{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"awesome-nebula-block-data-nebulablock-mcp-server","slug":"nebula-block-data-nebulablock-mcp-server","name":"Nebula-Block-Data/nebulablock-mcp-server","type":"mcp","url":"https://github.com/Nebula-Block-Data/nebulablock-mcp-server","page_url":"https://unfragile.ai/nebula-block-data-nebulablock-mcp-server","categories":["mcp-servers"],"tags":[],"pricing":{"model":"open_source","free":true,"starting_price":null},"status":"active","verified":false},"capabilities":[{"id":"awesome-nebula-block-data-nebulablock-mcp-server__cap_0","uri":"capability://tool.use.integration.blockchain.data.query.via.mcp.tools","name":"blockchain-data-query-via-mcp-tools","description":"Exposes NebulaBlock's blockchain data APIs as standardized MCP tools that Claude and other LLM clients can invoke directly. Uses fastmcp library to wrap REST/GraphQL endpoints into a tool registry with schema-based function calling, enabling LLMs to query on-chain data (transactions, balances, smart contracts) without direct API knowledge or credential management.","intents":["I want Claude to query blockchain data and incorporate it into analysis without me managing API calls","I need to build an LLM agent that can autonomously fetch on-chain metrics and make decisions","I want to expose blockchain APIs to Claude through a standardized interface without custom integration code"],"best_for":["AI engineers building blockchain-aware LLM agents","Teams integrating NebulaBlock data into Claude-powered applications","Developers prototyping on-chain data analysis tools with LLM reasoning"],"limitations":["Dependent on NebulaBlock API availability and rate limits — no local caching or fallback mechanisms","MCP tool invocation adds latency for each blockchain query (network round-trip + API processing)","Limited to NebulaBlock's data schema — cannot query arbitrary blockchain sources without additional adapters","No built-in pagination abstraction — large result sets may require multiple tool calls or truncation"],"requires":["NebulaBlock API credentials (API key or authentication token)","fastmcp library installed and configured","MCP-compatible client (Claude, or other LLM with MCP support)","Network access to NebulaBlock API endpoints"],"input_types":["query parameters (addresses, transaction hashes, block numbers, contract addresses)","filter criteria (time ranges, transaction types, token symbols)"],"output_types":["structured JSON (transaction details, account balances, contract state)","formatted text summaries of blockchain data"],"categories":["tool-use-integration","blockchain-data"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-nebula-block-data-nebulablock-mcp-server__cap_1","uri":"capability://tool.use.integration.mcp.server.initialization.and.tool.registration","name":"mcp-server-initialization-and-tool-registration","description":"Implements MCP server bootstrap logic that discovers, validates, and registers NebulaBlock API endpoints as callable tools at startup. Uses fastmcp's decorator-based tool registration pattern to map API methods to MCP tool schemas with automatic parameter validation, type coercion, and error handling, enabling seamless client connection without manual schema definition.","intents":["I want to spin up an MCP server that exposes blockchain APIs without writing boilerplate tool definitions","I need to ensure all NebulaBlock endpoints are automatically discoverable and properly typed for LLM clients","I want to handle tool registration, validation, and error responses consistently across all blockchain queries"],"best_for":["DevOps engineers deploying MCP servers for LLM integrations","Backend teams building LLM-accessible data layers","Developers extending NebulaBlock's API surface for AI applications"],"limitations":["Tool registration is static at server startup — dynamic endpoint discovery requires server restart","No built-in versioning for tool schemas — API changes may break client expectations without explicit migration","fastmcp's decorator pattern requires Python code changes to add new tools; no configuration-driven tool definition","Error handling delegates to fastmcp's default behavior — custom error recovery logic requires subclassing"],"requires":["Python 3.8+","fastmcp library (version compatible with MCP spec)","NebulaBlock API endpoint URLs and authentication credentials","MCP client implementation (e.g., Claude desktop app, custom MCP client)"],"input_types":["Python function definitions with type hints","NebulaBlock API endpoint specifications","Authentication configuration (API keys, tokens)"],"output_types":["MCP tool schema definitions (JSON)","Tool registry with callable endpoints","Server initialization logs and diagnostics"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-nebula-block-data-nebulablock-mcp-server__cap_2","uri":"capability://safety.moderation.api.credential.and.context.isolation","name":"api-credential-and-context-isolation","description":"Manages