EigenDA Skill

Store and retrieve data blobs on EigenDA — EigenLayer’s Data Availability layer. EigenDA provides high-throughput, low-cost data availability for rollups and applications.

What is EigenDA?

EigenDA is a data availability (DA) service built on EigenLayer. It lets you:

• Store blobs — submit arbitrary data, get back a cryptographic commitment
• Retrieve blobs — fetch data using the commitment hash
• Verify — KZG commitments prove data integrity

Architecture

Your App → EigenDA Proxy (localhost:3100) → EigenDA Disperser → EigenDA Operators

The EigenDA Proxy is a local REST server that handles encoding, KZG verification, and communication with the EigenDA disperser network.

Prerequisites

Run the EigenDA Proxy locally via Docker:

docker run -d \
  --name eigenda-proxy \
  -p 3100:3100 \
  ghcr.io/layr-labs/eigenda-proxy:latest \
  --eigenda.disperser-rpc=disperser-sepolia.eigenda.xyz:443 \
  --eigenda.service-manager-addr=0xD4A7E1Bd8015057293f0D0A557088c286942e84b \
  --eigenda.eth-rpc=YOUR_SEPOLIA_RPC_URL \
  --eigenda.status-query-timeout=45s \
  --eigenda.signer-private-key-hex=YOUR_PRIVATE_KEY \
  --memstore.enabled=false \
  --eigenda.disable-tls=false

When to use this skill

Use when the user asks about:

• Storing data on EigenDA
• Retrieving data from EigenDA by commitment
• Data availability for rollups
• Blob storage and retrieval
• EigenDA proxy setup
• Verifying data commitments
• EigenDA health/status checks

How to use

Store a blob via proxy

curl -s -X POST "http://127.0.0.1:3100/put?commitment_mode=standard" \
  -H "Content-Type: application/json" \
  -d '{"key": "value", "timestamp": "2025-01-01T00:00:00Z"}'

Returns: a hex commitment string (the blob’s address on EigenDA).

Retrieve a blob via proxy

curl -s "http://127.0.0.1:3100/get/COMMITMENT_HASH?commitment_mode=standard"

Returns: the original JSON data.

Health check

curl -s "http://127.0.0.1:3100/health"

View blob on explorer

After storing, view the blob at:

https://blobs-sepolia.eigenda.xyz/blobs/COMMITMENT_HASH

EigenDA v2 Disperser API (Direct)

For direct access without the proxy (advanced):

Disperse a blob

The v2 disperser uses gRPC at disperser-sepolia.eigenda.xyz:443:

• DisperseBlob() — enqueue a blob for dispersal
• GetBlobStatus() — poll dispersal status
• GetBlobCommitment() — get the KZG commitment

Retrieve from relay

The v2 Relay API provides:

• GetBlob(blob_key) — retrieve blob from relay nodes

Configuration

Commitment modes

• standard — full KZG commitment, highest security
• optimistic — faster but with weaker guarantees

Networks

Programmatic Usage

const EigenDA = require('eigen-skills/skills/eigen-da/scripts/da-api');

const da = new EigenDA({
  proxyUrl: 'http://127.0.0.1:3100',  // default
  commitmentMode: 'standard',          // default
  timeout: 60000,                      // default
});

// Store data
const commitment = await da.store({ key: 'value', timestamp: new Date() });
console.log('Commitment:', commitment);
console.log('Explorer:', da.getExplorerUrl(commitment));

// Retrieve data
const data = await da.retrieve(commitment);
console.log('Retrieved:', data);

// Health check
const healthy = await da.healthCheck();