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Chainlink

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The industry-standard oracle platform powering the majority of DeFi and bringing capital markets onchain.

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Best for
Live numeric data — crypto prices, FX, stocks, commodities
Token
LINK Paid to node operators for every data update
Value enabled
$31T+ in transactions enabled
as of Jun 2026 · source
Used by
Polymarket Predict.fun Limitless Opinion

How it works

1
Independent nodes fetch data
A Decentralized Oracle Network (DON) of independent node operators each query multiple exchanges / data providers off-chain.
2
Aggregate + sign
Each node submits a signed report; the DON aggregates them (median) into a single authoritative value with no single point of failure.
3
Deliver on-chain
Push feeds update on heartbeat or threshold; Data Streams lets contracts pull the latest signed price on demand in ~1 second.

Why prediction markets use it

  • The most widely-deployed oracle in DeFi, with $31T+ cumulative transaction value enabled and integrations from Swift, JPM, DTCC, UBS, Aave, GMX and Lido.
  • Broadest product surface: price feeds, CCIP cross-chain, VRF randomness, Automation, Proof of Reserve — one oracle covers many needs.
  • For prediction markets, Data Streams gives ~1s latency for sub-15-minute crypto markets — fast enough for high-frequency venues.

Used by

Polymarket
Decentralized prediction market on Polygon — USDC-settled, UMA/Chainlink/Pyth-resolved, ICE-partnered.
Predict.fun
Prediction market on BNB Chain, integrated directly inside the Binance app.
Limitless
Short-duration prediction markets on Base. CLOB + AMM hybrid, Pyth + Chainlink-resolved.
Opinion
BNB-Chain prediction market with a proprietary AI resolver.

History

  1. 2017 Founded by Sergey Nazarov and Steve Ellis (SmartContract Inc); LINK token ICO.
  2. 2019 Mainnet launch — first decentralized price feeds.
  3. 2021 VRF launches; ecosystem expands to multiple L1s.
  4. 2023 CCIP launches — Chainlink's cross-chain interoperability standard.
  5. 2024 Data Streams (low-latency pull mode) launches for high-frequency DeFi venues.
  6. 2025 Major TradFi adoption: Swift, DTCC, J.P. Morgan, Mastercard integrations announced.
  7. 2025-09 Polymarket integrates Chainlink Data Streams + Automation for sub-15-min crypto markets.
  8. 2026-06 Limitless adds Chainlink Data Streams alongside its existing Pyth integration for short-duration crypto (~19k markets/week on Base).

Chains supported

Ethereum Polygon Base Arbitrum Optimism Avalanche BNB Chain Solana Sui Aptos

About

Chainlink is the most widely deployed decentralized oracle network. A distributed set of node operators reads off-chain data (prices, market metadata, sports outcomes, randomness) and pushes signed updates on-chain, where smart contracts consume them. Beyond classic price feeds, Chainlink offers CCIP (cross-chain messaging), Data Streams (pull-based low-latency feeds), VRF (verifiable randomness), Automation and Proof of Reserve. Chainlink reports $31T+ cumulative transaction value enabled (chain.link hero, June 2026) and lists Swift, Euroclear, Mastercard, Fidelity International, UBS, ANZ, J.P. Morgan, DTCC, Aave, GMX and Lido among its partners. In prediction markets Chainlink became a major price-feed oracle through 2025–2026: Polymarket integrated Data Streams + Automation for sub-15-minute crypto markets (Sept 2025), Predict.fun adopted it for its 15-min BTC markets, Limitless added Chainlink Data Streams alongside Pyth in June 2026 (~19k markets/week on Base), and Opinion uses Chainlink as a secondary feed for objective data.

Primary source
Chainlink — Official site + docs.chain.link · verified 2026-06-20