NebulaBlock API credentials and request context on the server side, preventing credential exposure to LLM clients or context windows. Credentials are stored server-side and injected into API requests transparently, ensuring LLMs interact with blockchain data without handling sensitive authentication material or making direct API calls.","intents":["I want Claude to query blockchain data without exposing my NebulaBlock API keys","I need to ensure API credentials never appear in LLM context or logs","I want to control and audit all blockchain API calls made on behalf of LLM agents"],"best_for":["Security-conscious teams deploying LLM agents with external API access","Organizations with strict credential management policies","Multi-tenant systems where different users/agents need isolated API quotas"],"limitations":["Credentials must be pre-configured on the server — no dynamic credential injection from LLM requests","No built-in credential rotation or expiration handling — requires external secret management integration","All API calls share the same credential set — no per-request credential selection or scoping","Audit logging is server-side only — LLM clients have no visibility into which credentials were used"],"requires":["Secure credential storage mechanism (environment variables, secrets manager, or config file with restricted permissions)","MCP server running in a trusted environment with network isolation","NebulaBlock API credentials (API key or authentication token)"],"input_types":["API credentials (API keys, tokens, authentication headers)","Server configuration (credential storage location, injection method)"],"output_types":["Authenticated API responses from NebulaBlock","Audit logs of API calls (server-side only)"],"categories":["safety-moderation","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-nebula-block-data-nebulablock-mcp-server__cap_3","uri":"capability://tool.use.integration.fastmcp.protocol.translation.and.error.handling","name":"fastmcp-protocol-translation-and-error-handling","description":"Translates between MCP protocol messages and NebulaBlock API calls, handling serialization, deserialization, and error mapping. Converts LLM tool invocations (MCP CallTool requests) into properly formatted NebulaBlock API requests, then maps API responses and errors back to MCP-compliant formats with structured error messages, timeouts, and retry logic.","intents":["I want blockchain API errors to be clearly communicated back to Claude without breaking the MCP protocol","I need to handle API timeouts and rate limits gracefully without crashing the MCP server","I want to ensure all NebulaBlock responses are properly formatted for LLM consumption"],"best_for":["Teams building production MCP servers with external API dependencies","Developers handling unreliable or rate-limited APIs through LLM agents","Systems requiring robust error recovery and user-friendly error messages"],"limitations":["Error handling is limited to fastmcp's built-in error types — custom error semantics require wrapper logic","No automatic retry logic for transient failures — requires explicit implementation per tool","Timeout handling depends on underlying HTTP client configuration — may not align with MCP client expectations","Large API responses may exceed MCP message size limits — no built-in streaming or pagination"],"requires":["fastmcp library with error handling support","HTTP client library (requests, httpx, or similar) configured with timeout and retry policies","NebulaBlock API error documentation to map error codes to user-friendly messages"],"input_types":["MCP CallTool requests with tool name and parameters","NebulaBlock API responses (JSON, HTTP status codes, error messages)"],"output_types":["MCP CallToolResult with tool output or error","Structured error messages with error codes and descriptions"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-nebula-block-data-nebulablock-mcp-server__cap_4","uri":"capability://tool.use.integration.multi.blockchain.data.aggregation.via.tools","name":"multi-blockchain-data-aggregation-via-tools","description":"Provides tools for querying and aggregating data across multiple blockchain networks or NebulaBlock data sources through a unified MCP interface. Enables LLMs to invoke separate tools for different chains (Ethereum, Polygon, etc.) and correlate results, with each tool maintaining its own API endpoint and credential context but sharing the same MCP protocol surface.","intents":["I want Claude to compare token balances across multiple blockchains in a single analysis","I need an agent that can query different chains and synthesize cross-chain insights","I want to expose multiple NebulaBlock data sources as a cohesive tool set without duplicating integration logic"],"best_for":["DeFi teams analyzing cross-chain liquidity and arbitrage opportunities","Researchers comparing blockchain metrics across networks","Multi-chain applications requiring unified data access