Skill 11 oracle data feeds

Skill vaquarkhan/web3-agent-skills/skills/skill-11-oracle-data-feeds

Production-grade Agent Skills for Web3 AI agents: 15 workflows, 6 MCP servers, DeFi/NFT/compliance guardrails, and VS Code/JetBrains installers.

Install

npx -y skills add vaquarkhan/web3-agent-skills --skill 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.

SKILL.md

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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

Subscribe or direct funding
Request randomness: requestRandomWords(keyHash, subId, minConfirmations, callbackGasLimit, numWords)
Fulfill in callback: fulfillRandomWords(requestId, randomWords)
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

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