@attestate/crawler

A JavaScript library for retrieving on-chain storage and generating data derivatives.

  • Modular: Extract, Transform and Load stage separation makes composing simple components into complex workflows possible. Stages are reunnable to recover errors.

  • Embedded: Unlike Graph Protocol, Attestate’s Crawler does not have a separate server process. It writes directly to LMDB, an embedded database that can be read-from thread-safely at any time.

  • Batteries-included: Support for Ethereum, IPFS, Arweave, GraphQL and rate-limit pooling for Infura and Alchemy.

Attestate’s Crawler is created to build a web3 of peer to peer applications.

Comparison

Compare Attestate’s crawler with the Graph Protocol using the table below.

Trait

Attestate Crawler

Graph Protocol

Embeddable

✓ (Run as your app)

✘ (Runs as a network)

Output Formats

CSV, JSON, LMDB

GraphQL

Web2 support

HTTP, JSON-RPC, GraphQL

Partial

Free

✓

✘ (tokens required)

Complexity

A few JS files

Big code base

Censorship-resistant

✓

Partially

Customizable

✓ (Compose & implement custom strategies)

✓ (Query many subgraphs)

License

GPL-3

Apache 2.0/MIT

Replicate data

✓

✓

Derive data

✓

Multi-graph app

For a more in-depth discussion of uses cases, visit the use cases site.

Features

  • Rerunnable crawls using Extract, Transform and Load stage separation

  • Fast: GB/s extraction from Ethereum (co-located Erigon)

  • Thread-safe reads with LMDB

  • Rate-limiting support for Infura & Alchemy

  • Efficient: Minimized network calls through separation of concerns

  • No token launch, no miners, no fees: Just a community FOSS GPL3 project

  • Support for Ethereum JSON-RPC, GraphQL, IPFS, Arweave

  • Production-ready & unit-tested

Warning

We’re currently actively working on these documents. They’re still far from complete!

Strategies

Table of Contents

Concepts

Basics