through LLM agents"],"limitations":["No built-in data consistency guarantees across chains — results may reflect different block heights or timestamps","Tool invocation latency multiplies with chain count — querying 5 chains requires 5 sequential or parallel API calls","No automatic correlation or join logic — LLM must reason about how to combine results from different chains","Rate limits are per-chain — aggregate queries may hit limits faster than single-chain queries"],"requires":["NebulaBlock API credentials for each blockchain network","Separate tool definitions for each chain (or parameterized tools with chain selection)","MCP client capable of handling multiple tool invocations in sequence or parallel"],"input_types":["Chain identifiers (Ethereum, Polygon, Arbitrum, etc.)","Query parameters specific to each chain (addresses, contract addresses, block ranges)"],"output_types":["Per-chain query results (balances, transactions, contract state)","Aggregated or correlated data across chains"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-nebula-block-data-nebulablock-mcp-server__cap_5","uri":"capability://tool.use.integration.real.time.blockchain.event.streaming.via.tools","name":"real-time-blockchain-event-streaming-via-tools","description":"Exposes NebulaBlock's event or subscription APIs as MCP tools that allow LLMs to request real-time blockchain data (new transactions, contract events, price updates). Tools may return streaming data or poll-based updates, with fastmcp handling the transport of event data back to the LLM client through MCP's message protocol.","intents":["I want Claude to monitor blockchain events and alert me when specific conditions occur","I need an agent that can react to real-time on-chain data (e.g., large transfers, price movements)","I want to stream blockchain events to Claude for live analysis and decision-making"],"best_for":["Trading and monitoring systems requiring real-time blockchain insights","Alert systems that need LLM reasoning on live on-chain events","Agents that must respond to blockchain state changes in near real-time"],"limitations":["MCP protocol is request-response based — true server-push streaming requires polling or WebSocket extensions","Event latency depends on NebulaBlock's indexing speed — may lag actual blockchain by seconds to minutes","No built-in event filtering on the server — all events must be transmitted to the client for LLM filtering","Streaming state management is client-side — LLM context may grow unbounded if events are not pruned"],"requires":["NebulaBlock API with event/subscription endpoints (WebSocket, Server-Sent Events, or polling)","MCP client with support for long-running or streaming tool calls","Event schema definitions for NebulaBlock's event types"],"input_types":["Event filters (contract addresses, event types, block ranges)","Subscription parameters (polling interval, buffer size, timeout)"],"output_types":["Real-time event data (transaction hashes, event logs, state changes)","Streaming or batched event updates"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-nebula-block-data-nebulablock-mcp-server__cap_6","uri":"capability://tool.use.integration.schema.driven.tool.parameter.validation","name":"schema-driven-tool-parameter-validation","description":"Automatically generates and enforces MCP tool schemas from NebulaBlock API specifications, validating LLM-provided parameters against expected types, ranges, and formats before invoking the API. Uses fastmcp's schema generation to create JSON schemas for each tool, with runtime validation that rejects invalid parameters and provides structured error feedback to the LLM.","intents":["I want Claude to automatically validate its own tool parameters before making API calls","I need to prevent invalid blockchain queries (e.g., malformed addresses) from reaching the API","I want clear error messages when Claude provides incorrect parameters so it can self-correct"],"best_for":["Teams reducing API errors and wasted quota from invalid LLM-generated requests","Systems requiring strict input validation before external API calls","Developers building LLM agents that must handle parameter validation feedback"],"limitations":["Schema generation is limited to fastmcp's type inference — complex nested types may require manual schema definition","Validation errors are returned to the LLM as tool errors — no guarantee the LLM will correct and retry","No semantic validation (e.g., 'is this a valid Ethereum address?') — only type and format checking","Schema changes require server restart — no hot-reload for updated parameter definitions"],"requires":["fastmcp library with schema generation support","Type hints on NebulaBlock API wrapper functions (Python type annotations)","JSON Schema validator library (jsonschema or similar)"],"input_types":["Python function signatures with type hints","NebulaBlock API parameter specifications"],"output_types":["MCP tool schemas (JSON Schema format)","Validation error