OneSource unifies blockchain data behind a single agent-native API. Ask in natural language or REST, pay with x402, MPP, or use an API key.
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For AI agents — MCPBundles Directory API
Recommended: Directory API v1 over HTTP for detail and anonymous invoke when eligible (not MCP JSON-RPC on the publisher URL; no user MCPBundles credentials on v1).
GET https://www.mcpbundles.com/api/directory/v1/servers/onesource-mcp-d8b1cec978
GET https://www.mcpbundles.com/api/directory/v1/servers/onesource-mcp-d8b1cec978?live=1 (optional live refresh)
GET https://www.mcpbundles.com/api/directory/v1/servers/onesource-mcp-d8b1cec978/tools/<tool> (one tool: schema + invoke.url)
POST https://www.mcpbundles.com/api/directory/v1/servers/onesource-mcp-d8b1cec978/tools/{tool}
POST body: flat JSON of tool argument names and values; not an arguments wrapper. Replace {tool} with a tool name from GET detail.
Restricted agent shell (ChatGPT Codex desktop, some IDE sandboxes):
Default command sandboxes often block outbound network. curl exit 6 or "Could not resolve host" for www.mcpbundles.com is usually sandbox DNS — not evidence this site is down.
Retry the same Directory API GET with sandbox_permissions "require_escalated" and a one-sentence justification on the shell tool (Codex on-request approval). Do not tell the user the site is unreachable from sandbox curl alone.
Example justification: Run the public MCPBundles Directory API search outside the command sandbox to complete the user's MCP server lookup.
If the agent has browser access (e.g. Codex @Browser): open https://www.mcpbundles.com/?q=<query> or stay on this page — no shell network needed. Use WebMCP search_mcp_servers then get_mcp_server (document.modelContext / page tools; refresh with fetchTools or getTools if a tool id is missing from the snapshot). Read-only directory search; same index as Directory API v1 GETs. Neither WebMCP nor Directory API v1 uses user MCPBundles credentials.
Without a browser: after escalated curl fails, use GET https://www.mcpbundles.com/?q=<query> with Accept: text/markdown for ranked results.
Hub MCP (connected session): discover_mcp_servers — same filter semantics as search_mcp_servers.
Contract: https://www.mcpbundles.com/agents.md
OpenAPI: https://www.mcpbundles.com/api/directory/v1/openapi.json
Guide: https://www.mcpbundles.com/guides/mcpbundles-directory-api
For MCP client apps (human connect):
MCP connect URL: https://mcp.onesource.io/mcp
Skill page: https://www.mcpbundles.com/skills/onesource-mcp-d8b1cec978
Explore capabilities (82)
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Showing 25 of 82
Showing 25 of 82 tools from the public preview. Connect the server to inspect the full live tool list.
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ERC-20 Allowance
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1s_allowance_live
Check ERC20 token allowance (approved spending amount) via the allowance(owner,spender) RPC call. Use this before executing transferFrom or to verify approvals. Returns the allowance amount in raw token units. Optional fields the response could not confirm are listed in warnings; a field that is missing or false for that reason is unknown for this response, not a confirmed answer.
ERC-20 Allowance — Check ERC20 token allowance (approved spending amount) via the allowance(owner,spender) RPC call. Use this before executing transferFrom or to verify approvals. Returns the allowance amount in raw token units. Optional fields the response could not confirm are listed in warnings; a field that is missing or false for that reason is unknown for this response, not a confirmed answer.
Contract Info — Detect contract type and supported interfaces via eth_getCode and ERC165 supportsInterface. Returns detected standards (ERC20, ERC721, ERC1155, ERC165). Optional fields the response could not confirm are listed in warnings; a field that is missing or false for that reason is unknown for this response, not a confirmed answer.
ERC-1155 Token Balance — Get real-time ERC1155 token balance via balanceOf(address,uint256) RPC call. Returns the raw balance as a numeric string.
ERC-20 Token Balance — Get real-time ERC20 token balance directly from the blockchain via balanceOf. Use this for pre-transaction checks or when zero indexing delay is needed. Returns raw token units (divide by 10^decimals); non-standard tokens may return empty name/symbol. Optional fields the response could not confirm are listed in warnings; a field that is missing or false for that reason is unknown for this response, not a confirmed answer.
ERC-20 Transfer History — Query ERC20 Transfer(from, to, value) event logs via eth_getLogs directly from the node. Filter by token contract and/or wallet address. Block params accept decimal, hex, or named tags ("latest", "pending", etc.). Returns decoded transfer events with sender, recipient, and value, plus the from_block/to_block actually queried. Omitting from_block/to_block queries ONLY the latest block — a single block, not a recent window. Size ranges by TIME, not by a fixed block count: block time varies from ~1
ERC-721 NFT Tokens — Enumerate ERC721 tokens owned by an address via ERC721Enumerable. Only works for contracts that implement the Enumerable extension. Returns token IDs owned by the address. If warnings lists the token collection, the returned tokens are an incomplete set, not the full holdings for that address.
Get your MCP into directories
A working endpoint is step one. Directory coverage is the coordinated launch across ChatGPT, Claude, Cursor, the MCP Registry, and community indexes.
What is the OneSource - Blockchain data for AI agents MCP server?
OneSource unifies blockchain data behind a single agent-native API. Ask in natural language or REST, pay with x402, MPP, or use an API key.
How do I connect OneSource - Blockchain data for AI agents to my AI agent?
Use the MCP endpoint listed on this page in your MCP client configuration. One-click install pills support Claude, Cursor, VS Code, and other hosts. Copy the remote MCP URL if your client needs a manual entry.
