# API3

**Canonical:** https://apis.io/providers/api3/  
**Website:** https://api3.org/  
**APIs profiled:** 6

API3 is a first-party blockchain oracle network that connects real-world APIs directly to smart contracts without intermediary nodes. Its core technology is Airnode, a serverless oracle node that API providers operate themselves, cryptographically signing data before serving it on-chain. The API3 Market enables dApp developers to subscribe to managed decentralized APIs (dAPIs) — aggregated, multi-source data feeds covering 150+ price pairs across 40+ EVM chains — without speaking to a sales rep or signing a contract. API3's OEV (Oracle Extractable Value) mechanism captures MEV that traditionally leaks to bots around oracle updates and redistributes 80% of that revenue to the dApps reading the feeds, creating a net-positive oracle revenue model. The DAO governs the network via staked API3 tokens.

## Kin Score — 41.6 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 41.6).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 64.6 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 28.6 |
| Commercial Clarity | 39.5 |
| Access Clarity | 39.5 |

## Agent readiness — 35.0 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Paid · Self-serve signup — onboarding: self-serve, pricing: paid, trial: no (confidence: high).

## APIs (6)

- **API3 dAPI Data Feeds** — Managed decentralized API (dAPI) data feeds sourced directly from first-party oracle nodes operated by the data providers themselves. Each feed aggregates signed data from multi...
- **API3 OEV Rewards** — Oracle Extractable Value (OEV) Rewards is API3's revenue-sharing mechanism for dApps that integrate OEV-enabled Api3ReaderProxyV1 proxy contracts. When liquidation or arbitrage ...
- **API3 Airnode HTTP Gateway** — The Airnode HTTP gateway exposes a REST endpoint that allows authorized callers to query an Airnode operator's API data off-chain without sending a blockchain transaction. API p...
- **API3 Airnodes API** — Airnode address discovery
- **API3 Signed Data API** — Reading and writing cryptographically signed oracle data
- **API3 Status API** — Health and deployment information

## Agentic access (1)

- **Api3 Agentic Access** — 4 operations · 1 acting

## Security (2)

- **Api3 Authentication** — http · 1 scheme
- **Api3 Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Plans (1)

- **Api3 Plans**

## Tags

Blockchain, Oracle, Decentralized, Data Feeds, Price Feeds, Web3, DeFi, Smart Contracts, OEV, dAPI

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/api3/). Scores are computed from the provider's own public artifacts under a published rubric.