Questions tagged [external-api]

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34 views

How to pull data from DeFi Liquidity Pools

I am relatively new to decentralised development, and apologies in advance if a bit of a dumb question. I am doing a project where I am looking to download the following data. I am trying to figure ...
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9 views

How I can check request status with provable.xyz?

Simple question but I failed to find the answer. Before Oraclize became provable, there was an api endpoint for checking the status of a specific request id. This for example helped to determine if an ...
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0answers
674 views

Calculating annual percentage yield (apy) value for Uniswap pairs

I wants to calculate annual percentage yield for a token pair listed on uniswap like this. Is there any API which I can use to retrieve the value? How can it be directly calculated?
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28 views

how to get the full list of block reward for the last 24 hours? Either via an API/JSON or Google BigQuery

I have spend a couple of days now trying to find a good source for the block rewards that will allow me to calculate block rewards and averages for the last 24h and since UTC0. (I am aware of being ...
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1answer
495 views

Etherscan api: how to get transaction fee?

For example: open this https://etherscan.io/tx/0xcb1e3530950cf2c43a307bcb5645ae71a12c76a60831617badd04aea3efe68aa It's a random one I see these infos on webpage: Gas Limit: 136,500 Gas Used by ...
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0answers
22 views

scope of references to external smart contract, global variables, eleminiate redundant code

Imagine that there's a smart contract deployed which contains a number of sub-contracts like so: pragma solidity ^0.5.0; contract A { address contract = 0x6663130dDfF21E3BC963Ee902005223b9A202106; ...
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1answer
270 views

Getting stock market data from API or other means?

I'm trying to make a contract that interacts with a market price or a market out come : e.g APPL drops below X or NFLX > Y ... Is it possible in Solidity to call an external API during this ...
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0answers
13 views

Using etherscan to track the status of incomming transactions, free version?

I plan to start to accept Ethereum and some tokens based on it, on a website. The volume would be, I think, at most 10-50 payments a day, at most. And I want to allow a user to know the status of a ...
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1answer
300 views

Are there any public APIs for ENS lookup?

I want to add ENS support to an app I am building, and I am looking for a lightweight API which supports ENS to Ethereum address conversion. All the documentation shows how you can do this on the ...
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2answers
42 views

Etherscan API Get Balance - Decimals Not Showing In Response

Expected Use the Etherscan API to make a GET request for an ETH address' balance in order to receive a response providing the Ether token quantity representing all decimal places. Observed The ...
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2answers
609 views

How to peg value to token outside ethereum

I have an online game system. I issue some tokens through ethereum. How can I peg value of the tokens issued on ethereum to my game system, which is outside the ethereum eco system. (ie) The users ...
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1answer
29 views

Dumping erc20 token transactions via rpc?

I'd like to do dump all transactions of an erc20-token via the json-rpc interface. I've got a full node running but I'm lost, since the ethereum blockchain is harder to navigate than bitcoin for some ...
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2answers
1k views

Block.io ETH alternative

What's a good Ethereum alternative to block.io? By good I mean, trusted and production ready.
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1answer
19 views

Read Solidity smart contract private field

Let's suppose this smartcontract: contract Test1 { string private i_am_private; string public i_am_public; ... } Solidity's compiler is automatically generating a getter function for public ...
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0answers
11 views

Why is serprent considered untrusted?

Serpent was way to fetch Diesel prices from the oraclize api at fixed intervals. On GitHub, it s written audits proved the code to be flawed, but where are such audits? I m meaning why is it flawed?
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60 views

Get all transfers of a token contract from etherscan API with python

I am trying to pull out from etherscan api all token transfer from a particular token contract. Currently, I can pull data by manually going to etherscan token contract page - for ex cvc coin: https://...
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2answers
47 views

any good way to keep listenning the events of erc20 transfer and noticed by a url call

I think I can keep calling by etherscan to find new transactions and I the best way is that I can receive a url callback once an event created on erc20 token event log. Any API I can use for this? Or ...
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1answer
57 views

Why is there 2 methods abi.encode and abi.encodePacked for argument encoding

When we call a function on an external contract, the evm computes a bytes buffer which contains the function signature and arguments. There are 2 ways to serialize arguments: abi.encode and abi....
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34 views

Solidity external call with bytes4 / keccak256

I want to call a Contract1's function from Contract2. I know the way i've tried is deprecated, but i want to understand. This is why i've set a very old solidity version with the pragma directive. I ...
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1answer
32 views

Estimate Solidity function gas cost

When i deploy a smartcontract with remix, i can call functions in order to test it. I do not really know if this is remix or metamask which is doing this job: Before validating the transaction, i have ...
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1answer
445 views

How can I display amount ETH funded and ICO-token received on a webpage

How can I display amount ETH funded and ICO Tokens received on a webpage in a crowdsale ICO campaign? The webpage is the personalised customer page after login. I will display the ethereum adress. ...
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0answers
14 views

try catch syntax in solidity [duplicate]

I have read that "try catch" structure in solidity is dedicated to external calls. Are there other reasons we should work with "try catch" structure ? Here is what i've tried in a ...
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2answers
32 views

remote contract function call with solidity

I've deployed this very simple Contract: contract Contract1 { function myfunction(uint param1) public returns (uint) { return param1+1; } } Now, I've deployed a second contract: ...
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1answer
434 views

Perform an automated transaction using 1inch API

To perform an automated 1 inch transaction I use these two functions. It works well at first. Unfortunately, in the last few days I have always had the same errors: Fail with error 'Return amount is ...
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1answer
150 views

Download Etherscan input data via API

I am unable to find the correct API call format to download the input data field from the event log of each transaction - is there a way to use API key to download this information? I am referring ...
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1answer
16 views

What is “selector” in ChainLink API call?

