconciliation.
Balance snapshots
Capture point-in-time states of balances for reporting, audits, or analytics.
Historical balances
Retrieve balances at a particular historical point in time in your ledger.
Track transactions through their entire lifecycle
See every state change, from applied, rejected, inflight, or void.
Record your transactions to the smallest cent
Capture every money movement with precision, down to fractions of a unit.
Apply overdrafts to transactions
Allow balances to go negative safely, with clear overdraft limits.
Inflight transactions
Hold transactions and commit only after other events clear or decline.
Backdated transactions
Insert transactions into the past to correct balances without breaking accuracy.
Bulk transactions
Handle large batches of transactions in one go, with the option to enforce all-or-nothing commits.
Set matching rules
Define how records should be matched — by currency, amounts, dates, reference, or description.
Reconciliation strategies
Choose a strategy that fits your operational workflow — one to one, one to many, or many to one.
Batch reconciliation
Process large sets of external records (bank statements, provider records, etc.) at once and match them against your ledger.
Instant reconciliation
Automatically reconcile transactions as they occur.
Manage individuals & organizations
Create and manage user or business profiles.
Link to balances
Connect identities directly to balances and transactions for a complete financial picture.
PII tokenization
Protect sensitive data by tokenizing personally identifiable information (PII) in your ledger.
… and more
Seamless integration with your systems
Search API
Retrieve ledgers, balances, transactions, and identities in your Core for your application.
Hooks
Register and manage webhooks for transactions in your ledger.
Flexible metadata handling
Add or update metadata on any record and make it instantly searchable.
Contributors
Built for developers by developers.
Here's the idea. If you build features that send, receive or hold value: money, assets, stocks, tokens, etc. — Blnk's got you covered.
Join us on Discord
@jerry-enebeli
@antgspakr
@codehakase
@brenmat
@rafaelcarvalho
caetano
caetano
@RyanCarlisle
@RABit85
@artempanko
@asureshotfantasy
@Raene
@anhbaysgalan1
@toniastro
@TechticalRAM
@unix4lyf
Ready to build?
Your financial product starts here
No calls. No long back-and-forths. Choose the setup that fits you best and start right away. Still want a conversation?
Self-host Blnk Core
Self-host your ledger for free in minutes
Pull the Github repo, spin it up and start building with your new ledger.
Costs
$0 forever
Download Blnk Core
Blnk Deploy
… or deploy a managed ledger on our Cloud
Skip the hassle of self-hosting. Instantly deploy a production-ready Core instance on our Cloud, get your credentials, and start building in minutes.
Sign up to Blnk Cloud
Frequently
asked questions
asked questions
Have other questions, send us an email at support@blnkfinance.com
Is Core really free to use?
Yes. Core is open-source under the Apache 2.0 license. You can download, use, inspect, and extend it without any license fees or hidden commitments.
Can Core handle multiple currencies?
Yes. Core is built with multi-currency support. You can maintain balances, perform conversions, and reconcile across different currencies.
Can I connect Core to other systems?
Yes. Core exposes APIs and supports webhooks, making it easy to integrate with payment processors, banking systems, or your custom back-office workflows.
How do I get started with Core?
You can install Core by following the quickstart guide in the docs. Read here.
Do you offer integration support for Core?
Yes, we provide Pro Support for teams that want guided help. With Pro Support, our team assists with ledger design, integration questions, and troubleshooting as you set up and scale Core in production. Reach out to get started.
I have more questions. How do I get answers?
Send us a message at hello@blnkfinance.com or reach out to the team here.
