Moralis MCP Server

Instructions

Implementation Reference

• src/utils/execute-api-tool.ts:34-252 (handler)

  Universal handler for all extracted OpenAPI tools. For 'evm_gethottestnftcollectionsbytradingvolume', it validates input, builds HTTP request to Moralis EVM API endpoint corresponding to the operationId, adds API key auth, executes via Axios, and returns formatted JSON response.
  export async function executeApiTool( toolName: string, definition: McpToolDefinition, toolArgs: JsonObject, allSecuritySchemes: Record<string, any>, token?: string, ): Promise<CallToolResult> { try { // Validate arguments against the input schema let validatedArgs: JsonObject; try { const zodSchema = getZodSchemaFromJsonSchema( definition.inputSchema, toolName, ); const argsToParse = typeof toolArgs === 'object' && toolArgs !== null ? toolArgs : {}; validatedArgs = zodSchema.parse(argsToParse); } catch (error: unknown) { if (error instanceof ZodError) { const validationErrorMessage = `Invalid arguments for tool '${toolName}': ${error.errors.map((e) => `${e.path.join('.')} (${e.code}): ${e.message}`).join(', ')}`; return { content: [{ type: 'text', text: validationErrorMessage }] }; } else { const errorMessage = error instanceof Error ? error.message : String(error); return { content: [ { type: 'text', text: `Internal error during validation setup: ${errorMessage}`, }, ], }; } } // Prepare URL, query parameters, headers, and request body let urlPath = definition.pathTemplate; const queryParams: Record<string, any> = {}; const headers: Record<string, string> = { Accept: 'application/json', 'X-Moralis-Platform': 'MCP', }; let requestBodyData: any = undefined; // Apply parameters to the URL path, query, or headers definition.executionParameters.forEach((param) => { const value = validatedArgs[param.name]; if (typeof value !== 'undefined' && value !== null) { if (param.in === 'path') { urlPath = urlPath.replace( `{${param.name}}`, encodeURIComponent(String(value)), ); } else if (param.in === 'query') { queryParams[param.name] = value; } else if (param.in === 'header') { headers[param.name.toLowerCase()] = String(value); } } }); // Ensure all path parameters are resolved if (urlPath.includes('{')) { throw new Error(`Failed to resolve path parameters: ${urlPath}`); } // Construct the full URL const requestUrl = `${definition.baseUrl}${urlPath}`; // Handle request body if needed if ( definition.requestBodyContentType && typeof validatedArgs['requestBody'] !== 'undefined' ) { requestBodyData = validatedArgs['requestBody']; headers['content-type'] = definition.requestBodyContentType; } // Apply security requirements if available // Security requirements use OR between array items and AND within each object const appliedSecurity = definition.securityRequirements?.find((req) => { // Try each security requirement (combined with OR) return Object.entries(req).every(([schemeName, scopesArray]) => { const scheme = allSecuritySchemes[schemeName]; if (!scheme) return false; // API Key security (header, query, cookie) if (scheme.type === 'apiKey') { return !!token || !!Config.MORALIS_API_KEY; } return false; }); }); // If we found matching security scheme(s), apply them if (appliedSecurity) { // Apply each security scheme from this requirement (combined with AND) for (const [schemeName, scopesArray] of Object.entries(appliedSecurity)) { const scheme = allSecuritySchemes[schemeName]; // API Key security if (scheme?.type === 'apiKey') { const apiKey = token || Config.MORALIS_API_KEY; if (apiKey) { if (scheme.in === 'header') { headers[scheme.name.toLowerCase()] = apiKey; console.error( `Applied API key '${schemeName}' in header '${scheme.name}'`, ); } } } } } // Log warning if security is required but not available else if (definition.securityRequirements?.length > 0) { // First generate a more readable representation of the security requirements const securityRequirementsString = definition.securityRequirements .map((req) => { const parts = Object.entries(req) .map(([name, scopesArray]) => { const scopes = scopesArray as string[]; if (scopes.length === 0) return name; return `${name} (scopes: ${scopes.join(', ')})`; }) .join(' AND '); return `[${parts}]`; }) .join(' OR '); console.warn( `Tool '${toolName}' requires security: ${securityRequirementsString}, but no suitable credentials found.`, ); } // Prepare the axios request configuration const config: AxiosRequestConfig = { method: definition.method.toUpperCase(), url: requestUrl, params: queryParams, headers: headers, ...(requestBodyData !== undefined && { data: requestBodyData }), }; // Log request info to stderr (doesn't affect MCP output) console.error( `Executing tool "${toolName}": ${config.method} ${config.url}`, ); // Execute the request const response = await axios(config); // Process and format the response let responseText = ''; const contentType = response.headers['content-type']?.toLowerCase() || ''; // Handle JSON responses if ( contentType.includes('application/json') && typeof response.data === 'object' && response.data !== null ) { try { responseText = JSON.stringify(response.data, null, 2); } catch (e) { responseText = '[Stringify Error]'; } } // Handle string responses else if (typeof response.data === 'string') { responseText = response.data; } // Handle other response types else if (response.data !== undefined && response.data !== null) { responseText = String(response.data); } // Handle empty responses else { responseText = `(Status: ${response.status} - No body content)`; } // Return formatted response return { content: [ { type: 'text', text: `API Response (Status: ${response.status}):\n${responseText}`, }, ], }; } catch (error: unknown) { // Handle errors during execution let errorMessage: string; // Format Axios errors specially if (axios.isAxiosError(error)) { errorMessage = formatApiError(error); } // Handle standard errors else if (error instanceof Error) { errorMessage = error.message; } // Handle unexpected error types else { errorMessage = `Unexpected error: ${String(error)}`; } // Log error to stderr console.error( `Error during execution of tool '${toolName}':`, errorMessage, ); // Return error message to client return { content: [{ type: 'text', text: errorMessage }] }; } }
• src/server.ts:96-120 (registration)

