Questions tagged [blockfrost]

Anything referencing to Blockfrost API.

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How to loop through multiple pages of blockfrost api in Javascript

I'm trying to count the assets at a blockfrost api endpoint. It only shows 100 items on a page though. How do you loop through all the pages and extract the asset count? Thanks for any help. const ...
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Building a transaction on cardano-cli/api without running node?

Is there a way to build and sign transactions with the cardano-cli/api without running a node? I am trying to construct a transaction using the cli or api and submit it using blockfrost. It throws an ...
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1 answer
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Haskell + Blockfrost toolchain?

I am looking for a Haskell alternative to the cardano-serialization-lib, which can work in conjunction with blockfrost-haskell. So ideally, it should be able to easily create wallet keys, transactions,...
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How can I Convert BlockFrost API Code to Dandelion API?

I have somehow managed to get a lot of code for BlockFrost API, however, I want to build some free applications for people to monitor blockchain data from a website dashboard. To take advantage of the ...
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Is the Transaction Hash from block frost the same as the transaction id?

When making an API (HTTP) Get request to the blockfrost API service, you can specify an address and get the transactions at the address (https://docs.blockfrost.io/#tag/Cardano-Addresses/paths/~...
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How to get NFT count of wallet address

I'm wanting to display the NFT count of a wallet on my website. I've gone through the blockfrost SDK and I don't see anything that relates to NFTs. Is there a method to return this value? Here is my ...
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Can I use Blockfrost to call custom endpoints of my Plutus offchain contract?

Blockcfrost-related question. Can we expose our own custom endpoints in our off-chain Plutus contract, and use your API to send requests from our own frontend client? For example, if I expose an ...
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find text from transaction message with blockfrost or koios

small (maybe) easy question. i want to find with blockfrost a "message" on a transaction. can someone help me a bit for this? i dont find currently anything. thank you in advanced. TTS17
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How to get assets with a specifc policy id from a wallet address using BlockFrost OpenAPI

For context, I'm trying to get all NFTs with a policy id, but only from a wallet address. I'm using BlockFrost OpenAPI, and it seems that I can only get assets with a policy id from the entire ...
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1 answer
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How to interpret complex transaction data on cardano blockchain

for many of you this may seem as a complete noob question, but I am as many new to this world and can need a hand with this question. I am currently looking at some random transactions of some NFTs ...
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find holders from same policy but different asset name

I have a policy ID with hundreds of NFT with different asset name (for eg TTS19, TTS20, etc) what is the easiest way to find all addresses/wallets which have this NFT(holders)? I tried with koios and ...
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Is there a way to set a trigger on Blockfrost to know when an asset has been moved?

With Blockfrost, I can easily query which assets belong to a staking address using /accounts/{stake_address}/addresses/assets. I would like to use this approach to allow users to associate their ...
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how to generate cardano new address using blockfrost.io?

Is it possible to generate new address and private key for cardano using blockfrost.io api, that later on can use for transactions and adding it into wallet. thank you
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I hear that Daedalus Is a Full Node Does That Mean I Can Set Up a DB Sync Server On Top of It?

The Daedalus wallet is said to be a full node wallet. Does that mean I can set up something similar to blockfrost on top of it? If so how?
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Short address crashed blockfrost calls

Using blockfrost I have pulled a list of addresses of owners of a specific fungible token. Some of the addresses are significantly smaller than the others (about 2/3 the length). When querying ...
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What am i doing wrong while creating this staking transaction?

i am trying to create a staking transaction using cardano serialisation library and then use blockfrost/infinito to send the transaction. I am using @emurgo/cardano-serialization-lib-nodejs: ^9.1.4, ...
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Stream/Query transaction price history of an asset

Is it possible to get the transaction incl. price history of an asset e.g. (SundaeSwap) using blockfrost or cardano-db-sync? If yes, is it also possible to stream this value from block to block?
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How to retrieve an addresses transaction history inside a plutus contract

I am trying to implement so logic to ensure smart contract (SC) validation upon certain conditions - which are derived from the end-users transaction history. If I parameterise the SC and take the ...
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Class Transaction/TransactionHash . to_bytes() returns empty Uint8Array(0) [] - Cardano Serialisation lib

I am currently facing this issue: transaction.to_bytes() defined in (blockfrost-js/index.ts at master · blockfrost/blockfrost-js · GitHub) returns an empty array Uint8Array(0) It sometimes returns a ...
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How can I establish the communication between my Flutter App and Cardano Blockchain?