messages with parameter details"],"categories":["tool-use-integration","safety-moderation"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-nebula-block-data-nebulablock-mcp-server__cap_7","uri":"capability://automation.workflow.rate.limit.and.quota.management.per.tool","name":"rate-limit-and-quota-management-per-tool","description":"Implements per-tool rate limiting and quota tracking for NebulaBlock API calls, tracking invocation counts and enforcing limits to prevent quota exhaustion. Maintains request counters per tool and returns rate-limit status to the LLM client, allowing agents to throttle or defer requests when approaching limits.","intents":["I want to prevent Claude from exhausting my NebulaBlock API quota with too many queries","I need to track which tools are consuming the most quota and adjust limits accordingly","I want Claude to be aware of rate limits and make intelligent decisions about when to query"],"best_for":["Teams with limited NebulaBlock API quotas running long-lived LLM agents","Multi-tenant systems allocating per-user or per-agent API budgets","Cost-sensitive deployments requiring strict API usage control"],"limitations":["Rate limiting is per-server instance — distributed servers require shared state (Redis, database) for global limits","No built-in quota allocation or priority queuing — all tools share the same limit pool","LLM clients receive rate-limit status but have no standard way to defer requests — retry logic is client-specific","Quota resets are time-based — no support for usage-based or event-driven quota adjustments"],"requires":["In-memory or distributed rate-limit tracking (dict, Redis, or similar)","NebulaBlock API quota information (requests per minute, daily limits, etc.)","Mechanism to communicate rate-limit status to LLM clients (tool error responses or metadata)"],"input_types":["Tool invocation requests","Rate-limit configuration (requests per time window, quota thresholds)"],"output_types":["Rate-limit status (remaining quota, reset time)","Rate-limit exceeded errors with backoff recommendations"],"categories":["automation-workflow","safety-moderation"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":29,"verified":false,"data_access_risk":"high","permissions":["NebulaBlock API credentials (API key or authentication token)","fastmcp library installed and configured","MCP-compatible client (Claude, or other LLM with MCP support)","Network access to NebulaBlock API endpoints","Python 3.8+","fastmcp library (version compatible with MCP spec)","NebulaBlock API endpoint URLs and authentication credentials","MCP client implementation (e.g., Claude desktop app, custom MCP client)","Secure credential storage mechanism (environment variables, secrets manager, or config file with restricted permissions)","MCP server running in a trusted environment with network isolation"],"failure_modes":["Dependent on NebulaBlock API availability and rate limits — no local caching or fallback mechanisms","MCP tool invocation adds latency for each blockchain query (network round-trip + API processing)","Limited to NebulaBlock's data schema — cannot query arbitrary blockchain sources without additional adapters","No built-in pagination abstraction — large result sets may require multiple tool calls or truncation","Tool registration is static at server startup — dynamic endpoint discovery requires server restart","No built-in versioning for tool schemas — API changes may break client expectations without explicit migration","fastmcp's decorator pattern requires Python code changes to add new tools; no configuration-driven tool definition","Error handling delegates to fastmcp's default behavior — custom error recovery logic requires subclassing","Credentials must be pre-configured on the server — no dynamic credential injection from LLM requests","No built-in credential rotation or expiration handling — requires external secret management integration","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.05,"quality":0.41,"ecosystem":0.39999999999999997,"match_graph":0.25,"freshness":0.52,"weights":{"adoption":0.25,"quality":0.25,"ecosystem":0.15,"match_graph":0.23,"freshness":0.12}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-06-17T09:51:03.579Z","last_scraped_at":"2026-05-03T14:00:15.503Z","last_commit":null},"community":{"stars":null,"forks":null,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=nebula-block-data-nebulablock-mcp-server","compare_url":"https://unfragile.ai/compare?artifact=nebula-block-data-nebulablock-mcp-server"}},"signature":"1S4f3VdDUqmTHUqeHqpbw58Bw8N3YDGp7d8AdNMNUvthYP0jqfoKjKaZUkBEp1FRmWCLEd/owZpfhnupCbFCDw==","signedAt":"2026-06-22T00:16:53.784Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/nebula-block-data-nebulablock-mcp-server","artifact":"https://unfragile.ai/nebula-block-data-nebulablock-mcp-server","verify":"https://unfragile.ai/api/v1/verify?slug=nebula-block-data-nebulablock-mcp-server","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}