OneSource MCP

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# @one-source/mcp Unified MCP server for [OneSource](https://docs.onesource.io) — 31 tools for blockchain data, live chain queries, and API documentation in a single server. Combines [`@one-source/api-mcp`](https://www.npmjs.com/package/@one-source/api-mcp) (22 tools) and [`@one-source/docs-mcp`](https://www.npmjs.com/package/@one-source/docs-mcp) (9 tools) so your AI assistant gets full access to OneSource with one MCP connection. > **What is MCP?** The [Model Context Protocol](https://modelcontextprotocol.io) lets AI assistants call tools and access data sources. This server exposes both the OneSource blockchain API and its documentation as tools. ## Quick Start ### Claude Code ```bash claude mcp add onesource -- npx @one-source/mcp ``` ### Claude Desktop / Cursor Add to your MCP config: ```json { "mcpServers": { "onesource": { "command": "npx", "args": ["-y", "@one-source/mcp"] } } } ``` ### Any MCP Client (stdio) ```bash npx @one-source/mcp ``` ### HTTP Server (self-hosted) ```bash npx @one-source/mcp --http npx @one-source/mcp --http --port=8080 ``` Then connect your MCP client to `http://localhost:3000/`. ## Tools (31) ### Blockchain API — Live Chain (12 tools) | Tool | Description | |------|-------------| | `1s_allowance_live` | ERC20 allowance check | | `1s_contract_info_live` | Contract type detection via ERC165 | | `1s_erc1155_balance_live` | ERC1155 balance via RPC | | `1s_erc20_balance_live` | ERC20 balance via balanceOf | | `1s_erc20_transfers_live` | ERC20 Transfer logs via eth_getLogs | | `1s_erc721_tokens_live` | ERC721 token enumeration | | `1s_events_live` | Event logs via eth_getLogs | | `1s_multi_balance_live` | ETH + multiple ERC20 balances | | `1s_nft_metadata_live` | NFT metadata via tokenURI | | `1s_nft_owner_live` | NFT owner via ownerOf | | `1s_total_supply_live` | Token total supply | | `1s_tx_details_live` | Transaction + receipt via RPC | ### Blockchain API — Chain Utilities (10 tools) | Tool | Description | |------|-------------| | `1s_contract_code` | Contract bytecode | | `1s_ens_resolve` | ENS name/address resolution | | `1s_estimate_gas` | Gas estimation | | `1s_network_info` | Chain ID, block number, gas price | | `1s_nonce` | Transaction count | | `1s_pending_block` | Pending block from mempool | | `1s_proxy_detect` | Proxy contract detection | | `1s_simulate_call` | Simulate eth_call | | `1s_storage_read` | Read storage slot | | `1s_tx_receipt` | Transaction receipt | ### Documentation (9 tools) Read-only, no API key required. | Tool | Purpose | When to use | |------|---------|-------------| | `search_docs` | Keyword search across all documentation | Finding guides, concepts, or API patterns | | `get_query_reference` | Full reference for a root GraphQL query | Building a specific query with correct args/filters | | `get_type_definition` | Schema definition for any type/enum/input | Understanding field shapes and return types | | `list_examples` | Browse or search working GraphQL examples | Finding ready-to-use query patterns | | `list_supported_chains` | All supported blockchain networks + endpoints | First question: "What chains are supported?" | | `get_filter_reference` | Filter fields and operators for a list query | Building filtered queries with correct syntax | | `get_pagination_guide` | Cursor-based pagination pattern with examples | Implementing pagination for list queries | | `get_schema_overview` | High-level summary of the entire schema | Exploring the API surface before diving in | | `get_authentication_guide` | API key format, headers, and endpoints | Setting up authentication for the first time | ## Networks All blockchain API tools accept an optional `network` parameter: | Network | Description | |---------|-------------| | `ethereum` | Ethereum mainnet (default) | | `sepolia` | Ethereum Sepolia testnet | | `avax` | Avalanche C-Chain | ## Payment (x402) Blockchain API endpoints are priced in USDC on Base via [x402](https://github.com/coinbase/x402). When the backend has payments enabled, tool calls return a 402 with payment details. Agents using [`@x402/fetch`](https://www.npmjs.com/package/@x402/fetch) handle this automatically. Documentation tools are always free — no API key or authentication needed. ## License Apache 2.0