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Questions tagged [data-feeds]

The tag has no usage guidance.

3
votes
1answer
37 views

How is The Graph a decentralised solution?

I understand that querying for data on Ethereum is a pain in the neck and that The Graph indexes events so that developers can more easily get their most precious blockchain data. However, I'm not ...
0
votes
1answer
357 views

Fetch data from blockchain public network

I have gone through the docs of ethereum and truffle as well. I had created a contract for more understanding related to contracts and its compilation and deployment on local network. But I have ...
5
votes
2answers
735 views

Is there an API which allows to download source code of contracts?

I am doing research into the security of smart contracts and was hoping to gather a dataset containing smart contract source codes. I was wondering if there is an API which allows this. At etherscan ...
1
vote
2answers
962 views

How to take a snapshot of addresses and balances of all normal addresses?

How would one take an addresses and balances "snapshot" of all 6,086,374 normal addresses at block number 4293752?
1
vote
1answer
279 views

Does an API standard for price feeds exist?

The ERC 20 defines a standard interface for designing a token contract. Does a similar standard exist for defining feeds that can be called by other contracts?
2
votes
1answer
440 views

How does automatic selling and buying with the constantly flowing price work?

From the docs: AUTOMATIC SELLING AND BUYING So far, you've relied on utility and trust to value your token. But if you want you can make the token's value be backed by ether (or other ...
1
vote
0answers
70 views

Optional Data Feed on the EVM, what does it mean?

I am trying to understand the idea of optional data feed for EVM in the accounting field especially. I usually read that you can use two fields with the first field being a domain to register and the ...
6
votes
3answers
713 views

Is there a euro-ether data-feed to use in smart contracts

I'd like to implement a reliable data feed in a solidity based crowdfunding contract. the goal is to collect a certain amount of ether that equals an euro amount at the end of the funding. Is there a ...
0
votes
1answer
763 views

How to connect a database to a contract/dapp?

I'm working on making a contract that will issue a user a token. The user will perform an action and this will be stored in our database. Once it's stored in our database, there should be a link ...
2
votes
0answers
222 views

what types of graph data are produced by the ethereum network? [closed]

I'm curious, what sort of node-link graph data is produced by the Ethereum network? I imagine there there is a graph of all transactions, and a higher level graph of miners and the blocks they mined. ...
8
votes
2answers
1k views

Contracts as data feed?

The documentation example for a complex bet contract includes a "Weather feed" service. How would such a feed/service/contract work? For a weather feed, either there needs to be a temperature sensor ...