Did anybody succeed with building a Flutter App that can communicate with the Cardano Blockchain? I would be happy if I could get some more guidance. I'm trying to build a cross-platform Dapp, so I do ...
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1 vote
1 answer
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PPViewHashesDontMatch and UnspendableUTxONoDatumHash error on redeeming funds from week03 example

I am trying to redeem the funds from the smart contract into the second wallet without running cardano-node (following the instructions from here: https://www.youtube.com/watch?v=ABtffZPoUqU&list=...
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Received the transaction id but the transaction never happened

I used to work with Blockfrost API to submit my transactions. A few days ago, I ran into this problem in which my transactions were submitted successfully (The API returned me the transaction id ...
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2 answers
174 views

Blockfrost doesn't find address

I'm trying to query address details of a yet unused address via blockfrost. If I enter the Address in cardanoscan.io, it shows me the stake key of the address, well and fine. But on Blockfrost it ...
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upload folder to ipfs using blockfrost

How to upload folder to IPFS using blockfrost. able to upload a file using the following, but not able to upload a folder curl "https://ipfs.blockfrost.io/api/v0/ipfs/add" \ -X POST \ -H ...
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1 answer
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Is secure to Fetch Data from BlockFrost from the Front-End?

I am building a daap, but I must fetch data from Blockfrost in order to make the transaction, I am not sure if should i Add my personal project ID in a request from the front end. Currently i have ...
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2 votes
5 answers
136 views

How to obtain wallet addresses of stake pool delegators?

I am trying to figure out how to write some scripts that will dish out rewards to delegators on my staking pool - I want to get the wallet addresses of delegators, and determine rewards based on the ...
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2 answers
59 views

What is the output from a transaction when burning tokens?

I'm submitting a transaction to burn token to the blockfrost API and receives the following error (ApplyTxError [UtxowFailure (WrappedShelleyEraFailure (UtxoFailure ...
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1 vote
1 answer
73 views

How to connect to Testnet on Blockfrost API with blockfrost-js

I am getting an error connecting to the Blockfrost API with blockfrost-js "Network token mismatch. Are you using token for the correct network? See https://docs.blockfrost.io/#section/Available-...
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1 answer
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What is the difference between "on-chain-metadata" and "metadata" in the Blockfrost Endpoint

I am fetching my assets using the Blockfrost endpoint for a specific asset: https://docs.blockfrost.io/#tag/Cardano-Assets/paths/~1assets~1{asset}/get But there are two metadata entries, one for "...
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1 vote
1 answer
87 views

Get a list of top asset hodlers for a specific asset

I'm using the Blockfrost API to get a list of the top holders of an asset. ie. The people with the highest quantity of this asset in their wallet. I'm using Blockfrost's API, and the specific call I'm ...
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1 answer
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What is supply.locked in the blockfrost API /network endpoint?

I have been working on a data analytics on Cardano using blockfrost. I am fairly familiar with Cardano tokenomics, but I have been wondering about the supply.locked data in the /network endpoint. Here ...
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1 vote
1 answer
57 views

How to interpret asset transactions data for a NFT?

Using the blockfrost API I quired the transaction history of a NFT using the following script: from blockfrost import BlockFrostApi, ApiError, ApiUrls api = BlockFrostApi( project_id='...
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3 votes
2 answers
230 views

Cardano Node + DB Sync + Graph QL vs. Blockfrost API

I've been contemplating the value of essentially running all your own infrastructure by deploying Cardano node, along side DB Sync and exposing it through Cardano GraphQL. I like the idea of building ...
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1 vote
3 answers
121 views

Burn token using blockfrost java sdk?

Does anyone have an example how to burn a NFT using the blockfrost.io java SDK or Javascript SDK? Thanks a lot in advance.
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3 answers
536 views

How to get Policy Script for a specific policy-ID

how can i get the script information for a given policyID. I am mostly interested in the "invalidAfter" Slot number. So far i could not find any option for example by using Blockfrost API. ...
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2 votes
1 answer
61 views

How to create and sign a transaction on a mobile device?

I would like to create a simple mobile application (iOS) that would create and sign a transaction and submit it through an API like Blockfrost to the network. Preferably that transaction would ...
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7 votes
4 answers
1k views

Minting a NFT (collection) with Blockfrost

I see al lot of NFT projects where you can buy 1 or multiple NFT's for a certain price. Like unsigned_algorithms, CardanoTrees etc. I am curious how these projects are created without the use of smart ...
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3 votes
1 answer
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Unable to view images from ipfs.blockfrost.dev

I am unable to view images on ipfs.blockfrost.dev on my Mac. However, I can view them on my iPhone. I have tried Brave, Chrome, and Safari browsers. Here is the error message I get when I click '...
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5 votes
1 answer
243 views

Blockfrost, GrapgQL or any API for cardano help, working with javascript

I am building an MERN stack app cardano dex tool, I want to use Blockfrost. I have installed the SDK in Node.js backend, but there are only very few examples on how to get any kind of data from it. ...
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9 votes
2 answers
645 views

How can I create a serialized transaction that can be submitted to the blockchain without a local full node?

My goal is to send a transaction (e.g. send 1 ADA from addr1A to addr1B) using the following endpoint of the blockfrost.io API: "Submit an already serialized transaction to the network." ...
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2 votes
1 answer
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Blockfrost API and IPFS issues

Right now I have some NFTs to pin on the blockfrost IPFS. That way I don't need to run the node 24h a day. But for some reason the API returns an error when I try to add new assets. I'm using a free ...
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