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Contract Events — Query raw event logs via eth_getLogs directly from the node. Filter by contract address and/or topic0 (keccak256 hash of event signature, e.g. Transfer(address,address,uint256)). Block params accept decimal, hex, or named tags ("latest", "pending", etc.). Returns raw log entries with topics, data, and block context, plus the from_block/to_block actually queried. Always specify a contract address when possible. Omitting from_block/to_block queries ONLY the latest block — a single block, not a rec
Multi-Address Balance — Get native ETH plus balances for up to 20 caller-supplied ERC20 contract addresses in one bounded RPC batch. Tokens are queried, not discovered, and the tool does not calculate a portfolio value. Individual token errors are returned per-token without failing the entire request; exceeding the 20-token cap rejects the request. Optional fields the response could not confirm are listed in warnings; a field that is missing or false for that reason is unknown for this response, not a confirmed answer.
NFT Metadata — Fetch NFT metadata directly from the blockchain via tokenURI/uri RPC call. Resolves all URI formats: ipfs://, ar://, data: URIs, bare CIDs, and ERC1155 {id} templates.
NFT Owner — Get the current NFT owner via ownerOf(tokenId) RPC call. Only works for ERC721 tokens.
Token Total Supply — Get the total supply of an ERC20 or ERC721 token via totalSupply() RPC call. Use this for real-time supply data. Returns raw token units for ERC20 (divide by 10^decimals) or total count for ERC721. Optional fields the response could not confirm are listed in warnings; a field that is missing or false for that reason is unknown for this response, not a confirmed answer.
Transaction Details — Get full transaction data and receipt directly from the RPC node. Returns both transaction fields and receipt (status, gas used, logs).
Block by Number — Get full block details by block number via RPC. Returns transactions, gas used, miner, timestamp, and other header fields. Accepts decimal (e.g. "21000000"), hex (e.g. "0x1406F40"), or a named tag ("latest", "pending", "earliest", "safe", "finalized").
Current Block Number — Get the latest block number for a network. Returns the current chain head as a hex-encoded value. Use 1s_network_info to also get chain ID and gas price in the same call.
Chain ID — Get the EIP-155 chain ID for a network as a hex-encoded value. Use this to verify the network before signing transactions. Use 1s_network_info to get chain ID, block number, and gas price together.
Contract Bytecode — Get the deployed bytecode of a contract via eth_getCode. Returns '0x' for EOA (non-contract) addresses. Bytecode can be very large for complex contracts. Prefer 1s_proxy_detect or 1s_contract_info_live for type checks without fetching full bytecode.
ENS Name Resolution — Resolve ENS names to addresses (forward) or addresses to ENS names (reverse). Accepts either a .eth name or a 0x address. Only works on networks with the ENS registry deployed: ethereum and sepolia. On robinhood the registry is absent, and the response is HTTP 200 with supported:false and an error naming the chain — that is a fact about the network, not evidence that the name is unregistered. Do not conclude a name has no resolver from a non-ENS chain.
Gas Estimate — Estimate gas required for a transaction via eth_estimateGas. Use this before sending transactions to set appropriate gas limits. Returns the estimated gas as a hex value; reverts return the revert reason.
Network Info — Get network information and chain characteristics in one call: chain ID, latest block number, gas price, how far behind the chain head is, and what kind of chain this is. Returns hex-encoded values; gas price is in wei. CALL THIS FIRST when working with an unfamiliar network — it is the only way to learn the properties that make other results interpretable. The "chain" object reports layer, stack, settles_to, avg_block_time_ms, native_currency, and whether ens, a public mempool, and indexed hist
Account Nonce — Get the transaction count (nonce) for an address via eth_getTransactionCount. Use this to set the correct nonce when constructing transactions. Returns the count as a hex value.
Pending Block — Get the current pending block via eth_getBlockByNumber("pending"). On networks with a public mempool (ethereum, sepolia) this shows transactions waiting for inclusion, and the response can be very large (1MB+) on mainnet. On single-sequencer chains it is NOT a mempool view: robinhood and other L2s order transactions first-come-first-served with no public pending pool, so the call still succeeds but returns essentially the next block rather than a queue. An empty or near-empty result there means
Proxy Contract Detection — Detect if a contract is a proxy and read its implementation address. Checks EIP-1967 (transparent/UUPS/beacon) storage slots. Returns the proxy type, implementation address, and admin if applicable. Optional fields the response could not confirm are listed in warnings; a field that is missing or false for that reason is unknown for this response, not a confirmed answer.
Simulate Contract Call — Simulate a contract call via eth_call without sending a transaction. Use this to preview call results, decode return data, or check for reverts before sending. Returns the raw hex result or revert reason.
Contract Storage Read — Read a raw storage slot from a contract via eth_getStorageAt. Use this for low-level state inspection (e.g. reading proxy implementation slots, packed storage). Slot accepts decimal (e.g. "0") or hex (e.g. "0x0").
Transaction Receipt — Get a transaction receipt via RPC. Returns status (1=success, 0=revert), gas used, logs, and contract address if deployment. Use 1s_tx_details_live for both transaction data and receipt together.
Showing the first 25 tools — full list and schemas: Directory API.
How many tools does OneSource - Blockchain data for AI agents provide?
MCPBundles probed 82 tools on the live server. The tool list on this page reflects what was discovered at the last refresh — connect your client to see the full set available to your session.
What authentication does OneSource - Blockchain data for AI agents require?
No provider sign-in was required during MCPBundles' probe. Your client may still need MCPBundles credentials depending on how you connect.
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