  MCP server request handler for calling any tool by name. Looks up the tool definition from the map (populated with 'evm_' prefixed tools from Moralis spec) and invokes the generic executeApiTool handler.
  server.setRequestHandler( CallToolRequestSchema, async (request: CallToolRequest, c): Promise<CallToolResult> => { const { name: toolName, arguments: toolArgs } = request.params; const toolDefinition = toolDefinitionMap[toolName]; if (!toolDefinition) { console.error(`Error: Unknown tool requested: ${toolName}`); return { content: [ { type: 'text', text: `Error: Unknown tool requested: ${toolName}`, }, ], }; } return executeApiTool( toolName, toolDefinition, toolArgs ?? {}, securitySchemes, c.authInfo?.token, ); }, );
• src/server.ts:66-72 (registration)

  Merges tool definitions from EVM and Solana configs into a single map used by listTools and callTool handlers. Includes all 'evm_*' tools extracted from Moralis OpenAPI spec.
  let toolDefinitionMap: Record<string, McpToolDefinition> = {}; for (const config of configArray) toolDefinitionMap = { ...toolDefinitionMap, ...(await mapToolDefinitions(config)), };
• src/parser/extract-tools.ts:101-180 (schema)

  Generates the inputSchema for each tool from the OpenAPI operation's parameters and requestBody. Used during tool extraction to define validation schema for 'evm_gethottestnftcollectionsbytradingvolume' inputs.
  export function generateInputSchemaAndDetails( operation: OpenAPIV3.OperationObject, ): { inputSchema: JSONSchema7 | boolean; parameters: OpenAPIV3.ParameterObject[]; requestBodyContentType?: string; } { const properties: { [key: string]: JSONSchema7 | boolean } = {}; const required: string[] = []; // Process parameters const allParameters: OpenAPIV3.ParameterObject[] = Array.isArray( operation.parameters, ) ? operation.parameters.map((p) => p as OpenAPIV3.ParameterObject) : []; allParameters.forEach((param) => { if (!param.name || !param.schema) return; const paramSchema = mapOpenApiSchemaToJsonSchema( param.schema as OpenAPIV3.SchemaObject, ); if (typeof paramSchema === 'object') { paramSchema.description = param.description || paramSchema.description; } properties[param.name] = paramSchema; if (param.required) required.push(param.name); }); // Process request body (if present) let requestBodyContentType: string | undefined = undefined; if (operation.requestBody) { const opRequestBody = operation.requestBody as OpenAPIV3.RequestBodyObject; const jsonContent = opRequestBody.content?.['application/json']; const firstContent = opRequestBody.content ? Object.entries(opRequestBody.content)[0] : undefined; if (jsonContent?.schema) { requestBodyContentType = 'application/json'; const bodySchema = mapOpenApiSchemaToJsonSchema( jsonContent.schema as OpenAPIV3.SchemaObject, ); if (typeof bodySchema === 'object') { bodySchema.description = opRequestBody.description || bodySchema.description || 'The JSON request body.'; } properties['requestBody'] = bodySchema; if (opRequestBody.required) required.push('requestBody'); } else if (firstContent) { const [contentType] = firstContent; requestBodyContentType = contentType; properties['requestBody'] = { type: 'string', description: opRequestBody.description || `Request body (content type: ${contentType})`, }; if (opRequestBody.required) required.push('requestBody'); } } // Combine everything into a JSON Schema const inputSchema: JSONSchema7 = { type: 'object', properties, ...(required.length > 0 && { required }), }; return { inputSchema, parameters: allParameters, requestBodyContentType }; }
• src/parser/extract-tools.ts:17-93 (helper)

  Core function that extracts all MCP tools from OpenAPI document. Sanitizes operationIds to lowercase snake_case, prefixes with 'evm_', generates input schemas, used to create definition for the target tool.
  export function extractToolsFromApi( api: OpenAPIV3DocumentX, prefix?: string ): McpToolDefinition[] { const tools: McpToolDefinition[] = []; const usedNames = new Set<string>(); const globalSecurity = api.security || []; if (!api.paths) return tools; for (const [path, pathItem] of Object.entries(api.paths)) { if (!pathItem) continue; for (const method of Object.values(OpenAPIV3.HttpMethods)) { const operation = pathItem[method]; if (!operation) continue; // Generate a unique name for the tool let baseName = operation.operationId || generateOperationId(method, path); if (!baseName) continue; // Sanitize the name to be MCP-compatible (only a-z, 0-9, _, -) baseName = baseName .replace(/\./g, '_') .replace(/[^a-z0-9_-]/gi, '_') .toLowerCase(); let finalToolName = baseName; let counter = 1; while (usedNames.has(finalToolName)) { finalToolName = `${baseName}_${counter++}`; } usedNames.add(finalToolName); // Get or create a description const description = operation.description || operation.summary || `Executes ${method.toUpperCase()} ${path}`; const prompt = operation['x-mcp-prompt']; // Generate input schema and extract parameters const { inputSchema, parameters, requestBodyContentType } = generateInputSchemaAndDetails(operation); // Extract parameter details for execution const executionParameters = parameters.map((p) => ({ name: p.name, in: p.in, })); // Determine security requirements const securityRequirements = operation.security === null ? globalSecurity : operation.security || globalSecurity; // Create the tool definition tools.push({ name: prefix + finalToolName, description, inputSchema, method, pathTemplate: path, parameters, executionParameters, requestBodyContentType, securityRequirements, operationId: baseName, prompt, }); } } return tools; }