I am using the example from chainlink to call an API; however, I am not sure it does. function checkProof(string memory JobLocation, int job_id) public { Chainlink.Request memory req = ...
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1answer
53 views

Smart contract access from external source

I would like to build a simple smart contract, which can be accessed from "the outside World", meaning I can call methods of the contract from another small application or web site, instead of having ...
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1answer
16 views

Is it possible to run a program/function written in different language from solidity? [closed]

I have a script written in a different language to get executed and verified by miners of the network. Is there a way to call this script from solidity smart contract?
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1answer
237 views

Call a view function of an Ethereum Smart Contract using a program written in C

my attempt is to call a view function to reatrieve some data from a contract on the Blockchain using a C program. I do have the interface of the contract. I think i need to performe two things in ...
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1answer
15 views

Add param to API POST request [closed]

I need to query this endpoint '''https://******com/api/payments/{payment_id}/refund''' Because it is a post request, I assume that the payment_id param needs to be in the body of the request. How do I ...
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7answers
31k views

How can an Ethereum contract get data from a website?

What is the process/workflow behind the process where an Ethereum contract gets some data from a website?
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1answer
58 views

Chainlink node not connecting to External Adapter

I'm trying to use the Chainlink External Adapter to connect my contract to Twitter but my node I'm running is seemingly not able to connect to the adapter at localhost:8080 even though the adapter ...
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1answer
30 views

How to calculate the right amount of a token to use in 0x quote endpoint

I'm trying to use 0x to buy tokens with ETH. I'm following the sample at https://0x.org/docs/guides/swap-tokens-with-0x-api#swap-eth-for-1-dai. I got the token address, and the decimals. let's say ...
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0answers
26 views

Is first call to oraclize query free in mainnet, as in testnet?

We were trying to include oraclize query to get price feed in one our contracts, as of now we have observed that the first oraclize is free in kovan. Does same applies for mainnet or else we has to ...
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5answers
9k views

REST-Like API for Ethereum

I'm researching REST-Like API services for Ethereum in order to use it on our service. However, there are only a few services I could find. I'd very grateful if you could share the other services. ...
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0answers
32 views

Gettting ERC-20 token transfer count over an API

I am building a service to monitor token activity. Does any service have an API to get the transfer count of a ERC-20 token? I am not interested in individual Transfer events, only their count.
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3answers
14k views

Why can't contracts make API calls?

The model that contracts can only accept and process data, instead of also being able to retrieve data from the Internet, seems limiting (even if not, it's less direct). If a concern is that data or ...
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1answer
172 views

Why do I need decentralized oracles?

I've been reading a lot about how smart contracts work, and I'm a little new to the area, but why do we need decentralized oracles? It feels like I can just make an API call from wherever and it's OK?
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0answers
54 views

How does chainlink solve the oracle problem? [closed]

I've heard a lot about Chainlink recently -- how Synthetix, Aave and other top Defipulse projects are using them. How exactly does Chainlink solve the oracle problem from a technical perspective?
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3answers
768 views

ERP systems and Ethereum

I wanted to know the integration state of ERP system (like SAP) and Ethereum. Is there an API that allow a smart contract to fetch information from a ERP to store that data? Thanks in advance Best!
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7answers
4k views

Is there any websocket ethereum provider?

Is there any websocket ethereum provider? Except etherscan one. Maybe there are paid wss subscriptions?
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0answers
33 views

Free API To Get Ethereum Price [duplicate]

I am looking for a free api to get ETHEREUM CRYPTO CURRENCY PRICE. Entire yesterday i was searching google & test many web sites. But result was zero for ethereum price. Here is what i tried : 1. ...
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1answer
908 views

What is the best free api for ETHEREUM price [closed]

I use the api below for bitcoin price : https://api.coindesk.com/v1/bpi/currentprice.json But coindesk hasn't ETHEREUM price in it's api. What api should i use to get ETHEREUM price? Also the api ...
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1answer
146 views

Which is the best way to interact between smart contracts for complex scenarios (solidity 0.6)?

I'm learning about Solidity. I would like to write a complex scenario of demo to test the power of Solidity and smart contracts. My doubts are about interaction between smart contracts. If there ...
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1answer
818 views

How to make API calls from a .NET Application to an Ethereum Private Network

I'm starting on blockchain development and I have a question: I was wondering if it is possible to make RPC calls to a private ethereum network (handling user private keys is not a problem in our ...
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4answers
20k views

Is there API to create Ether wallet?

I know how to create wallet manually, however I would not like to take my clients out of website (I doubt anyone would) and would rather do their wallet creation behind the scenes when they register ...
2
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1answer
142 views

How can I query an API to get my erc20 token balance of an address in JSON format?

Is there an api where I can query if an address contains an erc20 token? I need it returned in JSON format.
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2answers
403 views

How to post to the blockchain without a third party API like infura

I have been using web3 nodejs and infura.io to build apps that interact w/ the Ethereum Blockchain and it is all great but I don't like the idea of a failure point my my apps because they rely on a ...
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1answer
52 views

DDEX Api Question for Python… Signing ETH Transactions?

Having an issue with signing a message for the DDEX api... I'm trying to do it in python, and for some reason my signature is off by two characters. Here's my code using the private key and UTC ...
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1answer
66 views

Any QuickBlocks tutorial?

From my understanding QuickBlocks is an api in C++ that provides similar services as etherscan API for the ethereum blockchain. Is there a link or tutorial to use quickkblocks because the example in ...