Which onchain data tools exist for onchain agents?

Skim is a data service for agents on Base.

Free, key-less crypto news and market-data API aggregating Bitcoin, Ethereum, Solana, and DeFi.

Wallet and DeFi data provider offering portfolio, positions, transactions, PnL, and prices across many chains, with an agent-accessible API.

Open DeFi analytics dashboard and free API tracking TVL, fees, revenue, volume, and yields across many chains and protocols.

Onchain analytics platform with wallet labeling and smart-money tracking, offering an API with key-based and x402 access.

Official Machine Payments Protocol catalog of payment-enabled services, with a web directory, JSON API and read-only MCP server.

Trading-intelligence API for Robinhood Chain and Solana (KOL trades, DEX tape, deployer reputation) with MCP, SDKs, ElizaOS plugin and x402 pay-per-call.

US stock market data API (formerly Polygon.io); agents buy it per request over x402 at agent.massive.com with no account.

Multi-chain API tracking 1,600+ labeled KOL, smart-money, and whale wallets, with an MCP server.

MCP server querying Aave V2/V3/V4 lending and governance data across 7 chains via The Graph.

MCP server for Gloria AI's curated crypto news feed — sentiment-tagged headlines, recaps, and search for agents.

Official MCP server from Subsquid (SQD) exposing its Portal API for querying onchain data across five chain families.

x402 Bazaar Rank is a data service for agents on Base, Arbitrum, Polygon.

Official MCP server from certified staking provider Everstake exposing live APY, uptime, and staking-calculator data.

Solana Foundation community registry of stablecoin-gated (USDC/USDT) APIs the pay CLI and AI agents can search, route to, and pay through.

Official MCP server for NFTGo's Ethereum NFT analytics API: collections, assets, market data, and wallet holdings.

Hosted MCP server for on-chain whale tracking and forensics across BTC, ETH, SOL, USDT, and tokenized gold.

Decentralized ML-inference network aggregating community models into price/volatility forecasts agents can query.

Onchain portfolio data provider exposing token, NFT, and DeFi position data across many chains via a GraphQL API.

Community MCP server for querying Solana transactions in natural language via the Solscan API.

MCP wrapper around Cryo, the Rust/Python Ethereum data-extraction tool, for bulk block/trace/log queries plus SQL.

On-chain oracle letting Solana smart contracts request LLM inference and process results via verified callbacks.

An onchain data network providing structured, AI-ready blockchain data across many chains, with API, CLI, MCP, and x402 access.

Pay-per-use MCP gateway aggregating Dune, DefiLlama, Zerion, CoinGecko, and Cielo for agent-facing crypto data.

Onchain intelligence API that attributes wallets to entities; agents can pay per request in USDC over x402.

Onchain market metrics (MVRV, exchange flows, supply distribution) sold per call over x402, no API key.

Decentralized data exchange that lets agents access, publish, and pay for datasets and compute-to-data jobs.

Agent-native blockchain data API: single-purpose REST 'Skills', an MCP server (@one-source/mcp) and an M10 natural-language layer, paid per call via x402 or a $20/mo key.

Pay-per-query access to subgraphs on The Graph Network over x402, paid in USDC on Base with no API key.

Pay-per-article access to 100+ paywalled financial newsletters and podcasts, plus a structured stock-picks feed, over x402 or MCP.

REST API that returns the unclaimed airdrops, rewards and claimables for one wallet address across EVM, Solana and Cosmos.

Pay-per-call MCP for blockchain analytics — gas tracking, whale monitoring, wallet profiling — spanning Base, Bitcoin, and XRP Ledger.

GraphQL API over Galxe quests and campaigns — the task layer most airdrop-eligibility programs are run on — queryable by an agent with a token.

Ogena token risk is a data service for agents on Solana, Base.

Explorer for the x402 ecosystem: transactions, sellers, origins, and resources across agentic commerce.

Ecosystem explorer for the Machine Payments Protocol (MPP) on Tempo: agent payment servers, micropayments, and volume.