skill-11-oracle-data-feeds

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Integrates oracle and data feed services including Chainlink and Pyth price feeds, VRF randomness, and Chainlink Automation keepers. Use when consuming on-chain price data, random numbers, or conditional automation.

vaquarkhan By vaquarkhan schedule Updated 6/14/2026
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name: skill-11-oracle-data-feeds description: Integrates oracle and data feed services including Chainlink and Pyth price feeds, VRF randomness, and Chainlink Automation keepers. Use when consuming on-chain price data, random numbers, or conditional automation. metadata: phase: 4 chains: ethereum,polygon,arbitrum,base,optimism,avalanche,bnb

Oracle & Data Feeds

When to Use

  • Reading price feeds for DeFi calculations
  • Requesting verifiable random numbers (VRF)
  • Setting up Chainlink Automation (keepers)
  • Validating oracle freshness and deviation thresholds
  • Comparing multi-oracle prices for manipulation detection

Prerequisites

  • MCP: price-feed-server, blockchain-rpc-server
  • Skill-08 for oracle manipulation risk assessment

Workflow

1. Chainlink Price Feeds

AggregatorV3Interface feed = AggregatorV3Interface(aggregatorAddress);
(, int256 price, , uint256 updatedAt, ) = feed.latestRoundData();

Validation checks:

  • updatedAt within heartbeat (varies: 1h ETH/USD, 24h long-tail)
  • price > 0
  • Compare with Pyth/CoinGecko — flag if deviation > 2%

Feed addresses: see knowledge-base/protocols/ and Chainlink docs per chain.

2. Pyth Network

  • Pull model: update price feeds in same tx via getUpdateData()
  • Hermes API for off-chain price reads
  • Lower latency than push oracles for L2s

3. Chainlink VRF v2.5

  1. Subscribe or direct funding
  2. Request randomness: requestRandomWords(keyHash, subId, minConfirmations, callbackGasLimit, numWords)
  3. Fulfill in callback: fulfillRandomWords(requestId, randomWords)
  4. Never use block variables (blockhash, timestamp) for randomness

4. Chainlink Automation

Type Use Case
Time-based Periodic harvest, rebalance
Custom logic checkUpkeep() returns upkeepNeeded
Log trigger React to specific events

Register upkeep with LINK funding; monitor balance.

5. Oracle Security

  • Use multiple sources for critical decisions (liquidations, minting)
  • Implement staleness checks and circuit breakers
  • TWAP for AMM-derived prices (minimum 30-minute window)
  • Never use spot DEX price as sole oracle for high-value ops

References

  • references/chainlink-feeds.md
  • references/pyth-integration.md
  • price-feed-server MCP tools
Install via CLI
npx skills add https://github.com/vaquarkhan/web3-agent-skills --skill skill-11-oracle-data-feeds
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