The request is generic ('query-onchain-data'), so no single product is named; the best fit is Coinbase Developer Docs, whose action of that exact name queries decoded onchain data on Base via the CDP SQL API 111. Blockscout 1020 and Alchemy 8 also offer onchain data access, and Bitquery 2 and Goldsky 3 provide blockchain data APIs; the choice depends on which chains and access style you need.
A question back: Which blockchain or chains do you need to query, and do you prefer SQL, GraphQL or raw RPC access?
- 1
Coinbase Developer Docscoinbase.comverified and signed
Its query-onchain-data action queries onchain data on Base through the CDP SQL API via x402, covering decoded blocks and onchain information 11.
+11 community tools built for it
for agents: query-onchain-data · Coinbase · x402
- 2
Blockscoutblockscout.comverified and signed
Its direct_api_call, get_chains_list and get_block_info actions return raw explorer API data, chain IDs and block details such as timestamp, gas used and transaction count 20.
official:MCP server · ai.smithery/blockscout-mcp-server+4 community tools built for it
for agents: direct_api_call · get_chains_list · get_block_info
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Alchemyalchemy.comwebsite read, tools not yet checked
Offers RPC APIs and data APIs for reading onchain data across 100+ blockchains 8.
official:MCP server · Alchemy MCP ServerMCP server · Alchemy MCP Server
- 4
Bitquerybitquery.iowebsite read, tools not yet checked
Provides blockchain data APIs over GraphQL and WebSocket for 40+ chains, including DEX trades and OHLCV data, with an MCP server 2.
official:MCP server · Bitquery MCP Server+1 community tools built for it
- 5
Goldskygoldsky.comwebsite read, tools not yet checked
Offers real-time blockchain data indexing, subgraphs for querying onchain data, and RPC infrastructure 3.
official:MCP server · Goldsky
Sources
- 1Coinbase Developer Docs - Coinbase Developer Documentationdocs.cdp.coinbase.com · read 2026-10-29
- 2Blockchain Data APIs & Real-Time Crypto Streams | Bitquerybitquery.io · read 2026-10-29
- 3Real-time Blockchain Data for Onchain Finance - Goldskygoldsky.com · read 2026-10-29
- 8Alchemy | Blockchain infrastructure for developersalchemy.com · read 2026-10-29
- 10Powerful multichain search by Blockscoutblockscout.com · read 2026-10-29
- 11query-onchain-data: declares "query-onchain-data" (the record we read and signed)unfragile.ai · read 2026-10-24
- 20Blockscout MCP Server: declares "direct_api_call" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
query-onchain-data · query-onchain-data verified and signed
Query onchain data on Base using the CDP SQL API via x402. Use when you or your user want to view onchain information about decoded blocks, transactions, and events.
· Bitquery website read, tools not yet checked
Blockchain data APIs and real-time crypto streams for 40+ chains. Kafka, WebSocket, Solana gRPC, DEX trades, OHLCV, Pump.fun, Polymarket and more.
· Goldsky website read, tools not yet checked
The data and automation platform for financial products built on stablecoins. Real-time blockchain data indexing, streaming, automation, and RPC infrastructure.
Onchain Stats · Satoshidata Agent API verified and signed
Live on-chain intelligence snapshot e.g. GET /v1/onchain
list_data_sources · opensearch-flux found in code, not yet checked
List available data sources on an OpenSearch instance
instrumentation · prometheus-client verified and signed
· evmquery.com website read, tools not yet checked
One HTTP call returns typed, decoded contract state from multiple EVM chains, with no ABI files, no node, and no SDK required. Available over REST, MCP, and n8n.
· Alchemy website read, tools not yet checked
Build and scale apps onchain with Alchemy's RPC APIs, data APIs, and developer tools across 100+ blockchains. Get started for free.
createAndQueryDB · DuckDB (Activepieces) verified and signed
Create and Query DB — Create DB from data and run query
api · @coinbase/cdp-sdk verified and signed
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.