Marketplace Services API3

API3

Oracle service for bringing external data into smart contracts. Use it when raw blockchain activity needs a usable product surface.

Type

Service Data & automation

Protocols

Ethereum

BNB Smart Chain

Polygon

Arbitrum

Base

Optimism

Avalanche

Blast

zkSync Era

Scroll

Sonic

Fantom

Gnosis Chain

Celo

Metis

Mantle

Linea

Oracle service for bringing external data into smart contracts. Use API3 where the product has to query onchain data, consume external inputs, or trigger actions.

Use it for:

Use price and market data onchain.
Trigger contract logic with external signals.
Support DeFi and risk workflows.
Reduce custom oracle infrastructure.

Best fit:

Applications that need blockchain data, oracle inputs, or reliable automated actions.

Documentation

Services related to API3

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